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CHEM 1212: Spring Term 2005
Practice Final
(CHM 1046 Fall 1997's Test)
Module Ten Chapter 16

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Module Ten

Module 10 Test Masters:

Mary Alcott (maliceall@juno.com)

Juliana C. Allebach (Ruuufie@aol.com)

John Taylor (jtaylor@hcc.cc.fl.us) [Consultant]


Multiple Choice [One Answer Only]

Question 1

Which of the following is true before a reaction reaches chemical equilibrium?

a) the rates of the forward and reverse reactions are increasing
b) the rates of the forward and reverse reactions are decreasing
c) the rates of the foward and reverse reactions are equal
d) the rate of the foward reaction is increasing; the rate of the reverse reaction is decreasing
e) the rate of the foward reaction is decreasing; the rate of the reverse reaction is increasing

Question 2

Which of the following is true before a reaction reaches chemical equilibrium?

a) ratef = increase [reactant] / unit of time
b) ratef = increase [product] / unit of time
c) ratef = decrease [product] / unit of time
d) all of the above
e) none of the above

Question 3

What is the general equilibrium constant expression, Keq, for the following reversible reaction :
A + 3B -> 2C?

a) Keq = [A]0 [B]3 / [C]0
b) Keq = [A]1 [B]3 / [C]2
c) Keq = [C]2 / [A]0 [B]3
d) Keq = [C]2 / [A]1 / [B]3
e) none of the above

Question 4

What is the general equilibrium constant expression, Keq, for the following reversible reaction :
2A + 3B --> 4C + D?
a) Keq =[A]2 [B]3 / [C]4 [D]0
b) Keq =[A]2 [B]3 / [C]4 [D]1
c) Keq =[C]4 [D]0 / [C]2 [B]3
d) Keq =[C]4 [D]1 / [C]2[B]3
e) none of the above

Question 5

What is the equilibrium constant expression for the following reaction?
2 N2O5(g) <--> 4 NO2(g) + O2(g)

a) Kc = [N 2O5]2 / [NO2]4 [O2]
b) Kc = [N 2O5]2 / [NO2]4 [O2]2
c) Kc = [NO2]4 [O2] / [N2O5]2
d) Kc = [NO2]4 [O2]2 / [N2O5]2
e) none of the above

Question 6

What is the equilibrium constant expression for the following reaction?
C(s) + CO2(g) < --> 2CO(g)

a) Kc = [Co] / [CO2]
b) Kc = [Co] / [C] [CO2]
c) Kc = [Co] / [Co2]
d) Kc = [CO]2 / [C] [CO2]
e) none of the above

Question 7

Ultraviolet light converts oxygen in the upper atmosphere to ozone. Calculate Kc for the reaction given the equilibrium concentrations of each gas at 20o C:
[O2] = 9.38 x 10-3 and [O3] = 3.4 x 10-15 3 O2(g) <--> 2 O3(g)

a) Kc = 4.11 x 10-28
b) Kc = 1.40 x 10-23
c) Kc = 3.62 x 10-13
d) Kc = 2.43 x 108
e) Kc = 7.14 x 1022

Question 8

A 0.500 M sample of phosgene gas, COCl2, is placed in a cylinder at 500oC and decomposed to give carbon monoxide and chlorine gases. If the equilibrium concentration of Cl2 is 0.045 M, what is Kc for the reaction?
COCl2(g) <--> CO(g) + Cl2(g)

a) Kc = 0.0041
b) Kc = 0.0045
c) Kc = 0.099
d) Kc = 220
e) Kc = 250

Question 9

Which of the changes listed below will shift the equilibrium to the right for the following reversible reaction?
SO3(g) + NO(g) + heat <--> SO2(g) + NO2(g)

a) increase [SO3]
b) increase [SO2]
c) decrease temperature
d) increase volume
e) add a catalyst

Question 10

Which of the changes listed below has no effect on the equilibrium for the following reversible reaction?
2 NO(g) + 2 CO(g) <--> N2(g) + 2 CO2(g) + heat

a) increase [NO]
b) decrease [CO2]
c) decrease temperature
d) increase volume
e) add a catalyst

Question 11

What is the term for a dynamic state of a reversible reaction in which the rate of the forward reaction is equal to the rate of the reverse reaction?

a) rate equation
b) chemical equilibrium
c) dissociation
d) rate of reaction
e) ionization

Question 12

What is the term for the relationship: Keq = [C]c [D]d / [A]a [B]b?

a) concentration equilibrium constant expression
b) general equilibrium constant expression
c) heterogeneous equilibrium constant expression
d) homogeneous equilibrium constant expression
e) ionization equilibrium constant expression

Question 13

What is the term for a type of chemical equilibrium in which one or more of the participating species is in a different physical state?

a) concentration equilibrium
b) heterogeneous equilibrium
c) homogeneous equilibrium
d) physical equilibrium
e) none of the above

Question 14

What is the term for a type of chemical equilibrium in which all of the participating species are in the same physical state?
a) concentration equilibrium
b) heterogeneous equilibrium
c) homogeneous equilibrium
d) physical equilibrium
e) none of the above

Question 15

Which of the changes listed below will shift the equilibrium to the right for the following reversible reaction?
CO(g) + H2O(g) <--> CO2(g) + H2(g) + heat
a) increase [CO]
b) increase [CO2]
c) increase temperature
d) increase volume
e) add a catalyst


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