AnswersCrowley Original Credit Chemistry BNeutralization Reactions

Neutralization Reactions — Unit test Answers

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Soaps feel slippery on our hands because they dissolve the oil on our skin, decreasing friction.This is because soap contains

A
a neutral molecule.
B
a salt molecule.
C
an acid.
D
a base.
2
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A strong acid, HA, is added to water. Which statement about the solution is true?

A
It contains mostly hydroxide ions.
B
It contains almost no hydronium ions.
C
It contains little or no HA.
D
It contains a low amount of ions.
3

Which of these correctly defines the pOH of a solution?

A
the log of the hydronium ion concentration
B
the negative log of the hydronium ion concentration
C
the log of the hydroxide ion concentration
D
the negative log of the hydroxide ion concentration
4

The table below lists some acids and bases.Strong acidsWeak acidsWeak basesStrong basesHBrCH3COOHNH3NaOHHNO3HCOOHNH4OHKOHH2SO4 Ca(OH)2Which reaction yields a salt that has a pH < 7?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
5

An unknown substance turns blue litmus paper to red. Which additional test could be used to confirm the substance’s identity?

A
It should turn phenolphthalein from colorless to pink because it is a base.
B
It should turn phenolphthalein from pink to colorless because it is a base.
C
It should turn methyl orange to orange because it is an acid.
D
It should turn methyl orange to red because it is an acid.
6

Which description correctly characterizes the acidity or basicity of a solution?

A
The higher the pH is, the more the hydroxide ion concentration decreases and the more acidic the solution becomes.
B
The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.
C
The lower the pH is, the more the hydronium ion concentration decreases and the more acidic the solution becomes.
D
The lower the pH is, the more the hydronium ion concentration increases and the more basic the solution becomes.
7

Which of the following is the correctly balanced chemical equation for the reaction of Ca(OH)2 and HNO3?

A
Upper C a (upper O upper H) subscript 2 plus upper H upper N upper O subscript 3 right arrow upper C a superscript 2 plus, plus upper N upper O subscript 3 superscript minus.
Option A
B
Upper C a (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow 2 upper H subscript 2 upper O plus 2 upper N upper O subscript 3 superscript minus
Option B
C
Upper C a (upper O upper H) subscript 2 plus upper H upper N upper O subscript 3 right arrow upper H subscript 2 upper O plus upper C a upper N upper O subscript 3.
Option C
D
Upper C a (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow 2 upper H subscript 2 upper O plus UPper C a (upper N upper O subscript 3) subscript 2.
Option D
8

Which of these refers to the strength of an acid?

A
a measure of the quantity of acid dissolved in water designated by molarity
B
an intrinsic characteristic of a particular acid, not related to concentration
C
the amount of hydrogen ions present in the acid
D
the amount of hydroxide ions present in a solution
9

What is the definition of a Lewis base?

A
a substance that donates a proton
B
a substance that donates electrons to form a covalent bond
C
a substance that accepts electrons to form a covalent bond
D
a substance that when dissolved in water increases hydrogen ion concentration
10

Consider the reaction below.NH4+ + H2O NH3 + H3O+Which is an acid-conjugate base pair?

Question illustration
A
NH4+ and NH3
B
NH4+ and H3O+
C
H2O and NH3
D
H2O and H3O+
11

A solution of HCl has = 0.01 M. What is the pH of this solution?Use .

Question illustration
A
–2
B
–1
C
1
D
2
12

Consider the reaction below.Which is the net ionic equation for the reaction?

Question illustration
A
Upper H superscript plus, plus upper C l superscript minus right arrow upper H upper C l.
Option A
B
Upper N a superscript plus, plus upper C l superscript minus right arrow upper N a upper C l.
Option B
C
Upper N a superscript plus, plus upper C subscript 2 upper H subscript 3 upper o subscript 2 superscript minus (a q) plus upper H superscript plus, right arrow upper N a upper C subscript 2 upper H subscript 3 upper O subscript 2.
Option C
D
Upper C subscript 2 upper h subscript 3 upper O subscript 2 superscript minus (a q) plus upper H superscript plus right arrow upper H upper C subscript 2 upper H subscript 3 upper O subscript 2.
Option D
13

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?Useful formulas include , , , and .

Question illustration
A
1.58 10–12 M
Option A
B
6.31 10–3 M
Option B
C
2.20 M
D
158 M
14

Look at the diagram showing hydrochloric acid being added to water. Which statement best explains what is taking place?

Question illustration
A
A strong acid is disassociated completely, producing more conjugate base.
B
A strong base is disassociated completely, producing more conjugate acid.
C
Hydrogen is combining with chlorine to form more acid.
D
Hydrogen is combining with chlorine to form a strong base.
15

A salt is best described as a compound that is formed from the reaction between

A
an acid and a base.
B
a strong acid and a weak acid.
C
a strong base and a weak base.
D
an acid and water.
16

Which pair of substances would most likely result in the production of a gas when reacting with an acid?

A
litmus and methyl orange
B
base and salt
C
metal and carbonate
D
carbon dioxide and water
17

What does it mean for a strong base to be in equilibrium?

A
The position of equilibrium lies far to the right, with products being favored.
B
The position of equilibrium lies far to the left, with products being favored.
C
There is a great deal of base and very few ions.
D
There is an equal amount of reactants and products.
18

What type of substance reacts with limestone (CaCO3) and produces carbon dioxide gas?

A
a neutral substance
B
a base
C
an acid
D
both an acid and a base
19

Lewis acids and bases are most closely associated with which process?

A
proton transfer
B
electron transfer
C
the formation of aqueous ions
D
the formation of a conjugate acid or base
20

Which of the following substances is an Arrhenius acid?

A
BF3
B
HCN
C
NH3
D
Mg(OH)2

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