Question 1

A solution is prepared by dissolving 10.0 g of NaCl in 100.0 g of water. Which of the following best describes the effect of this solute on the vapor pressure of water at 25°C?
Correct answer: The vapor pressure of water decreases because NaCl lowers the escaping tendency of water molecules.

Accepted Answer

The vapor pressure of water decreases because NaCl lowers the escaping tendency of water molecules.

Question 2

Which of the following statements about the rate of a chemical reaction is correct?
Correct answer: The rate of a reaction generally increases with increasing temperature due to higher kinetic energy of molecules.

Accepted Answer

The rate of a reaction generally increases with increasing temperature due to higher kinetic energy of molecules.

Question 3

A student mixes 0.1 M acetic acid (CH3COOH) with 0.1 M sodium acetate (CH3COONa). What is the primary function of this mixture in a laboratory setting?
Correct answer: To serve as a buffer solution, resisting changes in pH upon addition of small amounts of acid or base.

Accepted Answer

To serve as a buffer solution, resisting changes in pH upon addition of small amounts of acid or base.

Question 4

Which of the following best explains why the addition of a catalyst increases the rate of a chemical reaction?
Correct answer: A catalyst provides an alternative pathway with lower activation energy for the reaction.

Accepted Answer

A catalyst provides an alternative pathway with lower activation energy for the reaction.

Question 5

Consider the following equilibrium: N2(g) + 3H2(g) ⇌ 2NH3(g). If the system is at equilibrium and more N2 is added, what will happen to the concentration of NH3?
Correct answer: The concentration of NH3 will increase as the system shifts to the right to re-establish equilibrium.

Accepted Answer

The concentration of NH3 will increase as the system shifts to the right to re-establish equilibrium.

Question 6

Which of the following is the correct expression for the equilibrium constant (K) for the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g)?
Correct answer: K = [SO3]^2 / ([SO2]^2 [O2])

Accepted Answer

K = [SO3]^2 / ([SO2]^2 [O2])

Question 7

A reaction has ΔH = -100 kJ and ΔS = -200 J/K. At what temperature (in Kelvin) does the reaction change from spontaneous to non-spontaneous?
Correct answer: T = 500 K

Accepted Answer

T = 500 K

Question 8

Which of the following best describes the function of a salt bridge in a galvanic cell?
Correct answer: It maintains electrical neutrality by allowing ions to migrate between half-cells.

Accepted Answer

It maintains electrical neutrality by allowing ions to migrate between half-cells.

Question 9

Which of the following statements about nuclear fission and fusion is correct?
Correct answer: Nuclear fission involves splitting a heavy nucleus into lighter nuclei, releasing energy.

Accepted Answer

Nuclear fission involves splitting a heavy nucleus into lighter nuclei, releasing energy.

Question 10

A 50.0 g sample of water is heated from 25.0°C to 75.0°C. If the specific heat capacity of water is 4.18 J/g·°C, how much heat is absorbed?
Correct answer: 10,450 J

Accepted Answer

10,450 J

Question 11

Which of the following best explains why freezing point depression is considered a colligative property?
Correct answer: It depends only on the number of solute particles, not their identity.

Accepted Answer

It depends only on the number of solute particles, not their identity.

Question 12

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 the reaction?
Correct answer: rate = k[A][B]^2

Accepted Answer

rate = k[A][B]^2

Question 13

Which of the following is a correct application of Le Châtelier’s Principle?
Correct answer: Decreasing the temperature of an exothermic reaction at equilibrium will shift the equilibrium to the right.

Accepted Answer

Decreasing the temperature of an exothermic reaction at equilibrium will shift the equilibrium to the right.

Question 14

Which of the following best describes the role of entropy (ΔS) in determining the spontaneity of a reaction?
Correct answer: A positive ΔS favors spontaneity, especially at higher temperatures.

Accepted Answer

A positive ΔS favors spontaneity, especially at higher temperatures.

Question 15

A patient is given an intravenous solution of 0.9% NaCl (normal saline). Which property of this solution is most important for its medical use?
Correct answer: It is isotonic with blood plasma, preventing cell lysis or crenation.

Accepted Answer

It is isotonic with blood plasma, preventing cell lysis or crenation.

Question 16

Which of the following is true regarding the Nernst equation in electrochemistry?
Correct answer: It relates the cell potential to the concentrations of reactants and products.

Accepted Answer

It relates the cell potential to the concentrations of reactants and products.

Question 17

Which of the following best explains why polyprotic acids have more than one equivalence point in a titration curve?
Correct answer: Each proton is removed in a separate step, each with its own equivalence point.

Accepted Answer

Each proton is removed in a separate step, each with its own equivalence point.

Question 18

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

Accepted Answer

10 g

Question 19

Which of the following is a valid criticism of a scientific claim that a new 'miracle' chemical can cure all diseases, based on a single laboratory experiment?
Correct answer: The claim lacks sufficient evidence and reproducibility, which are essential for scientific validity.

Accepted Answer

The claim lacks sufficient evidence and reproducibility, which are essential for scientific validity.

General Chemistry II: Course Overview and Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards