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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Properties of Liquids

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QUESTION ANSWER

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.

3.

Define normal boiling point in terms of vapor pressure.

3.

the temperature at which the vapor pressure of a liquid is 760 torr

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

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

9.

Explain how surface tension works.

9.

Surface tension is an imbalance of attractive forces between liquid molecules at the surface of a liquid.

11.

Under what conditions would a liquid demonstrate a capillary rise?

11.

Adhesion must be greater than cohesion.

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