AnswersCrowley Original Credit Chemistry BNeutralization Reactions

Neutralization Reactions — Cumulative exam Answers

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21
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Which statement correctly describes a reaction in dynamic equilibrium?

A
At dynamic equilibrium, the reactions stop and the amounts of reactants and products do not change.
B
At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
C
At dynamic equilibrium, the reactions stop but the amounts of reactants and products are changing.
D
At dynamic equilibrium, the reactions continue and the amounts of reactants and products are changing.
22
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Consider the general reversible reaction.What is the equilibrium constant expression for the given system?

Question illustration
A
K e q equals StartFraction lowercase C StartBracket upper C EndBracket lowercase d StartBracket upper D EndBracket over lowercase A StartBracket upper A EndBracket lowercase B StartBracket upper B EndBracket EndFraction.
Option A
B
K e q equals StartFraction StartBracket upper C EndBracket StartBracket upper D EndBracket over StartBracket upper A EndBracket StartBracket upper B EndBracket EndFraction.
Option B
C
K e q equals StartFraction StartBracket upper A EndBracket superscript lower a StartBracket upper B EndBracket superscript lower b over StartBracket upper C EndBracket superscript lower c StartBracket upper D EndBracket superscript lower D EndFraction.
Option C
D
K e q equals StartFraction StartBracket upper C EndBracket superscript lower c StartBracket upper D EndBracket superscript lower D over StartBracket upper A EndBracket superscript lower a StartBracket upper B EndBracket superscript lower b EndFraction.
Option D
23

Which of these correctly defines the pH of a solution?

A
the negative log of the hydronium ion concentration
B
the log of the hydronium ion concentration
C
the negative log of the hydroxide ion concentration
D
the log of the hydroxide ion concentration
24

Which represents the correct equilibrium constant expression for the reaction below?

Question illustration
A
K e q equals StartFraction StartBracket upper C u EndBracket StartBracket upper A g superscript plus EndBracket superscript 2 over StartBracket upper C us superscript 2 plus EndBracket StartBracket upper A g EndBracket superscript 2 EndFraction.
Option A
B
K e q equals StartFraction StartBracket upper C u superscript 2 plus EndBracket StartBracket upper A g EndBracket superscript 2 over StartBracket upper C u EndBracket StartBracket upper A g superscript plus EndBracket superscript 2 EndFraction.
Option B
C
K e q equals StartFraction StartBracket upper A g superscript plus EndBracket superscript 2 over StartBracket upper C u superscript 2 plus EndBracket EndFraction.
Option C
D
K e q equals StartFraction StartBracket upper C u superscript 2 plus EndBracket over StartBracket upper A g superscript plus EndBracket superscript 2 EndFraction.
Option D
25

Which describes an alkaline solution?

A
pH less than 7
B
pH equal to 7
C
basic
D
acidic
26

What is the net ionic equation for the reaction that is represented by the following total ionic equation?

Question illustration
A
2 upper N a subscript 3 upper P upper O subscript 4 plus 3 upper C a upper C l subscript 2 right arrow 6 upper N a upper C l plus upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option A
B
2 upper P upper O subscript 4 superscript 3 minus, plus 3 upper C a superscript 2 plus right arrow upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option B
C
2 upper P upper O subscript 4 superscript 3 minus, plus 3 upper C a superscript 2 plus, plus 6 upper C l superscript minus right arrow 6 upper N a superscript plus, upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option C
D
2 upper P superscript 5 plus, plus 8 upper O superscript 2 minus, plus 3 upper C a superscript 2 plus right arrow upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option D
27

Which reaction displays an example of an Arrhenius base?

A
NaOH(s) Na+(aq) + OH–(aq)
Option A
B
HCl(g) + H2O(l) H3O+(aq) + Cl–(aq)
Option B
C
CH3COOH(aq) + H2O(l) H3O+(aq) + CH3COO–(aq)
Option C
D
NH3(aq) + HC2H3O2(aq) NH4+(aq) + C2H3O2–(aq)
Option D
28

Note the pH and pOH values labeled with letters on the pH scale below.Based on log rules and the way pH is calculated, what is the difference in [OH– ] concentration between point A and point B.

Question illustration
A
101
B
105
C
106
D
107
29

Which lists all of the substances that appear in equilibrium constant expressions?

A
pure gas and pure liquid
B
pure gas and aqueous solution
C
pure solid and pure liquid
D
aqueous solution and pure liquid
30

Which is true about the dissolving process in water?

A
Nonpolar solutes dissolve easily in water.
B
Solute molecules surround water molecules.
C
Molecules or ions of a solute spread throughout the water molecules.
D
Water molecules are repelled by solute ions at the surface of the solute.
31

How can the pH of a solution be calculated if the pOH is known?

A
by taking the negative logarithm of pOH
B
by adding the pOH to 14
C
by raising 10 to the power of –pOH
D
by subtracting the pOH from 14
32

In the atmosphere, under the effect of ultraviolet rays, oxygen molecules combine to form ozone molecules, and ozone molecules also photodissociate to form oxygen molecules. Which of the following would be observed if this reaction is in dynamic equilibrium?

A
The concentration of oxygen will increase.
B
The concentration of ozone will decrease.
C
The rates of the forward and reverse reactions will increase.
D
The rates of the forward and reverse reactions will remain the same.
33

Hydrogen gas reacts rapidly with oxygen gas in the presence of a platinum catalyst. Which equation correctly represents this reaction?

A
Upper H subscript 2 (g) plus upper O subscript 2 (g) plus upper P t right arrow upper H subscript (g) plus upper O subscript 2 (g).
Option A
B
Upper H subscript 2 (g) plus upper O subscript 2 (g) right arrow upper H subscript 2 (g) plus upper O subscript 2 (g) plus upper P t.
Option B
C
2 upper H subscript 2 (g) plus upper O subscript 2 (g) right arrow with upper P t above it, 2 upper H subscript (g) plus upper O subscript 2 (g) plus upper P t.
Option C
D
2 upper H subscript 2 (g) plus upper O subscript 2 (g) right arrow with upper P t above it, 2 upper H subscript (g) plus upper O subscript 2 (g).
Option D
34

Which statement correctly defines dynamic equilibrium?

A
At dynamic equilibrium, the rates of forward and reverse reactions are equal.
B
At dynamic equilibrium, the rate of the forward reaction is higher than the rate of the reverse reaction.
C
At dynamic equilibrium, the forward and reverse reactions stop.
D
At dynamic equilibrium, the concentrations of reactants and products are equal.
35

Based on the definition of logarithms, what is the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3?

A
A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.
B
A substance with a pH of 3 has a 10 times higher concentration of H+ than a substance with a pH of 2.
C
A substance with a pH of 2 has a 100 times higher concentration of H+ ions than a substance with a pH of 3.
D
A substance with a pH of 3 has a 100 times higher concentration of H+ ions than a substance with a pH of 2.
36

Consider the reaction.At equilibrium, the concentrations of the different species are as follows.[NH3] = 0.105 M[N2] = 1.1 M[H2] = 1.50 MWhat is the equilibrium constant for the reaction at this temperature?

Question illustration
A
0.0030
B
0.030
C
34
D
340
37

What is the definition of a Lewis acid?

A
a substance that accepts electrons to form a covalent bond
B
a substance that donates electrons to form a covalent bond
C
a substance that accepts a proton
D
a substance that donates a proton
38

The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change?

A
increases to 2 times the original concentration
B
increases to 100 times the original concentration
C
decreases to of the original concentration
Option C
D
decreases to of the original concentration
Option D
39

Solute crystals are added to a solution until they begin to sink to the bottom of their container. The solution is then heated, and many more solute crystals dissolve. Which term best describes the solution immediately after it was heated?

A
saturated
B
unsaturated
C
concentrated
D
supersaturated
40

The pOH of a solution is 10.75. What is the concentration of OH– ions in the solution?Use .

Question illustration
A
3.162 10–108 M
Option A
B
1.778 10–11 M
Option B
C
1.075 102 M
Option C
D
5.623 1010 M
Option D

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