AnswersIA-Chemistry A Survey of Chemistry AShifts in Equilibrium

Shifts in Equilibrium — Unit test Answers

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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?

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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
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What is the percent by mass of water in Na2SO4 • 10H2O?Use .

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A
5.59%
B
11.26%
C
44.08%
D
55.92%
3

Consider the chemical equation in equilibrium. A(g) + 2B(g) C(g) + D(g) + heat What will happen to the equilibrium of this reaction if the temperature is increased?

Question illustration
A
It will shift to the left because heat is released.
B
It will shift to the left because heat is absorbed.
C
It will shift to the right because heat is released.
D
It will shift to the right because heat is absorbed.
4

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
5

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.
6

According to Le Chatelier’s principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition?

A
The reactants and the products are in the solid phase.
B
The reactants and the products are in the liquid phase.
C
Some of the reactants or the products are in the gaseous phase.
D
Some of the reactants or the products are solid, and some are liquid.
7

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?

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A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
8

Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction?

A
sodium hydroxide + water sodium + hydrogen
Option A
B
sodium + water sodium hydroxide + hydrogen
Option B
C
sodium + hydrogen sodium hydroxide + water
Option C
D
sodium + sodium hydroxide water + hydrogen
Option D
9

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.
10

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
11

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.
12

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.
13

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?

A
oxygen + lithium oxide lithium
Option A
B
lithium + oxygen lithium oxide
Option B
C
oxygen + lithium lithium + oxide
Option C
D
lithium oxide lithium + oxygen
Option D
14

According to Le Chatelier’s principle, what happens when the concentration of a product is reduced in a chemical reaction that was in equilibrium?

A
The equilibrium shifts to the right to favor the formation of products.
B
The equilibrium shifts to the left to favor the formation of reactants.
C
The equilibrium shifts in the exothermic direction.
D
The equilibrium shifts in the endothermic direction.
15

In which two types of reactions do opposite chemical changes occur?

A
double replacement and combustion
B
single replacement and double replacement
C
synthesis and decomposition
D
combustion and synthesis

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