By Kenneth W. Whitten, Raymond E. Davis, Larry Peck, George G. Stanley
The Qualitative research chapters are actually on hand in a convenient paperback complement, ideal for bundling with the center textual content, CHEMISTRY, 8th version, or to be used as a standalone merchandise.
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EXAMPLE 1-2 Models Identify the state of matter represented by each of the following models. 4 States of Matter for an exercise. CHAPTER 1: The Foundations of Chemistry 10 Plan In a solid, the molecules are held close together in a regular arrangement. In a liquid, the molecules are close together but are randomly arranged because they ﬂow past one another. In a gas, molecules are far apart. Solution (a) The atoms are close together and regularly arranged, so this model represents the surface of a solid .
An example of a physical change that is endothermic is the melting of ice. The Law of Conservation of Matter When we burn a sample of metallic magnesium in oxygen, the magnesium combines with the oxygen (Figure 1-1) to form magnesium oxide, a white powder. This chemical reaction is accompanied by the release of large amounts of heat energy and light energy. When we weigh the product of the reaction, magnesium oxide, we ﬁnd that it is heavier than the original piece of magnesium. The increase in the mass of the solid is due to the combination of oxygen with magnesium to form magnesium oxide.
Read the assigned material again and take notes, integrating these with your class notes. Reading should be much more informative the second time. Review the key terms at the end of the chapter to be sure that you understand the meaning of each term. Work the illustrative examples in the text while covering the solutions with a sheet of paper. If you ﬁnd it necessary to look at the solutions, look at only one line at a time and try to ﬁgure out the next step. Answers to illustrative examples are displayed on blue backgrounds.