Question 1

Which of the following best explains why water has a much higher boiling point than methane (CH4), despite their similar molar masses?
Correct answer: Water molecules form strong hydrogen bonds, while methane molecules experience only London dispersion forces.

Accepted Answer

Water molecules form strong hydrogen bonds, while methane molecules experience only London dispersion forces.

Question 2

A solution is prepared by dissolving NaCl in water. Which of the following statements best describes the intermolecular forces present in the solution?
Correct answer: Ion-dipole interactions between Na+ and Cl- ions and water molecules are the dominant forces.

Accepted Answer

Ion-dipole interactions between Na+ and Cl- ions and water molecules are the dominant forces.

Question 3

A reaction is found to be first order in A and second order in B. Which of the following is the correct rate law for this reaction?
Correct answer: rate = k[A][B]^2

Accepted Answer

rate = k[A][B]^2

Question 4

Which of the following changes will shift the equilibrium of the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) to the right?
Correct answer: Increasing the pressure by decreasing the volume of the container.

Accepted Answer

Increasing the pressure by decreasing the volume of the container.

Question 5

A student mixes equal volumes of 0.1 M acetic acid (CH3COOH) and 0.1 M sodium acetate (CH3COONa). What type of solution is formed and what is its significance?
Correct answer: A buffer solution, which resists changes in pH upon addition of small amounts of acid or base.

Accepted Answer

A buffer solution, which resists changes in pH upon addition of small amounts of acid or base.

Question 6

Which of the following best describes the role of a catalyst in a chemical reaction?
Correct answer: It lowers the activation energy, increasing the rate of the reaction without being consumed.

Accepted Answer

It lowers the activation energy, increasing the rate of the reaction without being consumed.

Question 7

A voltaic (galvanic) cell is constructed using a Zn/Zn2+ half-cell and a Cu/Cu2+ half-cell. Which statement is correct regarding electron flow and cell potential?
Correct answer: Electrons flow from the zinc electrode to the copper electrode, and the cell potential is positive.

Accepted Answer

Electrons flow from the zinc electrode to the copper electrode, and the cell potential is positive.

Question 8

Which of the following statements about the second law of thermodynamics is correct?
Correct answer: The total entropy of the universe increases in any spontaneous process.

Accepted Answer

The total entropy of the universe increases in any spontaneous process.

Question 9

A radioactive isotope decays with a half-life of 10 years. If you start with 80 grams, how much remains after 30 years?
Correct answer: 10 grams

Accepted Answer

10 grams

Question 10

Which of the following best explains why adding a nonvolatile solute to a solvent lowers the solvent’s vapor pressure?
Correct answer: The solute particles occupy surface sites, reducing the number of solvent molecules able to escape into the vapor phase.

Accepted Answer

The solute particles occupy surface sites, reducing the number of solvent molecules able to escape into the vapor phase.

Question 11

A solution is prepared by mixing 100 mL of 1.0 M HCl with 100 mL of 1.0 M NaOH. What is the resulting pH of the solution?
Correct answer: 7

Accepted Answer

7

Question 12

Which of the following is a correct statement about chemical equilibrium?
Correct answer: At equilibrium, the rates of the forward and reverse reactions are equal.

Accepted Answer

At equilibrium, the rates of the forward and reverse reactions are equal.

Question 13

Which of the following would increase the rate of a reaction, according to collision theory?
Correct answer: Increasing the temperature, which increases the kinetic energy and frequency of effective collisions.

Accepted Answer

Increasing the temperature, which increases the kinetic energy and frequency of effective collisions.

Question 14

Which of the following is true for a spontaneous redox reaction in an electrochemical cell?
Correct answer: The cell potential (E°cell) is positive.

Accepted Answer

The cell potential (E°cell) is positive.

Question 15

A patient is given a solution of sodium bicarbonate (NaHCO3) to neutralize excess stomach acid (HCl). Which type of reaction occurs in the stomach?
Correct answer: An acid-base neutralization reaction producing CO2, water, and NaCl.

Accepted Answer

An acid-base neutralization reaction producing CO2, water, and NaCl.

Question 16

Which of the following best describes the effect of temperature on the equilibrium constant (K) for an exothermic reaction?
Correct answer: Increasing temperature decreases K.

Accepted Answer

Increasing temperature decreases K.

Question 17

Which of the following is the best example of a colligative property?
Correct answer: Boiling point elevation of a solution when salt is added to water.

Accepted Answer

Boiling point elevation of a solution when salt is added to water.

Question 18

Which of the following statements about nuclear fission and fusion is correct?
Correct answer: Fusion combines light nuclei to form heavier nuclei, releasing large amounts of energy.

Accepted Answer

Fusion combines light nuclei to form heavier nuclei, releasing large amounts of energy.

Question 19

A chemical reaction has ΔH = +50 kJ and ΔS = +100 J/K. At what minimum temperature (in Kelvin) will the reaction become spontaneous?
Correct answer: 500 K

Accepted Answer

500 K

Question 20

Which of the following is the best strategy for mastering advanced general chemistry concepts, according to the course study tips?
Correct answer: Focus on understanding concepts and practicing problem-solving regularly, rather than last-minute memorization.

Accepted Answer

Focus on understanding concepts and practicing problem-solving regularly, rather than last-minute memorization.

Key Points from Chemistry Fundamentals II (CHM 2046) Syllabus

Study Guide - Practice Questions

Study Guide - Flashcards