AnswersPF 2425 NW3 Chemistry CRReactions in Aqueous Solutions

Reactions in Aqueous Solutions Answers

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1
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Which substance will most likely ionize when it is dissolved in water?

A
HBr
B
CaBr2
C
MgCl2
D
KCl
2
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Which is an example of dissociation?

A
C + O2 CO2
Option A
B
NH3 + H2O NH4+ + OH–
Option B
C
SO2 + H2O HSO3– + H+
Option C
D
Ca3(PO4)2 3Ca2+ + 2PO43–
Option D
3

Which reaction would produce a solution that conducts electricity extremely well?

A
H3PO3(aq) H+(aq) + H2PO3–(aq)
Option A
B
CH3CH2COOH(aq) + H2O(l) H3O+(aq) + CH3CH2COO–(aq)
Option B
C
CH3CH2OH(l) CH3CH2OH(aq)
Option C
D
Ca(NO3)2(s) Ca2+(aq) + 2NO3–(aq)
Option D
4

Which is a characteristic of a nonelectrolyte?

A
It does not dissociate or ionize in water.
B
It partially dissociates or ionizes in water.
C
It conducts electricity poorly.
D
It conducts electricity extremely well.
5

Nonelectrolytes fail to ionize or dissociate in water because

A
they are very weakly bonded to each other.
B
they are very strongly bonded to each other.
C
the water molecules keep them together by hydration.
D
they are forced together by the repulsion of water molecules.
6

Consider the reaction below.Zn(s) + 2HCl(aq) H2(g) + ZnCl2(aq)Which product is a substance that is dissolved in solution?

Question illustration
A
Zn
B
H2
C
HCl
D
ZnCl2
7

Shown below is an ion from a salt molecule.Which statement best explains the event?

Question illustration
A
This is hydration, which occurs during ionization.
B
This is hydration, which occurs during dissociation.
C
This is the formation of electrolytes during ionization.
D
This is the formation of ions from a covalent compound.
8

Which formula represents a double displacement reaction?

A
Ca(OH)2(s) CaO(s) + H2O(g)
Option A
B
C2H5OH(I) + O2(g) CO2(g) + H2O(g)
Option B
C
Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g)
Option C
D
Pb(NO3)2(aq) + 2HCl(aq) 2HNO3(aq) + PbCl2(s)
Option D
9

Which is a characteristic of a weak electrolyte?

A
It does not dissociate or ionize in water.
B
It partially dissociates or ionizes in water.
C
It does not conduct electricity.
D
It easily conducts electricity.
10

Which chemical reaction involves the production of a gas?

A
2Li(s) + F2(g) 2LiF(s)
Option A
B
Zn(s) + 2HCl(aq) H2(g) + ZnCl2(aq)
Option B
C
HNO3(l) + H2O(l) H3O+(aq) + NO3–(aq)
Option C
D
K2CrO4(aq) + Ba(NO3)2(aq) BaCrO4(s) + 2KNO3(aq)
Option D
11

An aqueous solution is made from a molecular compound rather than from an ionic compound. If some ions are present in solution, which best describes the solute?

A
a weak electrolyte
B
a nonelectrolyte
C
a strong electrolyte
D
a covalent electrolyte
12

Which describes a precipitate in a chemical reaction?

A
a gaseous reactant that forms aqueous products
B
a solid reactant that forms aqueous products
C
a gaseous product formed from aqueous reactants
D
a solid product formed from aqueous reactants
13

Consider the equation below.AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq)Which compound is the precipitate in this chemical reaction?

Question illustration
A
AgNO3
B
NaCl
C
AgCl
D
NaNO3
14

For an experiment, a student needs a compound that has the following properties.• It dissolves in water.• It is an electrolyte.• It is excellent conductor of electricity.Which substance would be the best choice for the experiment?

A
methanol
B
acetic acid
C
distilled water
D
potassium chloride
15

Which substance is a strong electrolyte?

A
NH3
B
Ba(OH)2
C
C12H22O11
D
CH3COOH

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