Chemistry 1b Midterm 2 Worksheet With Answers Page 8

4. All of the following statements with respect to the effect of a catalyst on a reaction are

true except:

A) A catalyst speeds up a reaction by providing an alternate pathway for the reaction.

B) When a reaction is catalyzed, both forward and reverse reactions are accelerated.

C) When a catalyst speeds up a reaction, the rate law stays the same.

D) A catalyst provides a lower activation energy for the reaction.

E) A catalyst has no effect on the equilibrium composition of the reaction.

5. A concentration cell is constructed using two Ni electrodes with Ni

concentrations of

–4

1.26 M (cathode) and 4.95  10

M (anode) in the two half-cells. The reduction

is –0.23 V. Calculate the potential of the cell at 25°C.

potential of Ni

A) +0.101 V

B) +0.331 V

C) –0.201 V

D) –0.0287 V

E) –0.232 V

6. True of False. This (electrolysis) is when an electric current catalyzes a reaction.

A) True

B) False

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