4/25/2016

Week Two

Week Two
Due: 2:59am on Tuesday, May 3, 2016
You will receive no credit for items you complete after the assignment is due. Grading Policy

Exercise 13.21

Part A
Explain the difference between homogeneous catalysis and heterogeneous catalysis.
ANSWER:
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)

Exercise 13.78
Suppose that the reaction

is exothermic and has an activation barrier of 75

.

Part A
Indentify an energy diagram showing the energy of the reaction as a function of the progress of the reaction.
ANSWER:

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

1/11

4/25/2016

Week Two

Part B
This question will be shown after you complete previous question(s).

Exercise 13.100
Consider the following two reactions:

Part A
Can you suggest why the activation barrier for the first reaction is so much higher than that for the second?
ANSWER:
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)

Part B
The frequency factors for these two reactions are very close to each other in value. Assuming that they are the same, compute the ratio of the reaction rate constants for these two reactions at 25 .
ANSWER:
=

Exercise 13.24

Part A
What is the general two­step mechanism by which most enzymes work?
ANSWER:
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)

Exercise 14.5

Part A
What happens to the value of the equilibrium constant for a reaction if the reaction equation is reversed? Multiplied by a constant?
ANSWER:

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

2/11

4/25/2016

Week Two

Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)

Exercise 14.22
Find and fix each mistake in the following equilibrium constant expressions.

Part A

ANSWER:

Part B

ANSWER:

Exercise 14.24

Part A
Ethene

can be halogenated by the following reaction: where can be (green), (brown), or (purple). Examine the three figures below representing equilibrium concentrations in this reaction at the same temperature for the three different halogens. Rank the equilibrium constants for these three reactions from largest to smallest .
Rank from largest to smallest. To rank items as equivalent, overlap them.

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

3/11

4/25/2016

Week Two

ANSWER:

Exercise 14.34

Part A
Find the mistake in the following equilibrium expression and fix it.

ANSWER:

Exercise 14.10

Part A
Does the value of the equilibrium constant depend on the initial concentrations of the reactants and products?
ANSWER:

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

4/11

4/25/2016

Week Two

yes no Part B
Do the equilibrium concentrations of the reactants and products depend on their initial concentrations?
ANSWER:
yes no Exercise 14.14
In what direction will a reaction proceed for each condition?

Part A

ANSWER: the reaction goes to the right (toward products) the reaction goes to the left (toward reactants) the reaction is at equilibrium

Part B

ANSWER: the reaction goes to the right (toward products) the reaction goes to the left (toward reactants) the reaction is at equilibrium

Part C

ANSWER: the reaction goes to the right (toward products) the reaction goes to the left (toward reactants) the reaction is at equilibrium

Exercise 14.18

Part A
What is the effect of a change in concentration of a reactant or product on a chemical reaction initially at equilibrium?
Drag the appropriate items to their respective bins.
ANSWER:
https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

5/11

4/25/2016

Week Two

Exercise 14.30

Part A
Use the reactions below and their equilibrium constants to predict the equilibrium constant for the reaction,

.

ANSWER: =

Exercise 14.46
Consider the following reaction:

A reaction mixture contains 0.112

of

, 0.055

of

, and 0.445

of

.

×

Part A
Is the reaction mixture at equilibrium? If not, in what direction will the reaction proceed?
ANSWER:
The system is at equilibrium.
The system is not at equilibrium, the reaction will shift to the left to reach equilibrium.
The system is not at equilibrium, the reaction will shift to the right to reach equilibrium.

Exercise 14.62
Consider the following reaction at equilibrium: https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

6/11

4/25/2016

Week Two

Predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances.

Part A is added to the reaction mixture.
ANSWER:
the reaction will shift left the reaction will shift right the reaction will remain unchanged

Part B is added to the reaction mixture.
ANSWER:
the reaction will shift left the reaction will shift right the reaction will remain unchanged

Part C is removed from the reaction mixture.
ANSWER:
the reaction will shift left the reaction will shift right the reaction will remain unchanged

Exercise 14.28
×

The reaction below has an equilibrium constant

at 298

Part A
Calculate

for the reaction below.

Express your answer using two significant figures.
ANSWER:
=

Part B
Predict whether reactants or products will be favored at equilibrium in the equation above.
ANSWER:
Reactants will be favored at equilibrium.
Products will be favored at equilibrium.

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

7/11

4/25/2016

Week Two

Part C
Calculate

for the reaction below.

Express your answer using two significant figures.
ANSWER:
=

Part D
Predict whether reactants or products will be favored at equilibrium in the equation above.
ANSWER:
Reactants will be favored at equilibrium.
Products will be favored at equilibrium.

Part E
Calculate

for the reaction below.

Express your answer using two significant figures.
ANSWER:
=

Part F
Predict whether reactants or products will be favored at equilibrium in the equation above.
ANSWER:
Reactants will be favored at equilibrium.
Products will be favored at equilibrium.

Exercise 14.36
Consider the following reaction: An equilibrium mixture of this reaction at a certain temperature was found to have

0.286

and

0.370

.

Part A
What is the value of the equilibrium constant

at this temperature?

ANSWER: =

Exercise 14.42
Consider the following reaction: A reaction mixture is made containing an initial

of 2.2×10−2

. At equilibrium,

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

1.3×10−2

.
8/11

4/25/2016

Week Two

Part A
Calculate the value of the equilibrium constant

.

Express your answer using two significant figures.
ANSWER:
=

Exercise 14.19

Part A
What is the effect of a change in volume on a chemical reaction (that includes gaseous reactants or products) initially at equilibrium?
ANSWER:
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)

Exercise 14.20

Part A
What is the effect of a temperature change on a chemical reaction initially at equilibrium? How does the effect differ for an exothermic reaction compared to an endothermic one?
ANSWER:
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)

Exercise 14.52
For the following reaction,

= 255 at 1000 . A reaction mixture initially contains a concentration of 0.1470

and a

concentration of 0.178

at 1000

.

Part A
What is the equilibrium concentration of

at 1000

?

Express your answer in molarity to three significant figures.
ANSWER:
=

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

9/11

4/25/2016

Week Two

Part B
What is the equilibrium concentration of

at 1000

?

Express your answer in molarity to three significant figures.
ANSWER:
=

Part C
What is the equilibrium concentration of

at 1000

?

Express your answer in molarity to three significant figures.
ANSWER:
=

Exercise 14.66
Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. Predict the effect (shift right, shift left, or no effect) of the indicated volume change.

Part A (volume is decreased)
ANSWER:
shift right shift left no effect

Part B (volume is increased)
ANSWER:
shift right shift left no effect

Part C (volume is increased)
ANSWER:
shift right shift left no effect

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

10/11

4/25/2016

Week Two

Exercise 14.68
The following reaction is exothermic. Predict the effect (shift right, shift left, or no effect) of increasing and decreasing the reaction temperature.

Part A
Predict the effect (shift right, shift left, or no effect) of increasing the reaction temperature.
ANSWER:
shift right shift left no effect

Part B
Predict the effect (shift right, shift left, or no effect) of decreasing the reaction temperature.
ANSWER:
shift right shift left no effect

Part C
How does the value of the equilibrium constant depend on temperature?
ANSWER:
increases when the temperature increases. decreases when the temperature increases. stays the same when the temperature increases.

Score Summary:
Your score on this assignment is 0.0%.
You received 0 out of a possible total of 4 points.

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4288291

11/11

try week 2