Q: Which of the following is the correct equation for the free energy change of a cell reaction?

$$\Delta G^\circ = -nFE^\circ_{\text{cell}}$$

Q: A reaction mechanism consists of the following steps: $$\text{NO}(g) + \text{NO}(g) \rightleftharpoons \text{N}_2\text{O}_2(g) ($$fast, equilibrium), $$\text{N}_2\text{O}_2(g) + \text{H}_2(g) \rightarrow \text{H}_2\text{O}(g) + \text{N}_2\text{O}(g) ($$slow), $$\text{N}_2\text{O}(g) + \text{H}_2(g) \rightarrow \text{N}_2(g) + \text{H}_2\text{O}(g) ($$fast). What is the rate law for the overall reaction?

$$\text{rate} = k[NO]^2[H_2$]$$

Q: Which of the following is the correct standard cell notation for the reaction $$2\text{H}^+(aq) + 2\text{Ag}(s) \rightarrow \text{H}_2(g) + 2\text{Ag}^+(aq)$$?

$$\text{Ag}(s) | \text{Ag}^+(aq) || \text{H}^+(aq) | \text{H}_2(g)$$

Question 1

A reaction has a rate law given by $$	ext{rate} = k[A]^2[B]. If $$the concentration of A is doubled and B is tripled, by what factor does the reaction rate increase?

Accepted Answer

The rate increases by a factor of 18.

Question 2

Which of the following statements about catalysts is TRUE?

Accepted Answer

Catalysts provide an alternative pathway with lower activation energy.

Question 3

For the reaction $$2A(g) + B(g) ightarrow C(g)$$, the rate law is $$	ext{rate} = k[A]^3. $$What are the units of the rate constant k?

Accepted Answer

$$	ext{M}^{-2}	ext{s}^{-1}$$

Question 4

A student mixes 0.50 M of reactant X and 0.50 M of reactant Y. The reaction is first order in X and zero order in Y. What is the rate law?

Accepted Answer

$$	ext{rate} = k[X]$$

Question 5

Which of the following is NOT a characteristic of a galvanic cell?

Accepted Answer

The cell requires an external power source to operate.

Question 6

In the reaction $$	ext{Zn}(s) + 	ext{Cu}^{2+}(aq) ightarrow 	ext{Zn}^{2+}(aq) + 	ext{Cu}(s)$$, what is the direction of electron flow?

Accepted Answer

From Zn to Cu

Question 7

A reaction has an activation energy of 80 kJ/mol. If the temperature is increased, what happens to the rate constant according to the Arrhenius equation?

Accepted Answer

The rate constant increases.

Question 8

Which of the following is the correct formula for calculating the equilibrium constant $$K_p$$ from $$K_c$$?

Accepted Answer

$$K_p = K_c \cdot (RT$$)^{\Delta n}$$

Question 9

A solution contains 0.10 M Ag$$^+$$ and 0.10 M Cu$$^{2+}. $$Using the standard reduction potentials $$E^\circ_{	ext{Ag}^+/	ext{Ag}} = +0.80 V $$and $$E^\circ_{	ext{Cu}^{2+}/	ext{Cu}} = +0.34 V$$, which metal will be reduced at the cathode in a galvanic cell?

Accepted Answer

Ag$$^+$$

Question 10

Which of the following best describes the role of the salt bridge in a galvanic cell?

Accepted Answer

It maintains electrical neutrality by allowing ion migration.

Question 11

A first order reaction has a half-life of 30 seconds. What fraction of the reactant remains after 90 seconds?

Accepted Answer

1/8

Question 12

Which of the following is the correct equation for the free energy change of a cell reaction?

Accepted Answer

$$\Delta G^\circ = -nFE^\circ_{	ext{cell}}$$

Question 13

In the reaction $$	ext{MnO}_4^-(aq) + 	ext{SO}_3$$^{2-}$$(aq) ightarrow 	ext{MnO}_2(aq) + 	ext{SO}_4$$^{2-}$$(aq)$$, which species is oxidized?

Accepted Answer

SO$$_3$$^{2-}$$

Question 14

A student is asked to balance the following reaction in acidic solution: $$	ext{P}(s) + 	ext{Cu}^{2+}(aq) ightarrow 	ext{Cu}(s) + 	ext{H}_2	ext{PO}_4^-(aq). $$What is the coefficient of H$$_2O in $$the balanced equation?

Accepted Answer

4

Question 15

Which of the following statements about oxidation numbers is correct?

Accepted Answer

The oxidation number of sulfur in KHSO$$_4 is +6.$$

Question 16

Which of the following is NOT true about substances that are oxidized?

Accepted Answer

They decrease in oxidation state.

Question 17

A reaction mechanism consists of the following steps: $$	ext{NO}(g) + 	ext{NO}(g) ightleftharpoons 	ext{N}_2	ext{O}_2(g) ($$fast, equilibrium), $$	ext{N}_2	ext{O}_2(g) + 	ext{H}_2(g) ightarrow 	ext{H}_2	ext{O}(g) + 	ext{N}_2	ext{O}(g) ($$slow), $$	ext{N}_2	ext{O}(g) + 	ext{H}_2(g) ightarrow 	ext{N}_2(g) + 	ext{H}_2	ext{O}(g) ($$fast). What is the rate law for the overall reaction?

Accepted Answer

$$	ext{rate} = k[NO]^2[H_2$]$$

Question 18

Which of the following is the correct standard cell notation for the reaction $$2	ext{H}^+(aq) + 2	ext{Ag}(s) ightarrow 	ext{H}_2(g) + 2	ext{Ag}^+(aq)$$?

Accepted Answer

$$	ext{Ag}(s) | 	ext{Ag}^+(aq) || 	ext{H}^+(aq) | 	ext{H}_2(g)$$

Question 19

In an electrolytic cell containing molten NaCl and NaBr, which species is oxidized at the anode during electrolysis?

Accepted Answer

Cl$$^-$$

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