Adapted by Nelson Nuñez-Rodriguez
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By David W. Ball
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| QUESTION | ANSWER |
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1. What is the difference between melting and solidification? |
1. Melting is the phase change from a solid to a liquid, whereas solidification is the phase change from a liquid to a solid. |
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3. Describe the molecular changes when a solid becomes a liquid. |
3. The molecules have enough energy to move about each other but not enough to completely separate from each other. |
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5. What is the energy change when 78.0 g of Hg melt at −38.8°C? |
5. 890 J |
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7. What is the energy change when 111 g of Br2 boil at 59.5°C? |
7. 10.7 kJ |
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9. Each of the following statements is incorrect. Rewrite them so they are correct.
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9.
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11. Write the chemical equation for the melting of elemental sodium. |
11. Na(s) → Na(ℓ) |
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13. Write the chemical equation for the sublimation of CO2. |
13. CO2(s) → CO2(g) |
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15. What is the ΔHsub of H2O? (Hint: see Table 3.2 "Enthalpies of Fusion for Various Substances" and Table 3.3 "Enthalpies of Vaporization for Various Substances".) |
15. 46.69 kJ/mol |