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| Understanding the concepts
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Check your answers |
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| 1.
| Most chapters on the Web site have several tables from the text, which are useful for reviewing material when you are solving problems. Open each table to review common units and prefixes for units that you will encounter as you study chemistry.
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| 2.
| What are the three states of matter? List some characteristics that differentiate the three states of matter. Check your answers by accessing the Three States of Matter table on the Web site. |
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| 3.
| What is the difference between a physical change and a chemical change? On the CD, click on Visualizations for Chapter 3. Then click on the Visualization "Oxygen, Hydrogen, Soap Bubbles, and Balloons." When hydrogen and oxygen react together, the reaction is explosive (produces a lot of energy). Is this reaction a chemical or physical change? What is the product of the reaction between oxygen and hydrogen? To practice identifying physical and chemical changes, do Question 3.18 in the text. |
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| 4.
| What is the difference between an element, a compound, and a mixture? Which are pure substances? What is the difference between a homogeneous mixture and a heterogeneous mixture? For practice differentiating between pure substances, homogeneous mixtures and heterogeneous mixtures, do Questions 3.30, 3.32, and 3.84 in the text. |
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| 5.
| Define the energy unit of a calorie. The SI unit of energy is a joule. |
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| 6.
| On the Web site, open the Specific Heat Capacities of Some Common Substances Table. If 15 J of heat were added to 0.50 g of each substance in this table at 25.0°C, which substance would be at the highest temperature? Calculate the temperature. Which substance in this table requires the most energy to raise the temperature by 15°C? Assuming 0.75 g of substance, calculate the energy required. |
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| 7.
| Open Key Words on the CD and test your ability to define the important terms presented in Chapter 3. Come up with your own definition before clicking on the term. |
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| 8.
| Test your understanding of Chapter 3 by taking the ACE quizzes on the Web site. |
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