Question 1

A solution is prepared by dissolving 58.5 g of NaCl in enough water to make 1.00 L of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.5 g/mol)

Accepted Answer

$1.00\ \mathrm{M}$

Question 2

Which of the following best explains why salt is spread on icy roads in winter?

Accepted Answer

Salt decreases the freezing point of water, causing ice to melt.

Question 3

Which equation correctly represents the calculation for boiling point elevation?

Accepted Answer

$\Delta T_b = K_b \cdot m \cdot i$

Question 4

A reaction is found to be first order with respect to reactant A. If the concentration of A is doubled, what happens to the rate of the reaction?

Accepted Answer

The rate doubles.

Question 5

Which of the following is the correct expression for the equilibrium constant $K_c$ for the reaction: $2\mathrm{NO}_2(g) \rightleftharpoons 2\mathrm{NO}(g) + \mathrm{O}_2(g)$?

Accepted Answer

$K_c = \dfrac{[\mathrm{NO}]^2[\mathrm{O}_2]}{[\mathrm{NO}_2]^2}$

Question 6

If the temperature of an exothermic reaction at equilibrium is increased, what will happen to the amount of products, according to Le Chatelier's Principle?

Accepted Answer

The amount of products will decrease.

Question 7

Which of the following pairs is a conjugate acid-base pair?

Accepted Answer

$\mathrm{NH}_3$ and $\mathrm{NH}_4^+$

Question 8

A buffer solution is prepared by mixing equal concentrations of acetic acid and sodium acetate. What will happen to the pH if a small amount of HCl is added?

Accepted Answer

The pH will decrease slightly.

Question 9

Which of the following salts will produce a basic solution when dissolved in water?

Accepted Answer

$\mathrm{NaCH}_3\mathrm{COO}$

Question 10

Which of the following is the correct formula for calculating the standard Gibbs free energy change ($\Delta G^\circ$) at 25°C?

Accepted Answer

$\Delta G^\circ = \Delta H^\circ - T\Delta S^\circ$

Question 11

Which of the following statements about spontaneous reactions is correct?

Accepted Answer

A spontaneous reaction has a negative $\Delta G$.

Question 12

Which of the following is a correct half-reaction for the reduction of copper(II) ion in an electrochemical cell?

Accepted Answer

$\mathrm{Cu}^{2+} + 2e^- \rightarrow \mathrm{Cu}$

Question 13

Which of the following best describes the function of a catalyst in a chemical reaction?

Accepted Answer

It lowers the activation energy.

Question 14

Which of the following nuclear reactions is an example of alpha decay?

Accepted Answer

$^{238}\mathrm{U} \rightarrow ^{234}\mathrm{Th} + ^{4}\mathrm{He}$

Question 15

Which of the following functional groups is present in the structure below?

$\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{C}$
$\quad |$
$\mathrm{C}$

Accepted Answer

Branched alkane

Question 16

Which of the following statements about intermolecular forces is correct?

Accepted Answer

London dispersion forces are present in all molecules.

Question 17

A reaction has an activation energy of $50\ \mathrm{kJ/mol}$ without a catalyst and $20\ \mathrm{kJ/mol}$ with a catalyst. What is the effect of the catalyst on the reaction rate?

Accepted Answer

The catalyst increases the reaction rate.

Question 18

Which of the following is the correct nuclear equation for the beta decay of $^{14}\mathrm{C}$?

Accepted Answer

$^{14}\mathrm{C} \rightarrow ^{14}\mathrm{N} + e^-$

Question 19

Which of the following best describes the effect of increasing temperature on the solubility of a gas in water?

Accepted Answer

The solubility decreases.

Question 20

Which of the following is the correct IUPAC name for the compound shown below?

$\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$

Accepted Answer

Butane

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