Question 1

A solution is prepared by dissolving 110.0 g of ethylene glycol (C2H6O2, MW = 62.07 g/mol) in 4550 g of water. Calculate the freezing point of the solution. ($K_f$ for water = $1.86\ \mathrm{^	ext{o}C\ kg/mol}$).

Accepted Answer

$-0.66\ \mathrm{^	ext{o}C}$

Question 2

Which of the following compounds can form hydrogen bonds with water? Select all that apply.

Accepted Answer

CH3OH

Question 3

A 3.79 M NaCl solution has a density of $1.20\ \mathrm{g/mL}$. What is the molality of the solution?

Accepted Answer

$3.16\ \mathrm{mol/kg}$

Question 4

Which of the following ions has the highest enthalpy of hydration?

Accepted Answer

$Al^{3+}$

Question 5

Which of the following statements about vapor pressure is correct?

Accepted Answer

Vapor pressure increases as temperature increases.

Question 6

A solution containing 1.0 g of HI in 400.0 g of water has a freezing point of $-0.054\ \mathrm{^	ext{o}C}$. What is the molecular weight of HI? ($K_f$ for water = $1.86\ \mathrm{^	ext{o}C\ kg/mol}$)

Accepted Answer

$128\ \mathrm{g/mol}$

Question 7

Which of the following substances is most soluble in water?

Accepted Answer

CH3OH

Question 8

Which of the following compounds has the highest boiling point?

Accepted Answer

CH3CH2OH

Question 9

Which of the following best explains why acetone (CH3COCH3) has a higher vapor pressure than water at the same temperature?

Accepted Answer

Acetone has weaker intermolecular forces than water.

Question 10

Which of the following is the correct expression for the change in boiling point ($\Delta T_b$) of a solution?

Accepted Answer

$\Delta T_b = K_b \cdot m$

Question 11

Which of the following best describes the effect of adding a nonvolatile solute to a solvent?

Accepted Answer

The freezing point of the solution decreases.

Question 12

Which of the following compounds exhibits only London dispersion forces?

Accepted Answer

CH4

Question 13

Which of the following is NOT a colligative property?

Accepted Answer

Molar mass

Question 14

Which of the following aqueous solutions will have the lowest freezing point?

Accepted Answer

0.10 m CaCl2

Question 15

Which of the following statements about intermolecular forces is correct?

Accepted Answer

London dispersion forces are present in all molecules.

Question 16

Which of the following best describes the relationship between vapor pressure and boiling point?

Accepted Answer

A liquid boils when its vapor pressure equals atmospheric pressure.

Question 17

Which of the following is the correct formula for calculating the enthalpy of solution ($\Delta H_{solution}$)?

Accepted Answer

$\Delta H_{solution} = \Delta H_{solute} + \Delta H_{solvent} + \Delta H_{mix}$

Question 18

Which of the following best explains why salt is spread on icy roads in winter?

Accepted Answer

Salt decreases the freezing point of water.

Question 19

Which of the following is the correct expression for Henry's Law?

Accepted Answer

$C = k_P \cdot P_{gas}$

Question 20

Which of the following best describes the effect of increasing temperature on the solubility of gases in water?

Accepted Answer

Solubility decreases with increasing temperature.

General Chemistry IIA: Practice Exam 1

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