Question 1

Which of the following best describes the concept of colligative properties in solutions?

Accepted Answer

Properties that depend only on the number of solute particles present, not their identity.

Question 2

A solution is prepared by dissolving 1 mol of NaCl in 1 kg of water. Which equation would you use to calculate the freezing point depression ($$\Delta T_f) of $$the solution?

Accepted Answer

$$\Delta T_f = i \cdot K_f \cdot m$$

Question 3

Which statement correctly explains why the vapor pressure of a solution is lower than that of the pure solvent?

Accepted Answer

Solute particles block solvent molecules from escaping into the vapor phase.

Question 4

A student mixes 0.5 mol of glucose (a non-electrolyte) in 1 kg of water. What is the expected van't Hoff factor ($$i) $$for this solution?

Accepted Answer

$$i = 1$$

Question 5

Which equation is used to relate the equilibrium constant ($$K) to $$the standard free energy change ($$\Delta G^\circ) of a $$reaction?

Accepted Answer

$$\Delta G^\circ = -RT \ln K$$

Question 6

A reaction has an activation energy of 50 kJ/mol. If the temperature is increased, what will happen to the rate constant ($$k) $$according to the Arrhenius equation?

Accepted Answer

The rate constant will increase.

Question 7

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 8

Given the following reaction: $$\ce{N_2$(g) + 3H_2(g) \rightarrow 2NH_3(g)}$$, which expression represents the equilibrium constant $$K_c$$?

Accepted Answer

$$K_c = \frac{[NH_3$]^2}{[N_2$][H_2$]^3}$$

Question 9

A weak acid, HA, has a $$K_a of$$ $$1.8 	imes 10$$^{-5}$$. What is the pH of a 0.10 M solution of HA? (Assume x$$ \ll 0.10$$)

Accepted Answer

pH = 2.72

Question 10

Which of the following statements about entropy ($$S) is $$correct?

Accepted Answer

Entropy is a measure of the disorder or randomness of a system.

Question 11

A solution contains 0.2 mol of Na$$_2SO$_4$$ dissolved in 1 kg of water. What is the van't Hoff factor ($$i) $$for Na$$_2SO$_4$$?

Accepted Answer

$$i = 3$$

Question 12

Which of the following is the correct expression for the rate law of a reaction that is first order in A and second order in B?

Accepted Answer

Rate = $$k[A][B]^2$$

Question 13

Which equation is used to calculate the osmotic pressure ($$\Pi) of a $$dilute solution?

Accepted Answer

$$\Pi = iMRT$$

Question 14

A student is asked to calculate the pH of a buffer solution made from 0.1 M acetic acid and 0.1 M sodium acetate. Which equation should be used?

Accepted Answer

Henderson-Hasselbalch equation: $$\mathrm{pH} = \mathrm{p}K_a + \log \left( \frac{[	ext{A}^-]}{[	ext{HA}]} ight)$$

Question 15

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It decreases the activation energy and increases the reaction rate.

Question 16

A solution is prepared by mixing 0.1 mol of KCl and 0.1 mol of CaCl$$_2 in 1 kg of $$water. What is the total number of moles of ions produced?

Accepted Answer

0.7 mol

Question 17

Which of the following is true about the relationship between reaction rate and concentration for a zero-order reaction?

Accepted Answer

The rate is independent of concentration.

Question 18

Which equation is used to calculate the solubility product constant ($$K_{sp}) $$for a salt AB$$_2$$ that dissociates as $$\ce{AB_2$ \rightarrow A$$^{2+}$$ + 2B^-}$$?

Accepted Answer

$$K_{sp} = [A$$^{2+}$$][B^-]^2$$

Question 19

Which of the following is a correct statement about oxidation-reduction (redox) reactions?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

General Chemistry II Syllabus and Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards