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SDSMT - Exam 3 - Redox Chemistry

Total questions: 34

Worksheet time: 19mins

Name
Class
Date
1.

What is the oxidizing agent in the combustion of methanol (CH3OH)?

a)

CO₂

b)

O₂

c)

CH3OH

d)

H₂O

e)

No oxidizing agent

2.

What precipitate forms when mixing copper(II) sulfate and sodium nitrate?

a)

no precipitate forms

b)

sodium sulfate

c)

copper(III) nitrate

d)

copper(I) nitrate

e)

copper (II) nitrate

3.

When Mg(OH)2 reacts with H2SO4 what are the products?

a)

MgO and H2SO4

b)

MgSO4 and H2O

c)

MgSO4 and SO2

d)

Mg(OH)2 and H2SO4

e)

No reaction

4.

In the following reaction, which element in what species is reduced?

Zn (s) + 2 HCl (aq) → ZnCl2 (aq) + H2 (g)

a)

H in HCl

b)

Zn2+ in ZnCl2

c)

Cl in HCl

d)

Zn

e)

This is not a redox reaction.

5.

What is the oxidation number of Cr in a dichromate anion, Cr2O7²-?

a)

+5

b)

+4

c)

+2

d)

+6

e)

No oxidizing agent

6.

Which one of the following is the correct dissociation equation for Na2SO4?

a)

Na2SO4(s) → 2Na+ (aq) + S6+(aq) +4O2-(aq)

b)

Na2SO4(s) → Na+ (aq) + SO4²-(aq)

c)

Na2SO4(s) → 2Na+ (aq) + SO4²-(aq)

d)

2Na+ (aq) + SO4²-(aq) → Na2SO4(s)

e)

No Reaction

7.

Which one of the following statements is correct about the reaction below?

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

a)

H+ is the reducing agent because it loses electrons.

b)

Mg is oxidizing agent because it loses electrons.

c)

The reaction is not a redox reaction.

d)

Cl- is the reducing agent because is it an ion.

e)

H+ is the oxidizing agent because it gains electrons.

8.

The ions formed when C6H12O6 (glucose) dissociates in water are

a)

No ions form, as C6H12O6 does not dissociate

b)

C6H11O6 and H+

c)

C6H122+and O²-

d)

C4-, H+, and O2-

e)

C6H12O5+ and OH-

9.

Which one of the following is a neutralization reaction?

a)

CaCO3 (s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

b)

HClO4(aq) + NaOH(aq) → NaClO4(aq) + H2O(l)

c)

Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

d)

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

e)

2NaOH(aq) +MgCl2(aq)

→

2NaCl(aq) +Mg(OH)2(s)

10.

After balancing of the equation for the following reaction in basic solution,

MnO4 (aq) + PO33-(aq) → MnO2(s) + PO43-(aq)

what is the sum of ALL the coefficients in the equation?

a)

10

b)

7

c)

4

d)

16

e)

13

11.

What precipitate forms when mixing lead(II) nitrate and sodium iodide?

a)

no precipitate forms

b)

lead(II) iodide

c)

sodium nitrate

d)

lead(II) nitrate

e)

sodium iodide

12.

The chemical reaction CaCO3 → CaO + CO2 is classified as a

a)

synthesis reaction

b)

redox reaction

c)

decomposition reaction

d)

precipitation reaction

e)

combustion reaction

13.

Complete and balance the following half-reaction in acidic solution, As (s) --> AsH3 (s).

How many electrons are needed to balance the half reaction?

a)

no electrons on both sides

b)

1 electron, left side

c)

1 electron, right side

d)

3 electrons, left side

e)

3 electrons, right side

14.

The balanced equation for oxidation of iron metal to form rust (Fe2O3) is the following,

4Fe (s) + 3 O2 (g) --> 2Fe2O3(s)

How many electrons are transferred during the oxidation of iron metal to form rust (Fe2O3) per the

balanced equation above?

a)

0 electrons

b)

12 electrons

c)

3 electrons

d)

6 electrons

e)

4 electrons

15.

Considering the redox reaction

Sn4+ + Mn →\rightarrow Mn2+ + Sn,

how many electrons are transferred in the

balanced reaction?

a)

0

b)

3

c)

4

d)

2

e)

1

16.

What is the correct name for the precipitate formed when mixing potassium carbonate and nickel(II)

chloride?

a)

nickel(II) carbonate

b)

potassium chloride

c)

nickel(II) chloride

d)

potassium nickel(II) carbonate

e)

nickel(III) carbonate

17.

In which one of the following molecules does sulfur have the smallest oxidation number?

a)

SO2

b)

SO3

c)

S2O82-

d)

S2O32-

e)

SO42-

18.

Which one of the following can be classified as a nonelectrolyte?

a)

NaI

b)

LiClO3

c)

HCl

d)

K2CO3

e)

Cl2

19.

Which one of the following can be classified as a weak electrolyte?

a)

HNO3

b)

CaF2

c)

OF2

d)

HBr

e)

CH3COOH

20.

Classify the following type of reaction: NaCl(aq) + AgNO3(aq) --> AgCl(s) + NaNO3(aq).

a)

combination reaction

b)

redox reaction

c)

precipitation reaction

d)

acid/base reaction

e)

decomposition reaction

21.

The oxidation number on the carbon in CH3OH is

a)

+1

b)

+2

c)

-4

d)

-2

e)

0

22.

Which of the following is a redox reaction?

a)

CaCO3 (s) + 2HCl(aq)

-->

CaCl2(aq) + CO2(g) + H2O(l)

b)

ZnSO4(aq) +

Hg2(NO3)2(aq)

-->

Hg2SO4(s) + Zn(NO3)2(aq)

c)

HNO3(aq) + KOH(aq)

-->

KNO3(aq) + H2O(l)

d)

2NaOH(aq)+ MgCl2(aq) -->

2NaCl(aq) + Mg(OH)2(s)

e)

Zn(s) + 2HCl(aq)

-->

ZnCl2(aq) + H2(g)

23.

Which one of the following represents the net ionic equation for the reaction of AgNO3 and KBr?

a)

Ag+(aq) + Br-(aq)

-->

AgBr(s)

b)

Ag+(aq) + NO3-(aq)

-->

AgNO3(s)

c)

K+(aq) + NO3-(aq)

-->

KNO3(s)

d)

KBr(aq)

-->

K+ (aq) + Br- (aq)

e)

AgBr (s)

-->

Ag+(aq) + Br-(aq)

24.

When CaCl2 dissolves in water ____

a)

the Ca2+ ion will chemically bind to the water molecule.

b)

CaCl2 will stay together as molecules surrounded by water.

c)

the Ca2+ ion will be attracted to the oxygen atom in water.

d)

the Cl- ion will be attracted to the oxygen atom in water.

e)

the Cl22- ion will be attracted to the oxygen atom in water.

25.

In the balance the half-reaction, SO32- (aq) --> SO42- (aq), taking place in basic media,

a)

there are 2OH-(aq) on the left side

b)

there are 2H+(aq) on the left side

c)

there are 2OH-(aq) on the right side

d)

there are 2e- on the left side

e)

there are 2H+(aq) on the right side

26.

Hydrogen gas can react with chlorine to produce hydrogen chloride.

Write the correct balanced reaction and identify the oxidizing agent.

a)

H2(g) + Cl2(g) --> 2HCl(g)

and H2 is the oxidizing agent

b)

H(g) + Cl(g) --> HCl(g)

and Cl is the oxidizing agent

c)

H(g) + Cl(g) --> HCl(g)

and HCl is the oxidizing agent

d)

H2(g) + Cl2(g) --> 2HCl(g)

and Cl2 is the oxidizing agent

e)

H2(g) + Cl2(g) --> 2HCl(g)

and HCl is the oxidizing agent

27.

The molecular equation of reaction between HCl solution and NaOH solution is the following:

HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O (l)

Which species is (are) the spectator ion(s)?

a)

There is no spectator ion.

b)

Cl- only

c)

Na+ only

d)

Na+ and Cl-

e)

H+ and OH-

28.

Based on the activity series of metals, which reaction below does not occur spontaneously upon mixing

the reagents shown?

a)

2Cr(s) + 3Cd2+(aq) --> 2Cr3+(aq) + 3Cd(s)

b)

Zn(s) + Cd2+(aq) --> Zn2+(aq) + Cd(s)

c)

Cd(s) + 2H+(aq) -->

Cd2+(aq) + H2(g)

d)

2Cr(s) + 6H+(aq) --> 2Cr3+(aq) + 3H2(g)

e)

2Cr(s) + 3Zn2+(aq) --> 2Cr3+(aq) + 3Zn(s)

29.

Based on the activity series of metals, which metal can be used to protect steel (Fe) from

corrosion?

a)

Au

b)

Cu

c)

Co

d)

Cr

e)

Ni

30.

In the reaction between FeCl3 and NaOH, the spectator ions are

a)

There is no spectator ion.

b)

Na+ and OH-

c)

Na+ and Cl-

d)

Fe3+ and Cl-

e)

Fe3+ and OH-

31.

In the following chemical reaction, which element is the reducing agent?

2 IO3-(aq) + 12 H+(aq) + 10 Ag(s) + 10 Cl-(aq) --> 10 AgCl(s) + I2(s) + 6H2O(l)

a)

H

b)

O

c)

Cl

d)

Ag

e)

I

32.

Which of the following reactions are written correctly?

a)

2 HCl (aq) + K2OH(aq) -->2 KCl(aq) + H2O(l)

b)

2HSO4(aq)+2NaOH(aq)

-->

2NaSO4(aq) + 2H2O(l)

c)

2HCl(aq) + MgOH(aq)

-->

MgCl2(aq) + H2O(l)

d)

H2SO4(aq)+2NaOH(aq)

-->

Na2SO4(aq) + 2H2O(l)

e)

2HNO3(aq) + KOH(aq)

-->

2KNO3(aq) + H2O(l)

33.

A strong electrolyte will

a)

completely dissociate in solution.

b)

will only partially dissociate in aqueous

solution.

c)

will transfer electrons to water.

d)

will not dissociate in solution.

e)

will be insoluble in solution.

34.

The reaction CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g) is an example of _____?

a)

a single placement reaction

b)

a decomposition reaction

c)

a precipitation reaction

d)

a combustion reaction

e)

an acid-base reaction

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