AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations — Unit test Answers

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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
2
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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
3

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.
4

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.
5

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
6

Which of the following substances is an Arrhenius acid?

A
BF3
B
HCN
C
NH3
D
Mg(OH)2
7

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
8

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
9

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
10

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
11

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+
12

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.
13

Which would most likely be the pH of a highly-corrosive acid?

A
1
B
5
C
8
D
11
14

The reaction below demonstrates which characteristic of a base?

Question illustration
A
the ability of bases to release sodium ions into solution
B
the ability of bases to release hydrogen ions into solution
C
the ability of a base to react with carbonate or bicarbonate
D
the ability of a base to react with a soluble metal salt
15

Which is a characteristic of a strong base?

A
It turns pink phenolphthalein colorless.
B
It turns blue litmus paper red.
C
It releases H+ ions into a solution.
D
It removes H+ ions from solution.
16

What is the Arrhenius definition of an acid?

A
A substance that increases H3O+ concentration when it is dissolved in water.
B
A substance that increases OH– concentration when it is dissolved in water.
C
A compound that donates protons.
D
A compound that accepts protons.
17

What is the Bronsted-Lowry definition of a base?

A
a compound that donates protons
B
a compound that accepts protons
C
a substance that increases hydroxide ion concentration
D
a substance that increases hydronium ion concentration
18

Look at the reaction below.Which substance is the base in the reaction?

Question illustration
A
2H2O (l)
B
H2SO4 (aq)
C
CaSO4 (aq)
D
Ca(OH)2 (aq)
19

Which statement describes the Arrhenius interpretation of acids and bases?

A
It has a wider range of applications than the Bronsted-Lowry interpretation.
B
It has a wider range of applications than the Lewis and Bronsted-Lowry interpretations.
C
It is used in situations that involve bases that do not produce hydroxide ions.
D
It is limited to situations that involve aqueous solutions or specific compounds.
20

Consider the reaction below.HClO3 + NH3 NH4+ + ClO3–Which is a base-conjugate acid pair?

Question illustration
A
NH3 and ClO3–
B
NH3 and NH4+
C
HClO3 and NH3
D
HClO3 and NH4+

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