Question 1

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of NaCl in the solution?

Accepted Answer

$0.50\ \mathrm{M}$

Question 2

Which of the following will result in the greatest freezing point depression when dissolved in water?

Accepted Answer

$0.1\ \mathrm{mol}$ of $\mathrm{CaCl_2}$

Question 3

Which intermolecular force is primarily responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 4

The rate law for a reaction is $\mathrm{Rate} = k[NO_2]^2$. If the concentration of $NO_2$ is doubled, what happens to the rate?

Accepted Answer

It quadruples

Question 5

A reaction has an activation energy of $50\ \mathrm{kJ/mol}$. What does this value represent?

Accepted Answer

The minimum energy required for reactants to form products

Question 6

For the reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$, the equilibrium constant $K_c$ is $0.50$ at $300\ ^\circ\mathrm{C}$. If $[N_2] = 0.20\ \mathrm{M}$, $[H_2] = 0.60\ \mathrm{M}$, and $[NH_3] = 0.10\ \mathrm{M}$, what is the value of $Q_c$?

Accepted Answer

$Q_c = \dfrac{[NH_3]^2}{[N_2][H_2]^3} = \dfrac{(0.10)^2}{(0.20)(0.60)^3} = 0.077$

Question 7

Which of the following is a strong acid?

Accepted Answer

$HNO_3$

Question 8

Calculate the pH of a $0.01\ \mathrm{M}$ $HCl$ solution.

Accepted Answer

$pH = 2$

Question 9

Which of the following will increase the solubility of $AgCl$ in water?

Accepted Answer

Adding $NH_3$

Question 10

Which process results in an increase in entropy ($\Delta S > 0$)?

Accepted Answer

Evaporating alcohol

Question 11

Given $\Delta H = -100\ \mathrm{kJ}$ and $\Delta S = -200\ \mathrm{J/K}$, at what temperature does the reaction become nonspontaneous?

Accepted Answer

$T > 500\ \mathrm{K}$

Question 12

Which isotope has 6 protons and 8 neutrons?

Accepted Answer

$^{14}C$

Question 13

Which nuclear process is responsible for the energy produced in the sun?

Accepted Answer

Nuclear fusion

Question 14

A radioactive isotope has a half-life of 10 years. How much of a 100 g sample remains after 30 years?

Accepted Answer

12.5 g

Question 15

Balance the following redox reaction in acidic solution: $MnO_4^- + Fe^{2+} \rightarrow Mn^{2+} + Fe^{3+}$

Accepted Answer

$MnO_4^- + 5Fe^{2+} + 8H^+ \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_2O$

Question 16

A voltaic cell is constructed using $Zn$ and $Cu$ electrodes. The standard reduction potentials are $E^\circ_{Zn^{2+}/Zn} = -0.76\ \mathrm{V}$ and $E^\circ_{Cu^{2+}/Cu} = +0.34\ \mathrm{V}$. What is the standard cell voltage?

Accepted Answer

$1.10\ \mathrm{V}$

Question 17

Using the Nernst equation, what happens to the cell potential if the concentration of $Cu^{2+}$ in a $Zn/Cu$ cell is decreased?

Accepted Answer

The cell potential decreases

Question 18

Which of the following is an alkene functional group?

Accepted Answer

A carbon-carbon double bond

Question 19

Which hydrocarbon is an isotope of ethane?

Accepted Answer

$C_2H_6$ with one $^{13}C$ atom

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