AnswersS1S Chemistry B E4912 - AGUnit Test

Unit Test — Unit test Answers

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H2CO3 is used in soft drinks. What is the name of this compound?

A
sulfuric acid
B
carbonic acid
C
tartaric acid
D
hydrochloric acid
22
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What is a base used in deodorants?

A
sorbitol
B
carrageenan
C
magnesium hydroxide
D
sodium lauryl sulfate
23

Which pair of substances would most likely result in the production of a solid when reacting with a base?

A
litmus and phenolphthalein
B
soluble metal salt and carbon dioxide
C
acids and water
D
hydrogen ions and soaps
24

What is the pH of a solution with [H+] = 1.25 10–10 M?Use .

Question illustration
A
–10.1
B
–9.90
C
7.90
D
9.90
25

Consider the reaction below.H2PO4– + H2O H3O+ + HPO42–Which of the following is a base–conjugate acid pair?

Question illustration
A
H2O and H3O+
B
H2O and H2PO4–
C
H2PO4– and HPO42–
D
H2PO4– and H3O+
26

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.
27

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
28

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+
29

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
30

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.
31

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.
32

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
33

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
34

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
35

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
36

Which of the following substances is an Arrhenius acid?

A
BF3
B
HCN
C
NH3
D
Mg(OH)2
37

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
38

A solution containing HCl would likely have

A
a high pH and a low pOH.
B
a low pH and a high pOH.
C
a high pH and a high pOH.
D
a low pH and a low pOH.
39

When does phenolphthalein turn pink?

A
in the presence of a base
B
in the presence of an acid
C
when it is in a neutral solution
D
when it is reacting with a metal
40

Which compound plays an important role in leather processing and electroplating?

A
nitric acid
B
hydrochloric acid
C
ammonia
D
magnesium hydroxide

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