AnswersMO-Physical Science A-CRShifts in Equilibrium

Shifts in Equilibrium — Unit test Answers

15 verified answers
1
Free Preview

Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. HC2H3O2(aq) H+(aq) + C2H3O2–(aq)yellow blue What will be the color of the solution if a large amount of H2CO3 is added?

Question illustration
A
The solution will remain yellow.
B
The solution will turn blue.
C
The solution will turn pink.
D
The solution will turn green.
2
Free Preview

Error

Answer not available
3

Which statement best describes how dynamic equilibrium relates to a saturated solution of sodium chloride?

A
The concentration of the dissolved particles remains constant.
B
No more solid dissolves in a saturated solution.
C
Each second, the amount of solid sodium chloride that dissolves equals the amount of solid sodium chloride that recrystallizes.
D
Each second, solid sodium chloride dissolves and solid sodium chloride recrystallizes.
4

In the hypothetical reaction below, substance A is consumed at a rate of 2.0 mol/L·s. If this reaction is at dynamic equilibrium, at what rate will substance B be consumed?A B

Question illustration
A
0.0 mol/L·s
B
1.0 mol/L·s
C
2.0 mol/L·s
D
4.0 mol/L·s
5

Which statement is usually true about the relationship between activation energy and reaction rates?

A
Low activation energy barriers result in low rates.
B
High activation energy barriers result in low rates.
C
Low activation energy barriers result in no reaction.
D
High activation energy barriers result in no reaction.
6

Which is true about reaction rates?

A
High reaction rates occur only in spontaneous reactions.
B
Low reaction rates occur only in nonspontaneous reactions.
C
Reaction rates are not dependent on high or low activation energies.
D
Reaction rates are not related to spontaneity.
7

Which definition describes activation energy?

A
the speed at which reactants form products in a chemical reaction
B
the short-lived, high-energy intermediate between reactants and products
C
the diagram showing a change in energy between reactants and products
D
the minimum energy that a set of reactants must attain before reaction can occur
8

How does an increase in reactant concentration affect the rate of reaction?

A
It leads to more frequent collisions, which increase reaction rate.
B
It leads to less frequent collisions, which increase reaction rate.
C
It leads to more frequent collisions, which decrease reaction rate.
D
It leads to less frequent collisions, which decrease reaction rate.
9

The equation below shows a reaction that produces calcium carbonate.Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(l)Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster?

Question illustration
A
Lower the temperature.
B
Use larger pieces of calcium hydroxide.
C
Lower the pressure.
D
Reduce the volume of the container.
10

Consider the reaction below.H2(g) + CO2(g) H2O(g) + CO(g)At equilibrium at 600 K, the following are true. [CO2] = 9.5 x 10-4 M[H2] = 4.5 x 10-2 M[H2O] = 4.6 x 10-3 M[CO] = 4.6 x 10-3 MWhat is the value of the equilibrium constant for this reaction in correct scientific notation?

Question illustration
A
4.9 x 10-3
B
4.9 x 10-2
C
4.9 x 10-1
D
4.9 x 103
11

Error

Answer not available
12

Error

Answer not available
13

Consider the reaction.At 298 K, the equilibrium concentration of O2 is 1.6 x 10-2 M, and the equilibrium concentration of O3 is 2.86 x 10-28 M. What is the equilibrium constant of the reaction at this temperature?

Question illustration
A
mc018-2.jpg
Option A
B
mc018-3.jpg
Option B
C
mc018-4.jpg
Option C
D
mc018-5.jpg
Option D
14

Consider the reaction pathway graph below.What is represented by D in the graph?

Question illustration
A
the activation energy
B
the enthalpy of the reaction
C
the energy of the products
D
the energy of the reactants
15

What is the main reason that it takes 2 to 3 minutes for the reaction to occur between sucrose and sulfuric acid in the dehydration of sucrose?

A
The activation energy needs to be overcome in the reaction.
B
The activation energy must be removed from the intermediates.
C
The sulfuric acid has to be consumed before the reaction takes place.
D
The sucrose molecules must rearrange to become the catalyst.

Did you find these answers helpful?

More from this Course

Quiz
15 verified answers

Unit Test

Quiz
23 verified answers

Unit Test

Quiz
10 verified answers

Shifts in Equilibrium