Q: Which solvent would be better for dissolving KCl, and why?

Water, because it is polar and can stabilize ions

Q: Which of the following best explains why water is a better solvent for CH$_3$COOH than benzene?

Water can form hydrogen bonds with CH$_3$COOH

Question 1

A 275.0 mL container holds nitrogen monoxide (NO) gas at 32.5 °C and 75 kPa. How many moles of NO are present? (Use $R = 8.314 \ \mathrm{J/(mol \cdot K)}$)

Accepted Answer

$0.0081 \ \mathrm{mol}$

Question 2

A vessel of volume 22.4 L contains 2.0 mol H$_2$(g) and 1.0 mol N$_2$(g) at 298 K. What is the partial pressure of H$_2$ in the vessel? (Use $R = 0.0821 \ \mathrm{L \cdot atm/(mol \cdot K)}$)

Accepted Answer

$2.18 \ \mathrm{atm}$

Question 3

Which types of intermolecular forces are present in NH$_2$OH?

Accepted Answer

London dispersion, dipole-dipole, and hydrogen bonding

Question 4

How much heat (in kJ) is required to raise the temperature of 300.0 g of water from 20.0 °C to 100.0 °C? ($c = 4184 \ \mathrm{J/(kg \cdot K)}$)

Accepted Answer

$80.0 \ \mathrm{kJ}$

Question 5

Which of the following best describes the criteria for a chemical reaction to be spontaneous at constant pressure and temperature?

Accepted Answer

$\Delta G < 0$

Question 6

The vapor pressure of dimethyl ether at $-58 \ ^\circ \mathrm{C}$ is 18.1 kPa and its enthalpy of vaporization is 21.51 kJ/mol. What is the boiling point of dimethyl ether at 1 atm? (Use $1 \ \mathrm{atm} = 101.3 \ \mathrm{kPa}$ and the Clausius-Clapeyron equation)

Accepted Answer

$-24 \ ^\circ \mathrm{C}$

Question 7

Which solvent would be better for dissolving KCl, and why?

Accepted Answer

Water, because it is polar and can stabilize ions

Question 8

What is the molality of a solution prepared by dissolving 25.0 g of NaCl in 500.0 g of water? ($M_{NaCl} = 58.44 \ \mathrm{g/mol}$)

Accepted Answer

$0.68 \ \mathrm{mol/kg}$

Question 9

Which intermolecular forces are present in CBr$_4$?

Accepted Answer

London dispersion only

Question 10

Estimate the temperature at which the following reaction becomes spontaneous under standard conditions: $\Delta H = 100 \ \mathrm{kJ}$, $\Delta S = 200 \ \mathrm{J/K}$.

Accepted Answer

$500 \ \mathrm{K}$

Question 11

Which of the following best explains why water is a better solvent for CH$_3$COOH than benzene?

Accepted Answer

Water can form hydrogen bonds with CH$_3$COOH

Question 12

Which of the following is NOT a criterion for a reaction to be spontaneous at constant pressure and temperature?

Accepted Answer

$\Delta G > 0$

Question 13

Which intermolecular forces are present in H$_2$O?

Accepted Answer

London dispersion, dipole-dipole, and hydrogen bonding

Question 14

A chemist is considering using vaporized aluminum chloride as a rocket fuel. Which property is most important to assess its suitability as a fuel?

Accepted Answer

Whether its oxidation is spontaneous at high temperature

Question 15

If the enthalpy of formation of TNT is 267 kJ/mol, what does this value represent?

Accepted Answer

The enthalpy change when 1 mol of TNT is formed from its elements in their standard states

Question 16

Which solvent would be better for dissolving CCl$_4$, and why?

Accepted Answer

Benzene, because both are nonpolar

Question 17

A reaction has $\Delta H = -50 \ \mathrm{kJ}$ and $\Delta S = -100 \ \mathrm{J/K}$. At what temperature does the reaction become non-spontaneous?

Accepted Answer

$500 \ \mathrm{K}$

Question 18

Which of the following is a correct application of the Clausius-Clapeyron equation?

Accepted Answer

To estimate the boiling point of a liquid at a different pressure

General Chemistry Midterm Exam I: Study Notes and Worked Examples

Study Guide - Practice Questions

Study Guide - Flashcards