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CHM 2046C: Spring Term 2008
Practice Final
(CHM 1046 Spring 1998's Test)
Module Nine Chapter 15

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Module Nine

Module 9 Test Masters:

Robert Wagner ( ) [Text Input]

John Taylor (johtaylo@fccj.edu) [Consultant]


Multiple Choice [One Answer Only]

Question 1

    Use the information below to determine the overall order of the reaction.

A + B --> P

Trial [A],M [B],M Rate
1 0.273 0.763 2.83
2 0.273 1.526 2.83
3 0.819 0.763 25.47

 

a) 1
b) 2
c) 3
d) 4
e) 5


Question 2

If the reaction 2A + 3D --> products is first-order in A and second-order in D, then the rate law will have the form, rate =

a) k [A] [D]
b) k [A]2 [D]3
c) k [A] [D]2
d) k [A]2 [D]
e) k [A]2 [D]2


Question 3

Given the initial-rate data below for the reaction, mM + zZ --> products, the correct rate law is rate =

 

Initial Conc. (M) Reactants
Expt.

[M]

[Z]

 Rate (mol2 /L2 s)
1 0.100 0.100 4.0 x 10-5
2 0.200 0.100 1.6 x 10-4
3 0.200 0.200 8.0 x 10-5

a) k [M] [Z]
b) k [M]2 [Z]
c) k [M]2 [Z]2
d) k [M] [Z]2
e) k [M]4 [Z]2


Question 4

Select the rate law that corresponds to the data shown for the following reaction.

2A + 3B --> 2C

 

Experiment Initial [A] Initial [B] Initial Rate
1 0.15 0.12 0.10
2 0.15 0.24 0.20
3 0.45 0.24 1.80

a) R = k [A]3 [B]
b) R = k [A]3
c) R = k [A]2 [B]2
d) R = k [A]2 [B]

Question 5

The reaction rate constant  for a particular second order reaction is 0.47 L/mol · s.  If the initial concentration of reactant is 0.25 mol · L, how many seconds will it take for the concentration to decrease to 0.13 mol · L?

a) 7.9
b) 1.4
c) 3.7
d) 1.7

Question 6

Reaction rate depends on:

a) collision frequency
b) collision energy
c) collision orientation
d) all of these

Question 7

In the diagram below, which measurement corresponds to the activation energy for the forward reaction?

a) X
b) Y
c) Z

Question 8

    In the diagram below, which measurement corresponds to the heat of reaction?

a) X
b) Y
c) Z

Question 9

The reaction diagrammed below is:

a) endothermic
b) exothermic

Question 10

Consider the following reaction and its associated rate law.

A + B --> C     R = k [A]2

 

Which of the following will not increase the rate of the reaction?

a) increasing the concentration of reactant A
b) increasing the concentration of reactant B
c) increasing the temperature of the reaction
d) adding a suitable catalyst

Question 11

As the temperature of a reaction is increased, the rate of the reaction increases because the:

a) reactant molecules collide less frequently
b) reactant molecules collide with greater energy
c) activation energy is lowered
d) reactant molecules collide less frequently and with greater energy

Question 12

What is the intermediate in the following mechanism?

A + B -> C + D

B + D -> X

a) A
b) B
c) C
d) D
e) X

Question 13

Each of the choices below gives a reaction and the corresponding rate law.  Of these choices, which one could be an elementary process?

a) 2A    -> P        rate = k [A]
b) A + B -> P    rate = k [A] [B]
c) A + 2B -> P    rate = k [A]2
d) A + B + C -> P    rate = k [A] [C]

Question 14

Given the following mechanism, which species below may be classified as intermediates in the formation of XO2 from X and O2?

X + YO2 -> XO + YO

XO + YO -> XO2 + YO

YO + O2 -> YO + O

YO + O -> YO2

a) X only
b) YO only
c) both X and YO2
d) both XO and YO
e) both YO2 and O2

Question 15

A possible mechanism for the reaction Br2 + 2NO --> 2NOBr is shown below. The proper form of its rate law should be rate =

   2NO    <======k1 / k-1====>    N2 O2        fast, equilibrium

N2O2 + Br2 --> 2NOBr         slow              

a) k1 [NO]0.5
b) k1 [Br2]0.5
c) (k2k1/k-1) [NO]2 [Br2]
d) (k1/k-1)2 [NO]2
e) (k2k1/k-1) [NO] [Br2]2

Question 16

Which line in the reaction profile corresponds to the activation energy for the forward reaction?

a) w
b) x
c) y
d) z

Question 17

In any multistep reaction mecanism, the rate of the overall reaction is determined by the rate of the _____ step in the mechanism.

a) first
b) last
c) slowest
d) fastest

Question 18

Consider the following hypothetical chemical reaction.

A + 2B --> E

The mechanism for this reaction is

1) 2A + B --> C    (slow)

2)B + C --> D    (fast)

3)        D --> E    (fast)

Which one of the following is the correct rate law for this reaction?

a) Rate = k [A] [B]
b) Rate = k [A] [E]
c) Rate = k [A]2 [B]
d) Rate = k [D] [B]

Question 19

Given the following mechanism, which of the species below is a catalyst in the formation of XO2 from X and O2?

X + YO2 --> XO + YO

XO +  YO2 -->  XO2 + YO

YO +  O2 -->  YO2 + O

YO + O -->  YO2

a) X
b) O2
c) YO2
d) XO
e) XO2

Question 20

Chlorine atoms photochemically derived from Freons help destroy stratospheric ozone in the two-step mechanism below. We classify the respective species Cl and ClO for the overall balanced reaction as:

Cl + O3 --> ClO + O2

ClO + O --> Cl + O2

a) both catalysts
b) both intermediates
c) catalyst and intermediate
d) intermediate and catalyst
e) both activated complexes



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