Question 1

Which of the following correctly lists the intermolecular forces from strongest to weakest?

Accepted Answer

Ion-dipole, hydrogen bond, dipole-dipole, London dispersion

Question 2

A beaker of water is left uncovered in a room. Over time, the water level decreases. Which property best explains this observation?

Accepted Answer

Vapor pressure

Question 3

Which of the following statements about surface tension is correct?

Accepted Answer

Surface tension is higher in liquids with stronger intermolecular forces.

Question 4

Why does increasing the temperature of a liquid generally decrease its viscosity?

Accepted Answer

Increased temperature provides more kinetic energy to overcome intermolecular forces.

Question 5

Which of the following would have the highest vapor pressure at the same temperature?

Accepted Answer

A liquid with weak intermolecular forces

Question 6

A puddle of water evaporates faster than the same amount of water in a narrow glass. Why?

Accepted Answer

The puddle has a greater surface area, increasing the rate of vaporization.

Question 7

Which equation relates the vapor pressures of a liquid at two different temperatures?

Accepted Answer

$$\ln \left( \frac{P_2$}{P_1$} \right) = -\frac{\Delta H_{vap}}{R} \left( \frac{1}{T_2$} - \frac{1}{T_1$} \right)$$

Question 8

At what point does boiling occur in an open container?

Accepted Answer

When the vapor pressure of the liquid equals the atmospheric pressure

Question 9

Which property is most directly responsible for the high boiling point of water compared to other group 16 hydrides?

Accepted Answer

Hydrogen bonding

Question 10

A liquid with high viscosity is most likely to have which of the following characteristics?

Accepted Answer

Strong intermolecular forces

Question 11

If the atmospheric pressure increases, what happens to the boiling point of a liquid?

Accepted Answer

The boiling point increases

Question 12

Which of the following best explains why molecules at the surface of a liquid are less stable than those in the interior?

Accepted Answer

Surface molecules experience fewer intermolecular interactions than interior molecules.

Question 13

Which of the following changes would increase the rate of vaporization of a liquid?

Accepted Answer

Increasing the surface area of the liquid

Question 14

Which of the following is true about the critical point on a phase diagram?

Accepted Answer

Above the critical temperature, no amount of pressure can liquefy the gas.

Question 15

Which of the following best describes the relationship between intermolecular forces and vapor pressure?

Accepted Answer

Stronger intermolecular forces result in lower vapor pressure.

Question 16

A sample of liquid is heated at constant pressure. Which of the following occurs at the boiling point?

Accepted Answer

The vapor pressure of the liquid equals the external pressure.

Question 17

Which of the following would most likely have the greatest surface tension at room temperature?

Accepted Answer

Water ($$H_2O)$$

Question 18

If a liquid has a high rate of vaporization but a low vapor pressure, which of the following is most likely true?

Accepted Answer

The liquid is in an open container and is being replenished as it evaporates.

Question 19

Which of the following best explains why the boiling point of a liquid increases with increasing external pressure?

Accepted Answer

A higher external pressure requires a higher temperature for the vapor pressure to equal the external pressure.

Question 20

Which of the following is NOT a consequence of strong intermolecular forces in a liquid?

Accepted Answer

Low surface tension

CH 10

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