{"id":32,"date":"2019-07-23T20:37:55","date_gmt":"2019-07-24T00:37:55","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/inorganicchemistrychem250\/chapter\/chemistry-in-context\/"},"modified":"2021-07-08T23:04:49","modified_gmt":"2021-07-09T03:04:49","slug":"chemistry-in-our-lives","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/inorganicchemistrychem250\/chapter\/chemistry-in-our-lives\/","title":{"raw":"1.1 Introduction - Chemistry in our lives","rendered":"1.1 Introduction &#8211; Chemistry in our lives"},"content":{"raw":"[latexpage]\r\n<div class=\"textbox textbox--learning-objectives\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Learning Objectives<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n\r\nBy the end of this module, you will be able to:\r\n<ul>\r\n \t<li>Outline the historical development of chemistry<\/li>\r\n \t<li>Provide examples of the importance of chemistry in everyday life<\/li>\r\n \t<li>Describe the scientific method<\/li>\r\n \t<li>Differentiate among hypotheses, theories, and laws<\/li>\r\n \t<li>Provide examples illustrating macroscopic, microscopic, and symbolic domains<\/li>\r\n<\/ul>\r\n<\/div>\r\n<\/div>\r\nThroughout human history, people have tried to convert matter into more useful forms. Our Stone Age ancestors chipped pieces of flint into useful tools and carved wood into statues and toys. These endeavors involved changing the shape of a substance without changing the substance itself. But as our knowledge increased, humans began to change the composition of the substances as well\u2014clay was converted into pottery, hides were cured to make garments, copper ores were transformed into copper tools and weapons, and grain was made into bread.\r\n\r\nHumans began to practice chemistry when they learned to control fire and use it to cook, make pottery, and smelt metals. Subsequently, they began to separate and use specific components of matter. A variety of drugs such as aloe, myrrh, and opium were isolated from plants. Dyes, such as indigo and Tyrian purple, were extracted from plant and animal matter. Metals were combined to form alloys\u2014for example, copper and tin were mixed together to make bronze\u2014and more elaborate smelting techniques produced iron. Alkalis were extracted from ashes, and soaps were prepared by combining these alkalis with fats. Alcohol was produced by fermentation and purified by distillation.\r\n\r\nAttempts to understand the behavior of matter extend back for more than 2500 years. As early as the sixth century BC, Greek philosophers discussed a system in which water was the basis of all things. You may have heard of the Greek postulate that matter consists of four elements: earth, air, fire, and water. Subsequently, an amalgamation of chemical technologies and philosophical speculations was spread from Egypt, China, and the eastern Mediterranean by alchemists, who endeavored to transform \u201cbase metals\u201d such as lead into \u201cnoble metals\u201d like gold, and to create elixirs to cure disease and extend life (<a href=\"#CNX_Chem_01_01_Alchemist\">Figure 1.1.1<\/a>).\r\n\r\n&nbsp;\r\n<div id=\"CNX_Chem_01_01_Alchemist\" class=\"scaled-down\">\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"975\"]<img src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2019\/07\/CNX_Chem_01_01_Alchemist-1.jpg\" alt=\"A sketch depicts 4 people stirring and handling chemicals. The chemicals are held in a variety of barrels and large cylinders. Several of the containers are being heated over burning embers. A large stove in the laboratory is filled with burning embers. There is also a large chest in the corner that is producing steam.\" width=\"975\" height=\"692\" data-media-type=\"image\/jpeg\" \/> <strong>Figure 1.1.1 - This portrayal shows an alchemist\u2019s workshop circa 1580. Although alchemy made some useful contributions to how to manipulate matter, it was not scientific by modern standards. (credit: Chemical Heritage Foundation)<\/strong>[\/caption]\r\n\r\nFrom alchemy came the historical progressions that led to modern chemistry: the isolation of drugs from natural sources, metallurgy, and the dye industry. Today, chemistry continues to deepen our understanding and improve our ability to harness and control the behavior of matter.\r\n<h2>Chemistry: The Central Science<\/h2>\r\nChemistry is sometimes referred to as \u201cthe central science\u201d due to its interconnectedness with a vast array of other STEM disciplines (STEM stands for areas of study in the science, technology, engineering, and math fields). Chemistry and the language of chemists play vital roles in biology, medicine, materials science, forensics, environmental science, and many other fields (<a href=\"#Fig1.1.2\">Figure 1.1.2<\/a>). The basic principles of physics are essential for understanding many aspects of chemistry, and there is extensive overlap between many subdisciplines within the two fields, such as chemical physics and nuclear chemistry. Mathematics, computer science, and information theory provide important tools that help us calculate, interpret, describe, and generally make sense of the chemical world. Biology and chemistry converge in biochemistry, which is crucial to understanding the many complex factors and processes that keep living organisms (such as us) alive. Chemical engineering, materials science, and nanotechnology combine chemical principles and empirical findings to produce useful substances, ranging from gasoline to fabrics to electronics. Agriculture, food science, veterinary science, and brewing and wine making help provide sustenance in the form of food and drink to the world\u2019s population. Medicine, pharmacology, biotechnology, and botany identify and produce substances that help keep us healthy. Environmental science, geology, oceanography, and atmospheric science incorporate many chemical ideas to help us better understand and protect our physical world. Chemical ideas are used to help understand the universe in astronomy and cosmology.\r\n\r\nKnowledge of chemistry is central to understanding a wide range of scientific disciplines.\r\n\r\n&nbsp;\r\n<div id=\"Fig1.1.2\" class=\"scaled-down\">\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"1300\"]<img src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2020\/04\/CNX_Chem_01_01_ChemWeb-1.jpg\" alt=\"A flowchart shows a box containing chemistry at its center. Chemistry is connected to geochemistry, nuclear chemistry, chemical physics, nanoscience and nanotechnology, materials science, chemical engineering, biochemistry and molecular biology, environmental science, agriculture, and mathematics. Each of these disciplines is further connected to other related fields including medicine, biology, food science, geology earth sciences, toxicology, physics, and computer science.\" width=\"1300\" height=\"564\" data-media-type=\"image\/jpeg\" \/> <strong>Figure 1.1.2 - This diagram shows just some of the interrelationships between chemistry and other fields.<\/strong>[\/caption]\r\n\r\nWhat are some changes in matter that are essential to daily life? Digesting and assimilating food, synthesizing polymers that are used to make clothing, containers, cookware, and credit cards, and refining crude oil into gasoline and other products are just a few examples. As you proceed through this course, you will discover many different examples of changes in the composition and structure of matter, how to classify these changes and how they occurred, their causes, the changes in energy that accompany them, and the principles and laws involved. As you learn about these things, you will be learning chemistry, the study of the composition, properties, and interactions of matter. The practice of chemistry is not limited to chemistry books or laboratories: It happens whenever someone is involved in changes in matter or in conditions that may lead to such changes.\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"1300\"]<img src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2019\/07\/CNX_Chem_03_00_Pool-1.jpg\" alt=\"This figure shows a swimming pool that is full of water and surrounded by a concrete patio.\" width=\"1300\" height=\"600\" data-media-type=\"image\/jpeg\" \/> <strong>Figure 1.1.3 - The water in a swimming pool is a complex mixture of substances whose relative amounts must be carefully maintained to ensure the health and comfort of people using the pool. (credit: modification of work by Vic Brincat)<\/strong>[\/caption]\r\n\r\nSwimming pools have long been a popular means of recreation, exercise, and physical therapy. Since it is impractical to refill large pools with fresh water on a frequent basis, pool water is regularly treated with chemicals to prevent the growth of harmful bacteria and algae. Proper pool maintenance requires regular additions of various chemical compounds in carefully measured amounts. For example, the relative amount of calcium ion, Ca<sup>2+<\/sup>, in the water should be maintained within certain limits to prevent eye irritation and avoid damage to the pool bed and plumbing. To maintain proper calcium levels, calcium cations are added to the water in the form of an ionic compound that also contains anions; thus, it is necessary to know both the relative amount of Ca<sup>2+<\/sup> in the compound and the volume of water in the pool in order to achieve the proper calcium level. Quantitative aspects of the composition of substances (such as the calcium-containing compound) and mixtures (such as the pool water) are the subject of this chapter.\r\n\r\n&nbsp;\r\n<div id=\"CNX_Chem_02_00_Biomarkers\" class=\"splash\">\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"1300\"]<img src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2019\/07\/CNX_Chem_02_00_Biomarkers-1.jpg\" alt=\"A person is shown blowing into a tube connected to a plastic bag. There is a computer screen displaying data that reads \u201cMass Spectral Breath Analysis.\u201d An arrow from the plastic bag points to an illustration of different molecular compounds contained in the person\u2019s exhalation\" width=\"1300\" height=\"600\" data-media-type=\"image\/jpeg\" \/> <strong>Figure 1.1.4 - Analysis of molecules in an exhaled breath can provide valuable information, leading to early diagnosis of diseases or detection of environmental exposure to harmful substances. (credit: modification of work by Paul Flowers)<\/strong>[\/caption]\r\n\r\n<\/div>\r\nYour overall health and susceptibility to disease depends upon the complex interaction between your genetic makeup and environmental exposure, with the outcome difficult to predict. Early detection of biomarkers, substances that indicate an organism\u2019s disease or physiological state, could allow diagnosis and treatment before a condition becomes serious or irreversible. Recent studies have shown that your exhaled breath can contain molecules that may be biomarkers for recent exposure to environmental contaminants or for pathological conditions ranging from asthma to lung cancer. Scientists are working to develop biomarker \u201cfingerprints\u201d that could be used to diagnose a specific disease based on the amounts and identities of certain molecules in a patient\u2019s exhaled breath. An essential concept underlying this goal is that of a molecule\u2019s identity, which is determined by the numbers and types of atoms it contains, and how they are bonded together. This chapter will describe some of the fundamental chemical principles related to the composition of matter, including those central to the concept of molecular identity.\r\n<h2>The Scientific Method<\/h2>\r\nChemistry is a science based on observation and experimentation. Doing chemistry involves attempting to answer questions and explain observations in terms of the laws and theories of chemistry, using procedures that are accepted by the scientific community. There is no single route to answering a question or explaining an observation, but there is an aspect common to every approach: Each uses knowledge based on experiments that can be reproduced to verify the results. Some routes involve a hypothesis, a tentative explanation of observations that acts as a guide for gathering and checking information. A hypothesis is tested by experimentation, calculation, and\/or comparison with the experiments of others and then refined as needed.\r\n\r\nSome hypotheses are attempts to explain the behavior that is summarized in laws. The laws of science summarize a vast number of experimental observations, and describe or predict some facet of the natural world. If such a hypothesis turns out to be capable of explaining a large body of experimental data, it can reach the status of a theory. Scientific theories are well-substantiated, comprehensive, testable explanations of particular aspects of nature. Theories are accepted because they provide satisfactory explanations, but they can be modified if new data become available. The path of discovery that leads from question and observation to law or hypothesis to theory, combined with experimental verification of the hypothesis and any necessary modification of the theory, is called the scientific method (<a href=\"#1.1.5\">Figure 1.1.5<\/a>).\r\n\r\n&nbsp;\r\n<div id=\"1.1.5\" class=\"scaled-down\">\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"1300\"]<img src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2020\/04\/CNX_Chem_01_01_SciMethod-1.jpg\" alt=\"In this flowchart, the observation and curiosity box has an arrow pointing to a box labeled form hypothesis; make prediction. A curved arrow labeled next connects this box to a box labeled perform experiment; make more observations. Another arrow points back to the box that says form hypothesis; make prediction. This arrow is labeled results not consistent with prediction. Another arrow, labeled results are consistent with prediction points from the perform experiment box to a box labeled contributes to body of knowledge. However, an arrow also points from contributes to body of knowledge back to the form hypothesis; make prediction box. This arrow is labeled further testing does not support hypothesis. There are also two other arrows leading out from contributes to body of knowledge. One arrow is labeled much additional testing yields constant observations. This leads to the observation becomes law box. The other arrow is labeled much additional testing supports hypothesis. This arrow leads to the hypothesis becomes theory box.\" width=\"1300\" height=\"766\" data-media-type=\"image\/jpeg\" \/> <strong>Figure 1.1.5 - The scientific method follows a process similar to the one shown in this diagram. All the key components are shown, in roughly the right order. Scientific progress is seldom neat and clean: It requires open inquiry and the reworking of questions and ideas in response to findings.<\/strong>[\/caption]\r\n<h2>The Domains of Chemistry<\/h2>\r\nChemists study and describe the behavior of matter and energy in three different domains: macroscopic, microscopic, and symbolic. These domains provide different ways of considering and describing chemical behavior.\r\n\r\nMacro is a Greek word that means \u201clarge.\u201d The macroscopic domain is familiar to us: It is the realm of everyday things that are large enough to be sensed directly by human sight or touch. In daily life, this includes the food you eat and the breeze you feel on your face. The macroscopic domain includes everyday and laboratory chemistry, where we observe and measure physical and chemical properties such as density, solubility, and flammability.\r\n\r\nMicro comes from Greek and means \u201csmall.\u201d The microscopic domain of chemistry is often visited in the imagination. Some aspects of the microscopic domain are visible through standard optical microscopes, for example, many biological cells. More sophisticated instruments are capable of imaging even smaller entities such as molecules and atoms (see (Figure 1.1.6b)).\r\n\r\nHowever, most of the subjects in the microscopic domain of chemistry are too small to be seen even with the most advanced microscopes and may only be pictured in the mind. Other components of the microscopic domain include ions and electrons, protons and neutrons, and chemical bonds, each of which is far too small to see.\r\n\r\nThe symbolic domain contains the specialized language used to represent components of the macroscopic and microscopic domains. Chemical symbols (such as those used in the periodic table), chemical formulas, and chemical equations are part of the symbolic domain, as are graphs, drawings, and calculations. These symbols play an important role in chemistry because they help interpret the behavior of the macroscopic domain in terms of the components of the microscopic domain. One of the challenges for students learning chemistry is recognizing that the same symbols can represent different things in the macroscopic and microscopic domains, and one of the features that makes chemistry fascinating is the use of a domain that must be imagined to explain behavior in a domain that can be observed.\r\n\r\nA helpful way to understand the three domains is via the essential and ubiquitous substance of water. That water is a liquid at moderate temperatures, will freeze to form a solid at lower temperatures, and boil to form a gas at higher temperatures (<a href=\"#CNX_Chem_01_01_WaterDom\">Figure 1.1.6<\/a>) are macroscopic observations. But some properties of water fall into the microscopic domain\u2014what cannot be observed with the naked eye. The description of water as comprising two hydrogen atoms and one oxygen atom, and the explanation of freezing and boiling in terms of attractions between these molecules, is within the microscopic arena. The formula H<sub>2<\/sub>O, which can describe water at either the macroscopic or microscopic levels, is an example of the symbolic domain. The abbreviations (g) for gas, (s) for solid, and (l) for liquid are also symbolic.\r\n\r\n&nbsp;\r\n<div id=\"CNX_Chem_01_01_WaterDom\" class=\"bc-figure figure\">\r\n<div class=\"bc-figcaption figcaption\"><\/div>\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"1300\"]<img src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2020\/04\/CNX_Chem_01_01_WaterDom-1.jpg\" alt=\"Figure A shows a photo of an iceberg floating in a sea has three arrows. Each arrow points to figure B, which contains three diagrams showing how the water molecules are organized in the air, ice, and sea. In the air, which contains the gaseous form of water, H subscript 2 O gas, the water molecules are disconnected and widely spaced. In the ice, which is the solid form of water, H subscript 2 O solid, the water molecules are bonded together into rings, with each ring containing six water molecules. Three of these rings are connected to each other. In the sea, which is the liquid form of water, H subscript 2 O liquid, the water molecules are very densely packed. The molecules are not bonded together.\" width=\"1300\" height=\"720\" data-media-type=\"image\/jpeg\" \/> <strong>Figure 1.1.6 - (a) Moisture in the air, icebergs, and the ocean represent water in the macroscopic domain. (b) At the molecular level (microscopic domain), gas molecules are far apart and disorganized, solid water molecules are close together and organized, and liquid molecules are close together and disorganized. (c) The formula H2O symbolizes water, and (g), (s), and (l) symbolize its phases. Note that clouds actually comprise either very small liquid water droplets or solid water crystals; gaseous water in our atmosphere is not visible to the naked eye, although it may be sensed as humidity. (credit a: modification of work by \u201cGorkaazk\u201d\/Wikimedia Commons)<\/strong>[\/caption]\r\n\r\n<\/div>\r\n<h1>Key Concepts and Summary<\/h1>\r\nChemistry deals with the composition, structure, and properties of matter, and the ways by which various forms of matter may be interconverted. Thus, it occupies a central place in the study and practice of science and technology. Chemists use the scientific method to perform experiments, pose hypotheses, and formulate laws and develop theories, so that they can better understand the behaviour of the natural world. To do so, they operate in the macroscopic, microscopic, and symbolic domains. Chemists measure, analyze, purify, and synthesize a wide variety of substances that are important to our lives.\r\n<div id=\"fs-idp75215696\" class=\"exercises\" data-depth=\"1\">\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">End of Chapter Exercises<\/header>\r\n<div class=\"textbox__content\">\r\n<div id=\"fs-idm34987968\" data-type=\"exercise\">\r\n<div id=\"fs-idm4947040\" data-type=\"problem\">\r\n<ol start=\"1\">\r\n \t<li>Explain how you could experimentally determine whether the outside temperature is higher or lower than 0 \u00b0C (32 \u00b0F) without using a thermometer.<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div id=\"fs-idp19762080\" data-type=\"solution\">\r\n<p id=\"fs-idm53320912\" style=\"text-align: left;padding-left: 40px\"><strong><em>Solution<\/em><\/strong><\/p>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Place a glass of water outside. It will freeze if the temperature is below 0 \u00b0C.\r\n\r\n&nbsp;\r\n\r\n<\/div>\r\n<\/div>\r\n<div id=\"fs-idp45595424\" data-type=\"exercise\">\r\n<div id=\"fs-idp64708304\" data-type=\"problem\">\r\n<ol start=\"2\">\r\n \t<li>Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning.\r\n<ol class=\"Decimal\">\r\n \t<li>Falling barometric pressure precedes the onset of bad weather.<\/li>\r\n \t<li>All life on earth has evolved from a common, primitive organism through the process of natural selection.<\/li>\r\n \t<li>My truck\u2019s gas mileage has dropped significantly, probably because it\u2019s due for a tune-up<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n&nbsp;\r\n\r\n<\/div>\r\n<\/div>\r\n<div id=\"fs-idp38309200\" data-type=\"exercise\">\r\n<div id=\"fs-idp83503984\" data-type=\"problem\">\r\n<ol start=\"3\">\r\n \t<li>Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning.\r\n<ol class=\"Decimal\">\r\n \t<li>The pressure of a sample of gas is directly proportional to the temperature of the gas.<\/li>\r\n \t<li>Matter consists of tiny particles that can combine in specific ratios to form substances with specific properties.<\/li>\r\n \t<li>At a higher temperature, solids (such as salt or sugar) will dissolve better in water.<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n<p id=\"fs-idm53320912\" style=\"text-align: left;padding-left: 40px\"><strong><em>Solution<\/em><\/strong><\/p>\r\n<p style=\"text-align: left;padding-left: 40px\">(1) law (states a consistently observed phenomenon, can be used for prediction); (2) theory (a widely accepted explanation of the behavior of matter); (3) hypothesis (a tentative explanation, can be investigated by experimentation)<\/p>\r\n&nbsp;\r\n<ol start=\"4\">\r\n \t<li>Identify each of the underlined items as a part of either the macroscopic domain, the microscopic domain, or the symbolic domain of chemistry. For any in the symbolic domain, indicate whether they are symbols for a macroscopic or a microscopic feature.\r\n<ol class=\"Decimal\">\r\n \t<li>The mass of a <u data-effect=\"underline\">lead pipe<\/u> is 14 lb.<\/li>\r\n \t<li>The mass of a certain <u data-effect=\"underline\">chlorine atom<\/u> is 35 amu.<\/li>\r\n \t<li>A bottle with a label that reads <u data-effect=\"underline\">Al<\/u> contains aluminum metal.<\/li>\r\n \t<li><u data-effect=\"underline\">Al<\/u> is the symbol for an aluminum atom.<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n&nbsp;\r\n\r\n<\/div>\r\n<\/div>\r\n<div id=\"fs-idm67489232\" data-type=\"exercise\">\r\n<div id=\"fs-idp67411776\" data-type=\"problem\">\r\n<ol start=\"5\">\r\n \t<li>Identify each of the underlined items as a part of either the macroscopic domain, the microscopic domain, or the symbolic domain of chemistry. For those in the symbolic domain, indicate whether they are symbols for a macroscopic or a microscopic feature.\r\n<ol class=\"Decimal\">\r\n \t<li>A certain molecule contains one <u data-effect=\"underline\">H<\/u> atom and one Cl atom.<\/li>\r\n \t<li><u data-effect=\"underline\">Copper wire<\/u> has a density of about 8 g\/cm<sup>3<\/sup>.<\/li>\r\n \t<li>The bottle contains 15 grams of <u data-effect=\"underline\">Ni powder<\/u>.<\/li>\r\n \t<li>A <u data-effect=\"underline\">sulfur molecule<\/u> is composed of eight sulfur atoms.<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n<em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <strong>Solution<\/strong><\/em>\r\n<p style=\"padding-left: 40px\"><span style=\"text-align: initial;font-size: 1em\">(1) symbolic, microscopic; (2) macroscopic; (3) symbolic, macroscopic; (4) microscopic<\/span><\/p>\r\n\r\n<\/div>\r\n<div id=\"fs-idp31026272\" style=\"padding-left: 40px\" data-type=\"solution\">\r\n\r\n&nbsp;\r\n\r\n<\/div>\r\n<\/div>\r\n<div id=\"fs-idp6505632\" data-type=\"exercise\">\r\n<div id=\"fs-idm59649392\" data-type=\"problem\">\r\n<ol start=\"6\">\r\n \t<li>According to one theory, the pressure of a gas increases as its volume decreases because the molecules in the gas have to move a shorter distance to hit the walls of the container. Does this theory follow a macroscopic or microscopic description of chemical behavior? Explain your answer.<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div id=\"fs-idp40361152\" data-type=\"exercise\">\r\n<div id=\"fs-idp111357888\" data-type=\"problem\">\r\n<ol start=\"7\">\r\n \t<li>The amount of heat required to melt 2 lbs of ice is twice the amount of heat required to melt 1 lb of ice. Is this observation a macroscopic or microscopic description of chemical behavior? Explain your answer.<\/li>\r\n<\/ol>\r\n<em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <strong>Solution<\/strong><\/em>\r\n<p style=\"padding-left: 40px\"><span style=\"text-align: initial;font-size: 1em\">\u00a0Macroscopic. The heat required is determined from macroscopic properties.<\/span><\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox shaded\">\r\n<h2>Glossary<\/h2>\r\n<strong>[pb_glossary id=\"2706\"]chemistry[\/pb_glossary]<\/strong>\r\n\r\nstudy of the composition, properties, and interactions of matter\r\n\r\n<strong>[pb_glossary id=\"2707\"]hypothesis[\/pb_glossary]<\/strong>\r\n\r\ntentative explanation of observations that acts as a guide for gathering and checking information\r\n\r\n<strong>[pb_glossary id=\"2708\"]law[\/pb_glossary]<\/strong>\r\n\r\nstatement that summarizes a vast number of experimental observations, and describes or predicts some aspect of the natural world\r\n\r\n<strong>[pb_glossary id=\"2709\"]macroscopic domain[\/pb_glossary]<\/strong>\r\n\r\nrealm of everyday things that are large enough to sense directly by human sight and touch\r\n\r\n<strong>[pb_glossary id=\"2710\"]microscopic domain[\/pb_glossary]<\/strong>\r\n\r\nrealm of things that are much too small to be sensed directly\r\n\r\n<strong>[pb_glossary id=\"2711\"]scientific method[\/pb_glossary]<\/strong>\r\n\r\npath of discovery that leads from question and observation to law or hypothesis to theory, combined with experimental verification of the hypothesis and any necessary modification of the theory\r\n\r\n<strong>[pb_glossary id=\"2712\"]symbolic domain[\/pb_glossary]<\/strong>\r\n\r\nspecialized language used to represent components of the macroscopic and microscopic domains, such as chemical symbols, chemical formulas, chemical equations, graphs, drawings, and calculations\r\n\r\n<strong>[pb_glossary id=\"2713\"]theory[\/pb_glossary]<\/strong>\r\n\r\nwell-substantiated, comprehensive, testable explanation of a particular aspect of nature\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>","rendered":"<div class=\"textbox textbox--learning-objectives\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Learning Objectives<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<p>By the end of this module, you will be able to:<\/p>\n<ul>\n<li>Outline the historical development of chemistry<\/li>\n<li>Provide examples of the importance of chemistry in everyday life<\/li>\n<li>Describe the scientific method<\/li>\n<li>Differentiate among hypotheses, theories, and laws<\/li>\n<li>Provide examples illustrating macroscopic, microscopic, and symbolic domains<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>Throughout human history, people have tried to convert matter into more useful forms. Our Stone Age ancestors chipped pieces of flint into useful tools and carved wood into statues and toys. These endeavors involved changing the shape of a substance without changing the substance itself. But as our knowledge increased, humans began to change the composition of the substances as well\u2014clay was converted into pottery, hides were cured to make garments, copper ores were transformed into copper tools and weapons, and grain was made into bread.<\/p>\n<p>Humans began to practice chemistry when they learned to control fire and use it to cook, make pottery, and smelt metals. Subsequently, they began to separate and use specific components of matter. A variety of drugs such as aloe, myrrh, and opium were isolated from plants. Dyes, such as indigo and Tyrian purple, were extracted from plant and animal matter. Metals were combined to form alloys\u2014for example, copper and tin were mixed together to make bronze\u2014and more elaborate smelting techniques produced iron. Alkalis were extracted from ashes, and soaps were prepared by combining these alkalis with fats. Alcohol was produced by fermentation and purified by distillation.<\/p>\n<p>Attempts to understand the behavior of matter extend back for more than 2500 years. As early as the sixth century BC, Greek philosophers discussed a system in which water was the basis of all things. You may have heard of the Greek postulate that matter consists of four elements: earth, air, fire, and water. Subsequently, an amalgamation of chemical technologies and philosophical speculations was spread from Egypt, China, and the eastern Mediterranean by alchemists, who endeavored to transform \u201cbase metals\u201d such as lead into \u201cnoble metals\u201d like gold, and to create elixirs to cure disease and extend life (<a href=\"#CNX_Chem_01_01_Alchemist\">Figure 1.1.1<\/a>).<\/p>\n<p>&nbsp;<\/p>\n<div id=\"CNX_Chem_01_01_Alchemist\" class=\"scaled-down\">\n<figure style=\"width: 975px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2019\/07\/CNX_Chem_01_01_Alchemist-1.jpg\" alt=\"A sketch depicts 4 people stirring and handling chemicals. The chemicals are held in a variety of barrels and large cylinders. Several of the containers are being heated over burning embers. A large stove in the laboratory is filled with burning embers. There is also a large chest in the corner that is producing steam.\" width=\"975\" height=\"692\" data-media-type=\"image\/jpeg\" \/><figcaption class=\"wp-caption-text\"><strong>Figure 1.1.1 &#8211; This portrayal shows an alchemist\u2019s workshop circa 1580. Although alchemy made some useful contributions to how to manipulate matter, it was not scientific by modern standards. (credit: Chemical Heritage Foundation)<\/strong><\/figcaption><\/figure>\n<p>From alchemy came the historical progressions that led to modern chemistry: the isolation of drugs from natural sources, metallurgy, and the dye industry. Today, chemistry continues to deepen our understanding and improve our ability to harness and control the behavior of matter.<\/p>\n<h2>Chemistry: The Central Science<\/h2>\n<p>Chemistry is sometimes referred to as \u201cthe central science\u201d due to its interconnectedness with a vast array of other STEM disciplines (STEM stands for areas of study in the science, technology, engineering, and math fields). Chemistry and the language of chemists play vital roles in biology, medicine, materials science, forensics, environmental science, and many other fields (<a href=\"#Fig1.1.2\">Figure 1.1.2<\/a>). The basic principles of physics are essential for understanding many aspects of chemistry, and there is extensive overlap between many subdisciplines within the two fields, such as chemical physics and nuclear chemistry. Mathematics, computer science, and information theory provide important tools that help us calculate, interpret, describe, and generally make sense of the chemical world. Biology and chemistry converge in biochemistry, which is crucial to understanding the many complex factors and processes that keep living organisms (such as us) alive. Chemical engineering, materials science, and nanotechnology combine chemical principles and empirical findings to produce useful substances, ranging from gasoline to fabrics to electronics. Agriculture, food science, veterinary science, and brewing and wine making help provide sustenance in the form of food and drink to the world\u2019s population. Medicine, pharmacology, biotechnology, and botany identify and produce substances that help keep us healthy. Environmental science, geology, oceanography, and atmospheric science incorporate many chemical ideas to help us better understand and protect our physical world. Chemical ideas are used to help understand the universe in astronomy and cosmology.<\/p>\n<p>Knowledge of chemistry is central to understanding a wide range of scientific disciplines.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"Fig1.1.2\" class=\"scaled-down\">\n<figure style=\"width: 1300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2020\/04\/CNX_Chem_01_01_ChemWeb-1.jpg\" alt=\"A flowchart shows a box containing chemistry at its center. Chemistry is connected to geochemistry, nuclear chemistry, chemical physics, nanoscience and nanotechnology, materials science, chemical engineering, biochemistry and molecular biology, environmental science, agriculture, and mathematics. Each of these disciplines is further connected to other related fields including medicine, biology, food science, geology earth sciences, toxicology, physics, and computer science.\" width=\"1300\" height=\"564\" data-media-type=\"image\/jpeg\" \/><figcaption class=\"wp-caption-text\"><strong>Figure 1.1.2 &#8211; This diagram shows just some of the interrelationships between chemistry and other fields.<\/strong><\/figcaption><\/figure>\n<p>What are some changes in matter that are essential to daily life? Digesting and assimilating food, synthesizing polymers that are used to make clothing, containers, cookware, and credit cards, and refining crude oil into gasoline and other products are just a few examples. As you proceed through this course, you will discover many different examples of changes in the composition and structure of matter, how to classify these changes and how they occurred, their causes, the changes in energy that accompany them, and the principles and laws involved. As you learn about these things, you will be learning chemistry, the study of the composition, properties, and interactions of matter. The practice of chemistry is not limited to chemistry books or laboratories: It happens whenever someone is involved in changes in matter or in conditions that may lead to such changes.<\/p>\n<figure style=\"width: 1300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2019\/07\/CNX_Chem_03_00_Pool-1.jpg\" alt=\"This figure shows a swimming pool that is full of water and surrounded by a concrete patio.\" width=\"1300\" height=\"600\" data-media-type=\"image\/jpeg\" \/><figcaption class=\"wp-caption-text\"><strong>Figure 1.1.3 &#8211; The water in a swimming pool is a complex mixture of substances whose relative amounts must be carefully maintained to ensure the health and comfort of people using the pool. (credit: modification of work by Vic Brincat)<\/strong><\/figcaption><\/figure>\n<p>Swimming pools have long been a popular means of recreation, exercise, and physical therapy. Since it is impractical to refill large pools with fresh water on a frequent basis, pool water is regularly treated with chemicals to prevent the growth of harmful bacteria and algae. Proper pool maintenance requires regular additions of various chemical compounds in carefully measured amounts. For example, the relative amount of calcium ion, Ca<sup>2+<\/sup>, in the water should be maintained within certain limits to prevent eye irritation and avoid damage to the pool bed and plumbing. To maintain proper calcium levels, calcium cations are added to the water in the form of an ionic compound that also contains anions; thus, it is necessary to know both the relative amount of Ca<sup>2+<\/sup> in the compound and the volume of water in the pool in order to achieve the proper calcium level. Quantitative aspects of the composition of substances (such as the calcium-containing compound) and mixtures (such as the pool water) are the subject of this chapter.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"CNX_Chem_02_00_Biomarkers\" class=\"splash\">\n<figure style=\"width: 1300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2019\/07\/CNX_Chem_02_00_Biomarkers-1.jpg\" alt=\"A person is shown blowing into a tube connected to a plastic bag. There is a computer screen displaying data that reads \u201cMass Spectral Breath Analysis.\u201d An arrow from the plastic bag points to an illustration of different molecular compounds contained in the person\u2019s exhalation\" width=\"1300\" height=\"600\" data-media-type=\"image\/jpeg\" \/><figcaption class=\"wp-caption-text\"><strong>Figure 1.1.4 &#8211; Analysis of molecules in an exhaled breath can provide valuable information, leading to early diagnosis of diseases or detection of environmental exposure to harmful substances. (credit: modification of work by Paul Flowers)<\/strong><\/figcaption><\/figure>\n<\/div>\n<p>Your overall health and susceptibility to disease depends upon the complex interaction between your genetic makeup and environmental exposure, with the outcome difficult to predict. Early detection of biomarkers, substances that indicate an organism\u2019s disease or physiological state, could allow diagnosis and treatment before a condition becomes serious or irreversible. Recent studies have shown that your exhaled breath can contain molecules that may be biomarkers for recent exposure to environmental contaminants or for pathological conditions ranging from asthma to lung cancer. Scientists are working to develop biomarker \u201cfingerprints\u201d that could be used to diagnose a specific disease based on the amounts and identities of certain molecules in a patient\u2019s exhaled breath. An essential concept underlying this goal is that of a molecule\u2019s identity, which is determined by the numbers and types of atoms it contains, and how they are bonded together. This chapter will describe some of the fundamental chemical principles related to the composition of matter, including those central to the concept of molecular identity.<\/p>\n<h2>The Scientific Method<\/h2>\n<p>Chemistry is a science based on observation and experimentation. Doing chemistry involves attempting to answer questions and explain observations in terms of the laws and theories of chemistry, using procedures that are accepted by the scientific community. There is no single route to answering a question or explaining an observation, but there is an aspect common to every approach: Each uses knowledge based on experiments that can be reproduced to verify the results. Some routes involve a hypothesis, a tentative explanation of observations that acts as a guide for gathering and checking information. A hypothesis is tested by experimentation, calculation, and\/or comparison with the experiments of others and then refined as needed.<\/p>\n<p>Some hypotheses are attempts to explain the behavior that is summarized in laws. The laws of science summarize a vast number of experimental observations, and describe or predict some facet of the natural world. If such a hypothesis turns out to be capable of explaining a large body of experimental data, it can reach the status of a theory. Scientific theories are well-substantiated, comprehensive, testable explanations of particular aspects of nature. Theories are accepted because they provide satisfactory explanations, but they can be modified if new data become available. The path of discovery that leads from question and observation to law or hypothesis to theory, combined with experimental verification of the hypothesis and any necessary modification of the theory, is called the scientific method (<a href=\"#1.1.5\">Figure 1.1.5<\/a>).<\/p>\n<p>&nbsp;<\/p>\n<div id=\"1.1.5\" class=\"scaled-down\">\n<figure style=\"width: 1300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2020\/04\/CNX_Chem_01_01_SciMethod-1.jpg\" alt=\"In this flowchart, the observation and curiosity box has an arrow pointing to a box labeled form hypothesis; make prediction. A curved arrow labeled next connects this box to a box labeled perform experiment; make more observations. Another arrow points back to the box that says form hypothesis; make prediction. This arrow is labeled results not consistent with prediction. Another arrow, labeled results are consistent with prediction points from the perform experiment box to a box labeled contributes to body of knowledge. However, an arrow also points from contributes to body of knowledge back to the form hypothesis; make prediction box. This arrow is labeled further testing does not support hypothesis. There are also two other arrows leading out from contributes to body of knowledge. One arrow is labeled much additional testing yields constant observations. This leads to the observation becomes law box. The other arrow is labeled much additional testing supports hypothesis. This arrow leads to the hypothesis becomes theory box.\" width=\"1300\" height=\"766\" data-media-type=\"image\/jpeg\" \/><figcaption class=\"wp-caption-text\"><strong>Figure 1.1.5 &#8211; The scientific method follows a process similar to the one shown in this diagram. All the key components are shown, in roughly the right order. Scientific progress is seldom neat and clean: It requires open inquiry and the reworking of questions and ideas in response to findings.<\/strong><\/figcaption><\/figure>\n<h2>The Domains of Chemistry<\/h2>\n<p>Chemists study and describe the behavior of matter and energy in three different domains: macroscopic, microscopic, and symbolic. These domains provide different ways of considering and describing chemical behavior.<\/p>\n<p>Macro is a Greek word that means \u201clarge.\u201d The macroscopic domain is familiar to us: It is the realm of everyday things that are large enough to be sensed directly by human sight or touch. In daily life, this includes the food you eat and the breeze you feel on your face. The macroscopic domain includes everyday and laboratory chemistry, where we observe and measure physical and chemical properties such as density, solubility, and flammability.<\/p>\n<p>Micro comes from Greek and means \u201csmall.\u201d The microscopic domain of chemistry is often visited in the imagination. Some aspects of the microscopic domain are visible through standard optical microscopes, for example, many biological cells. More sophisticated instruments are capable of imaging even smaller entities such as molecules and atoms (see (Figure 1.1.6b)).<\/p>\n<p>However, most of the subjects in the microscopic domain of chemistry are too small to be seen even with the most advanced microscopes and may only be pictured in the mind. Other components of the microscopic domain include ions and electrons, protons and neutrons, and chemical bonds, each of which is far too small to see.<\/p>\n<p>The symbolic domain contains the specialized language used to represent components of the macroscopic and microscopic domains. Chemical symbols (such as those used in the periodic table), chemical formulas, and chemical equations are part of the symbolic domain, as are graphs, drawings, and calculations. These symbols play an important role in chemistry because they help interpret the behavior of the macroscopic domain in terms of the components of the microscopic domain. One of the challenges for students learning chemistry is recognizing that the same symbols can represent different things in the macroscopic and microscopic domains, and one of the features that makes chemistry fascinating is the use of a domain that must be imagined to explain behavior in a domain that can be observed.<\/p>\n<p>A helpful way to understand the three domains is via the essential and ubiquitous substance of water. That water is a liquid at moderate temperatures, will freeze to form a solid at lower temperatures, and boil to form a gas at higher temperatures (<a href=\"#CNX_Chem_01_01_WaterDom\">Figure 1.1.6<\/a>) are macroscopic observations. But some properties of water fall into the microscopic domain\u2014what cannot be observed with the naked eye. The description of water as comprising two hydrogen atoms and one oxygen atom, and the explanation of freezing and boiling in terms of attractions between these molecules, is within the microscopic arena. The formula H<sub>2<\/sub>O, which can describe water at either the macroscopic or microscopic levels, is an example of the symbolic domain. The abbreviations (g) for gas, (s) for solid, and (l) for liquid are also symbolic.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"CNX_Chem_01_01_WaterDom\" class=\"bc-figure figure\">\n<div class=\"bc-figcaption figcaption\"><\/div>\n<figure style=\"width: 1300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pressbooks.bccampus.ca\/unromantest\/wp-content\/uploads\/sites\/989\/2020\/04\/CNX_Chem_01_01_WaterDom-1.jpg\" alt=\"Figure A shows a photo of an iceberg floating in a sea has three arrows. Each arrow points to figure B, which contains three diagrams showing how the water molecules are organized in the air, ice, and sea. In the air, which contains the gaseous form of water, H subscript 2 O gas, the water molecules are disconnected and widely spaced. In the ice, which is the solid form of water, H subscript 2 O solid, the water molecules are bonded together into rings, with each ring containing six water molecules. Three of these rings are connected to each other. In the sea, which is the liquid form of water, H subscript 2 O liquid, the water molecules are very densely packed. The molecules are not bonded together.\" width=\"1300\" height=\"720\" data-media-type=\"image\/jpeg\" \/><figcaption class=\"wp-caption-text\"><strong>Figure 1.1.6 &#8211; (a) Moisture in the air, icebergs, and the ocean represent water in the macroscopic domain. (b) At the molecular level (microscopic domain), gas molecules are far apart and disorganized, solid water molecules are close together and organized, and liquid molecules are close together and disorganized. (c) The formula H2O symbolizes water, and (g), (s), and (l) symbolize its phases. Note that clouds actually comprise either very small liquid water droplets or solid water crystals; gaseous water in our atmosphere is not visible to the naked eye, although it may be sensed as humidity. (credit a: modification of work by \u201cGorkaazk\u201d\/Wikimedia Commons)<\/strong><\/figcaption><\/figure>\n<\/div>\n<h1>Key Concepts and Summary<\/h1>\n<p>Chemistry deals with the composition, structure, and properties of matter, and the ways by which various forms of matter may be interconverted. Thus, it occupies a central place in the study and practice of science and technology. Chemists use the scientific method to perform experiments, pose hypotheses, and formulate laws and develop theories, so that they can better understand the behaviour of the natural world. To do so, they operate in the macroscopic, microscopic, and symbolic domains. Chemists measure, analyze, purify, and synthesize a wide variety of substances that are important to our lives.<\/p>\n<div id=\"fs-idp75215696\" class=\"exercises\" data-depth=\"1\">\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">End of Chapter Exercises<\/header>\n<div class=\"textbox__content\">\n<div id=\"fs-idm34987968\" data-type=\"exercise\">\n<div id=\"fs-idm4947040\" data-type=\"problem\">\n<ol start=\"1\">\n<li>Explain how you could experimentally determine whether the outside temperature is higher or lower than 0 \u00b0C (32 \u00b0F) without using a thermometer.<\/li>\n<\/ol>\n<\/div>\n<div id=\"fs-idp19762080\" data-type=\"solution\">\n<p id=\"fs-idm53320912\" style=\"text-align: left;padding-left: 40px\"><strong><em>Solution<\/em><\/strong><\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Place a glass of water outside. It will freeze if the temperature is below 0 \u00b0C.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div id=\"fs-idp45595424\" data-type=\"exercise\">\n<div id=\"fs-idp64708304\" data-type=\"problem\">\n<ol start=\"2\">\n<li>Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning.\n<ol class=\"Decimal\">\n<li>Falling barometric pressure precedes the onset of bad weather.<\/li>\n<li>All life on earth has evolved from a common, primitive organism through the process of natural selection.<\/li>\n<li>My truck\u2019s gas mileage has dropped significantly, probably because it\u2019s due for a tune-up<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div id=\"fs-idp38309200\" data-type=\"exercise\">\n<div id=\"fs-idp83503984\" data-type=\"problem\">\n<ol start=\"3\">\n<li>Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning.\n<ol class=\"Decimal\">\n<li>The pressure of a sample of gas is directly proportional to the temperature of the gas.<\/li>\n<li>Matter consists of tiny particles that can combine in specific ratios to form substances with specific properties.<\/li>\n<li>At a higher temperature, solids (such as salt or sugar) will dissolve better in water.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p id=\"fs-idm53320912\" style=\"text-align: left;padding-left: 40px\"><strong><em>Solution<\/em><\/strong><\/p>\n<p style=\"text-align: left;padding-left: 40px\">(1) law (states a consistently observed phenomenon, can be used for prediction); (2) theory (a widely accepted explanation of the behavior of matter); (3) hypothesis (a tentative explanation, can be investigated by experimentation)<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"4\">\n<li>Identify each of the underlined items as a part of either the macroscopic domain, the microscopic domain, or the symbolic domain of chemistry. For any in the symbolic domain, indicate whether they are symbols for a macroscopic or a microscopic feature.\n<ol class=\"Decimal\">\n<li>The mass of a <u data-effect=\"underline\">lead pipe<\/u> is 14 lb.<\/li>\n<li>The mass of a certain <u data-effect=\"underline\">chlorine atom<\/u> is 35 amu.<\/li>\n<li>A bottle with a label that reads <u data-effect=\"underline\">Al<\/u> contains aluminum metal.<\/li>\n<li><u data-effect=\"underline\">Al<\/u> is the symbol for an aluminum atom.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div id=\"fs-idm67489232\" data-type=\"exercise\">\n<div id=\"fs-idp67411776\" data-type=\"problem\">\n<ol start=\"5\">\n<li>Identify each of the underlined items as a part of either the macroscopic domain, the microscopic domain, or the symbolic domain of chemistry. For those in the symbolic domain, indicate whether they are symbols for a macroscopic or a microscopic feature.\n<ol class=\"Decimal\">\n<li>A certain molecule contains one <u data-effect=\"underline\">H<\/u> atom and one Cl atom.<\/li>\n<li><u data-effect=\"underline\">Copper wire<\/u> has a density of about 8 g\/cm<sup>3<\/sup>.<\/li>\n<li>The bottle contains 15 grams of <u data-effect=\"underline\">Ni powder<\/u>.<\/li>\n<li>A <u data-effect=\"underline\">sulfur molecule<\/u> is composed of eight sulfur atoms.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <strong>Solution<\/strong><\/em><\/p>\n<p style=\"padding-left: 40px\"><span style=\"text-align: initial;font-size: 1em\">(1) symbolic, microscopic; (2) macroscopic; (3) symbolic, macroscopic; (4) microscopic<\/span><\/p>\n<\/div>\n<div id=\"fs-idp31026272\" style=\"padding-left: 40px\" data-type=\"solution\">\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div id=\"fs-idp6505632\" data-type=\"exercise\">\n<div id=\"fs-idm59649392\" data-type=\"problem\">\n<ol start=\"6\">\n<li>According to one theory, the pressure of a gas increases as its volume decreases because the molecules in the gas have to move a shorter distance to hit the walls of the container. Does this theory follow a macroscopic or microscopic description of chemical behavior? Explain your answer.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div id=\"fs-idp40361152\" data-type=\"exercise\">\n<div id=\"fs-idp111357888\" data-type=\"problem\">\n<ol start=\"7\">\n<li>The amount of heat required to melt 2 lbs of ice is twice the amount of heat required to melt 1 lb of ice. Is this observation a macroscopic or microscopic description of chemical behavior? Explain your answer.<\/li>\n<\/ol>\n<p><em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <strong>Solution<\/strong><\/em><\/p>\n<p style=\"padding-left: 40px\"><span style=\"text-align: initial;font-size: 1em\">\u00a0Macroscopic. The heat required is determined from macroscopic properties.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox shaded\">\n<h2>Glossary<\/h2>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2706\">chemistry<\/a><\/strong><\/p>\n<p>study of the composition, properties, and interactions of matter<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2707\">hypothesis<\/a><\/strong><\/p>\n<p>tentative explanation of observations that acts as a guide for gathering and checking information<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2708\">law<\/a><\/strong><\/p>\n<p>statement that summarizes a vast number of experimental observations, and describes or predicts some aspect of the natural world<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2709\">macroscopic domain<\/a><\/strong><\/p>\n<p>realm of everyday things that are large enough to sense directly by human sight and touch<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2710\">microscopic domain<\/a><\/strong><\/p>\n<p>realm of things that are much too small to be sensed directly<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2711\">scientific method<\/a><\/strong><\/p>\n<p>path of discovery that leads from question and observation to law or hypothesis to theory, combined with experimental verification of the hypothesis and any necessary modification of the theory<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2712\">symbolic domain<\/a><\/strong><\/p>\n<p>specialized language used to represent components of the macroscopic and microscopic domains, such as chemical symbols, chemical formulas, chemical equations, graphs, drawings, and calculations<\/p>\n<p><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_32_2713\">theory<\/a><\/strong><\/p>\n<p>well-substantiated, comprehensive, testable explanation of a particular aspect of nature<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"glossary\"><span class=\"screen-reader-text\" id=\"definition\">definition<\/span><template id=\"term_32_2706\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2706\"><div tabindex=\"-1\"><p>study of the composition, properties, and interactions of matter<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2707\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2707\"><div tabindex=\"-1\"><p>tentative explanation of observations that acts as a guide for gathering and checking information<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2708\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2708\"><div tabindex=\"-1\"><p>statement that summarizes a vast number of experimental observations, and describes or predicts some aspect of the natural world<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2709\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2709\"><div tabindex=\"-1\"><p>realm of everyday things that are large enough to sense directly by human sight and touch<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2710\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2710\"><div tabindex=\"-1\"><p>realm of things that are much too small to be sensed directly<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2711\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2711\"><div tabindex=\"-1\"><p>path of discovery that leads from question and observation to law or hypothesis to theory, combined with experimental verification of the hypothesis and any necessary modification of the theory<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2712\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2712\"><div tabindex=\"-1\"><p>specialized language used to represent components of the macroscopic and microscopic domains, such as chemical symbols, chemical formulas, chemical equations, graphs, drawings, and calculations<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_32_2713\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_32_2713\"><div tabindex=\"-1\"><p>well-substantiated, comprehensive, testable explanation of a particular aspect of nature<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close 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