Question 1

Which of the following statements correctly describes a strong electrolyte?

Accepted Answer

It completely dissociates into ions in water and conducts electricity well.

Question 2

Given the solubility rules, which of the following compounds is insoluble in water?

Accepted Answer

AgCl

Question 3

What is the net ionic equation for the reaction between Na$_2$SO$_4$(aq) and BaCl$_2$(aq)?

Accepted Answer

$\mathrm{Ba^{2+}(aq) + SO_4^{2-}(aq) \rightarrow BaSO_4(s)}$

Question 4

A solution is prepared by diluting 50.0 mL of 6.0 M HCl to a final volume of 300.0 mL. What is the final concentration?

Accepted Answer

$1.0\ \mathrm{M}$

Question 5

Which intermolecular force is strongest in CH$_3$OH (methanol)?

Accepted Answer

Hydrogen bonding

Question 6

Which of the following will increase the solubility of a gas in water?

Accepted Answer

Increasing the pressure

Question 7

Calculate the vapor pressure of a solution made by dissolving 0.50 mol NaCl in 1.50 mol H$_2$O. The vapor pressure of pure water at this temperature is 25.0 torr. Assume complete dissociation and ideal behavior.

Accepted Answer

$P_{solution} = 18.8\ \mathrm{torr}$

Question 8

Which equation is used to calculate the osmotic pressure of a solution?

Accepted Answer

$\pi = MRT$

Question 9

A reaction has a rate law: $\mathrm{Rate = k[NO_2]^2}$. What is the overall order of the reaction?

Accepted Answer

Second order

Question 10

If the concentration of a reactant in a first-order reaction is doubled, how does the rate change?

Accepted Answer

It doubles

Question 11

Which integrated rate law corresponds to a second-order reaction?

Accepted Answer

$\frac{1}{[A]_t} = kt + \frac{1}{[A]_0}$

Question 12

For a reaction with the rate law $\mathrm{Rate = k[A][B]}$, what are the units of the rate constant k?

Accepted Answer

$\mathrm{M^{-1}\ s^{-1}}$

Question 13

A catalyst in a chemical reaction:

Accepted Answer

Provides an alternative pathway with lower activation energy

Question 14

Using the Arrhenius equation, which variable represents the activation energy?

Accepted Answer

$E_a$

Question 15

Given the two-point Arrhenius equation $\ln\left(\frac{k_2}{k_1}\right) = \frac{E_a}{R}\left(\frac{1}{T_1} - \frac{1}{T_2}\right)$, what happens to the rate constant $k$ as temperature increases?

Accepted Answer

It increases

Question 16

Which of the following is true about the vapor pressure of a solvent when a nonvolatile solute is added?

Accepted Answer

It decreases

Question 17

What is the van’t Hoff factor ($i$) for CaCl$_2$?

Accepted Answer

$i = 3$

Question 18

Which graph would you expect for a first-order reaction?

Accepted Answer

A plot of $\ln [A]$ vs. time with a negative slope

Question 19

Which of the following is a correct statement about half-life for a first-order reaction?

Accepted Answer

It is given by $t_{1/2} = \frac{\ln 2}{k}$

Question 20

Which of the following is NOT a factor that affects the rate of a chemical reaction?

Accepted Answer

Color of the reactants

CHM 109 Exam 1 Study Guide: Solutions, Kinetics, and Intermolecular Forces

Study Guide - Practice Questions

Study Guide - Flashcards