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 evaporation and boiling? |
1. Evaporation occurs when a liquid becomes a gas at temperatures below that liquid’s boiling point, whereas boiling is the conversion of a liquid to a gas at the liquid’s boiling point. |
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3. Define normal boiling point in terms of vapor pressure. |
3. the temperature at which the vapor pressure of a liquid is 760 torr |
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5. Referring to Figure 3.7 "Plots of Vapor Pressure versus Temperature for Several Liquids", if the pressure is 400 torr, which liquid boils at the lowest temperature? |
5. diethyl ether |
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7. Referring to Figure 3.7 "Plots of Vapor Pressure versus Temperature for Several Liquids", estimate the boiling point of ethanol at 200 torr. |
7. 48°C |
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9. Explain how surface tension works. |
9. Surface tension is an imbalance of attractive forces between liquid molecules at the surface of a liquid. |
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11. Under what conditions would a liquid demonstrate a capillary rise? |
11. Adhesion must be greater than cohesion. |