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Q4 Extra Credit

Total questions: 105

Worksheet time: 2hrs 3mins

Name
Class
Date
1.

What is the oxidation state of H in H2?

a)

+2

b)

+1

c)

0

d)

None of the above

2.
What is the oxidation of C in CH4?
a)

-4

b)

-1

c)

+4

d)

+1

3.
What is the oxidation number of O in CO2?
a)

+2

b)

-1

c)

+4

d)

-2

4.

The sum of the oxidation numbers in SCN- is equivalent to

a)

0

b)

-1

c)

+1

d)

+3

5.

The sum of the oxidation numbers in Na2CO3 is equivalent to

a)

0

b)

-2

c)

+1

d)

-1

6.

What is the oxidation number of iodine in KIO3?

a)

0

b)

-1

c)

+5

d)

+1

7.
What is the oxidation number of N in NO21- ?
a)

-3

b)

+4

c)

-2

d)

+3

8.
What is oxidation number of Mn in MnO2 ?
a)

0

b)

+2

c)

-2

d)

+4

9.
What is the oxidation number of S in SO4 2-  ?
a)
-2
b)
+2
c)
+6
d)
-4
10.
What is oxidation number of Cr in
Cr2O72-?
a)

-2

b)

+2

c)

+6

d)

+12

11.

Oxidation number of O in the compound H2O2:

a)

0

b)

-1

c)

-2

d)

+2

12.

Give the oxidation number for the underlined atoms below.

a)

+4

b)

-4

c)

+2

d)

-2

13.

Give the oxidation number for the underlined atoms below.

a)

-2

b)

+2

c)

+1

d)

-1

14.

Determine the oxidation number of the red underlined element.

NaCl

a)

+1

b)

-1

c)

-2

d)

0

15.

Determine the oxidation number of the red underlined element.

NH4+

a)

+3

b)

-1

c)

-3

d)

0

16.

Determine the oxidation number of the red underlined element.

AlPO4

a)

+5

b)

-3

c)

-5

d)

-1

17.

oxidation number Cu2+ is ...

a)

-1

b)

0

c)

+1

d)

+2

18.

oxidation number Na+ is ...

a)

0

b)

+1

c)

+2

d)

+3

19.

oxidation number Mg is ...

a)

0

b)

+1

c)

+2

d)

+3

20.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
21.

What is the oxidation state of H in H2?

a)

0

b)

+1

c)

-1

d)

-2

22.

What is the oxidation number of Na+

a)

+1

b)

-1

c)

+2

d)

0

23.

Identify which reactant is oxidized and which is reduced in the following reaction.

2Al(s) + 3Cu2+(aq) →2Al3+(aq) + 3Cu(s)

a)

Al is oxidized and Cu2+ is reduced.

b)

Cu2+ is oxidized and Al is reduced.

c)

Both Al and Cu2+ are oxidized.

d)

Both Al and Cu2+ are reduced.

24.

Identify which reactant is oxidized and which is reduced in the following reaction.

2Cr3+(aq) + 3Zn(s) →2Cr(s) + Zn2+(aq)

a)

Cr3+ is oxidized and Zn is reduced.

b)

Cr3+ is reduced and Zn is oxidized.

c)

Both Cr3+ and Zn are oxidized.

d)

Both Cr3+ and Zn are reduced.

25.

Identify which reactant is oxidized and which is reduced in the following reaction.

2Au3+(aq) + 3Cd(s) →2Au(s) + 3Cd2+(aq)

a)

Au3+ is oxidized and Cd is reduced.

b)

Au3+ is reduced and Cd is oxidized

c)

Both Au3+ and Cd are reduced.

d)

Both Au3+ and Cd are oxidzed.

26.

Which change indicates oxidation?

a)

Cu becomes Cu2+

b)

Sn4+ becomes Sn2+

c)

Fe2+ becomes Fe

d)
27.

Which change indicates oxidation?

a)

Sn4+ becomes Sn2+

b)

Cr3+ becomes Cr6+

c)

Fe3+ becomes Fe

28.

Which change indicates reduction?

a)

Cu becomes Cu2+

b)

Sn4+ becomes Sn2+

c)

Ag becomes Ag+

29.

Which change indicates reduction?

a)

Fe becomes Fe2+

b)

Fe2+ becomes Fe

c)

Ag becomes Ag+

30.

Identify the following reaction as an oxidation reaction or a reduction reaction.

Fe2+ → Fe3+ + e-

a)

Oxidation Reaction

b)

Reduction Reaction

c)

Neither a Reduction or an Oxidation Reaction

31.

Identify the following reaction as an oxidation reaction or a reduction reaction.

Fe3+ + e- → Fe2+

a)

Oxidation Reaction

b)

Reduction Reaction

c)

Neither an Oxidation Reaction or a Reduction Reaction

32.

Cl2 + 2e- --> 2Cl - is an example of:

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

33.
Which statement is true:
Mg → Mg2+ + 2e–
a)

Mg gains 2 electrons

b)

Mg2+ loses 2 electrons

c)

Mg loses 1 electron

d)

Mg loses 2 electrons

34.

In a reaction, copper is reduced; its number of electrons has:

a)

Increased

b)

Decreased

c)

Remained Constant

d)

Varies Randomly

35.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

36.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

37.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)

Iron

b)

Fluorine

c)

Oxygen

38.
Which of the following half reactions correctly represents a reduction half reaction?
a)

Fe →Fe2+ + 2e-

b)

Pb4+ + 2e- →Pb2+

c)

2O-2 →O2 + 4e-

d)

Fe + 3e- →Fe3+

39.
Which statement is true:
Mg → Mg2+ + 2e–
a)

Mg gains 2 electrons

b)

Mg2+ loses 2 electrons

c)

Mg loses 1 electron

d)

Mg loses 2 electrons

40.
What element is being Reduced?
a)

N

b)

H

c)

O

d)

S

41.
What element is being Oxidized?
a)

N

b)

H

c)

O

d)

S

42.

In a reaction, copper is reduced; its number of electrons has:

a)

Increased

b)

Decreased

c)

Remained Constant

d)

Varies Randomly

43.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)

Reduced

b)

Synthesized

c)

Oxidized

d)

None of the above

44.

What is the oxidation state of Cr in CrO42- ?

a)

+6

b)

+2

c)

-2

d)

+8

45.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)

Zinc

b)

Hydrogen

c)

Oxygen

d)

None

46.
Which of the following half reactions correctly represents a reduction half reaction?
a)

Fe →Fe2+ + 2e-

b)

Pb4+ + 2e- →Pb2+

c)

2O-2 →O2 + 4e-

d)

Fe + 3e- →Fe3+

47.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)

Iron

b)

Fluorine

c)

Oxygen

48.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)

Zinc

b)

Hydrogen

c)

Oxygen

d)

None

49.

Given the cell reaction:


Ca(s) + Mg2+(aq) → Ca2+(aq) + Mg(s)


Which substance was oxidized?

a)

Ca(s)

b)

Mg2+(aq)

c)

Ca2+(aq)

d)

Mg(s)

50.

Which half-reaction correctly represents oxidation?

a)

Sn2+ + 2e– → Sn0

b)

Sn4+ + 2e– → Sn2+

c)

Sn2+ → Sn0 + 2e–

d)

Sn2+ → Sn4+ + 2e–

51.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)

Iron

b)

Fluorine

c)

Oxygen

52.

Acids have a ______ pH and a _________ pOH

a)

low, high

b)

high, low

c)

An acid will not have a pOH

53.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
54.
If the pH of a solution is 7 the solution is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
Tasty
55.

Which of these solutions is an acid?

a)

Dish Soap: pH of 12

b)

Tomato Soup: pH of 4

c)

Baking Soda: pH of 9

d)

Drain Cleaner: pH of 14

56.

Ammonia has a pOH of 2. Ammonia is __________.

a)

an acid

b)

a base

c)

an element

d)

a metal

57.

An acid

a)

is a substance that releases H+ ions when dissolved in water

b)

is a substance that does not release any ions when dissolved in water

c)

is a substance that releases OH- when dissolved in water

d)

releases an equal amount of OH- and H+ ions when dissolved in water

58.

The picture below shows the relative concentrations of H+ and OH- in a solution. Is the solution an acid or a base?

a)

acid

b)

base

59.
When dissolved in water, bases produce:
a)
acids
b)
salts
c)
hydrogen ions
d)
hydroxide ions
60.
A  pH and a pOH will add up to:
a)
0
b)
7
c)
14
d)
1.0 x 10-14
61.

Water has a neutral because

a)

it has more H+ ions than OH-

b)

it has more OH- ions than H+

c)

it does not produce any ions

d)

it has an equal amount of H+ and OH- in solution

62.
A solution has a pH of 7.0.  What would happen to the pH if H ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
63.

A solution has a pH of 7.0. What would happen to the pH if OH- ions were added?

a)

pH would go up

b)

pH would go down

c)

pH would stay the same

d)

None of these

64.

If the [H+] of a solution is 1 x 10-2 M the pH is

a)

2

b)

12

c)

-2

d)

1

65.
If the pH of a solution is 5 the [H+] is
a)
1.0 x 105  M
b)
1.0 x 109  M
c)
5.0 x 101  M
d)
1.0 x 10-5  M
66.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
67.

If the [H3O+] of a solution is 1 x 10-8 M the [OH-] is

a)

1.0 x 10-6 M

b)

1.0 x 106 M

c)

1.0 x 10-8 M

d)

1.0 x 108 M

68.
Limes have a [H3O+] of 1.3 x 10-2 mol/L.  Their pOH is
a)
1.89
b)
12.11
c)
1.03
d)
12.97
69.
if a solution has a pOH of 5.2 the [OH-] of the solution is
a)
6 x 10 -6 M
b)
6.3 x 10 -6 M
c)
1.58 x 10-5 M
d)
2 x 10-5 M
70.
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution will be
a)
2.08
b)
11.92
c)
1.02
d)
12.98
71.
A solution with a [H+] of 9.4 x 10-5 mol/L is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
negative number, no solution.
72.
If the [OH-] of a solution is 2.7 x 10-4 mol/L the pOH of the solution is
a)
10.44
b)
3.56
c)
1.00
d)
-4.43
73.

Find the pH of a 0.000841 M solution of sodium hydroxide

a)

3.07

b)

9.88

c)

10.92

d)

11.23

74.

What is the pOH of a 0.0124 M HCl solution?

a)

1.91

b)

12.09

c)

1.61

d)

12.39

75.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
76.
What is the conjugate base in the following reaction?
a)
HCO3- 
b)
HCl
c)
 H2CO3 
d)

Cl-

77.

How do Bronsted-Lowry conjugate acid-base pairs differ?

a)

differ by one H+

b)

Differ by one OH-

c)

Differ by two H+

d)

Differ by some number of H+

78.

Which of the following correctly identifies an acid-base pair?

a)

HCl, NaOH

b)

H2CO3 , CO32-

c)

H3O+ , OH-

d)

NH4+, NH3

79.

Which of the following correctly identifies an Acid-Base Pair?

a)

HH4+ , OH-

b)

H2O , OH-

c)

CaCO3 ,CaCl2

d)

HNO3 , H2SO4

80.

What is NH4+ classified as?

a)

Acid

b)

Base

c)

Conjugate Acid

d)

Conjugate Base

81.

Which of the following word pairs correctly completes the sentence below? _______ are corrosive substances characterized as having a strong smell, a sour taste, and are able to give up a H+ ion.

a)

Acids

b)

Amphoteric Compound

c)

Bases

d)

Electrolyte

82.
A compound that donates H+ ions is 
a)
A Bronsted-Lowry Acid
b)
An Arrhenius Acid
c)
A Bronsted-Lowry Base
d)
An Arrhenius Base
83.

An Arrhenius base:

a)

donates H+

b)

accepts H+

c)

produces H+

d)

produces OH-

84.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
85.

Which of the following show an acid and its conjugate base pair (in that order)

a)

H2SO4, SO42-

b)

OH-, H2O

c)

NH4+, H2O

d)

H2CO3, HCO3-

86.

Given the reaction above, which compound is the acid?

a)

NH3

b)

HCl

c)

NH4+

d)

Cl-

87.

Given the reaction above, which compound is the conjugate base?

a)

NH3

b)

NH4+

c)

Cl-

88.

What is NH4+ classified as?

a)

Acid

b)

Base

c)

Conjugate Acid

d)

Conjugate Base

89.

The conjugate acid of HCO3- is ___ and the conjugate base of HCO3- is ___.

a)
H2CO3; CO3-2
b)
CO3-2; CO3-2
c)
H2CO3; H2O
d)
H2O; H2CO3
90.

Label the acid, base, conjugate acid and conjugate base.

a)

acid

b)

base

c)

conjugate acid

d)

conjugate base

1
2
3
4
1)
2)
3)
4)
91.

Click on the acid.

A
B
C
D
92.

Click on the base.

A
B
C
D
93.

Click on the conjugate base.

A
B
C
D
94.

Click on the conjugate acid.

A
B
C
D
95.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
96.
What is the conjugate base in the following reaction?
a)
HCO3- 
b)
HCl
c)
 H2CO3 
d)
Cl-
97.

What is NH4+ classified as?

a)

Acid

b)

Base

c)

Conjugate Acid

d)

Conjugate Base

98.

In the equation below, what is the conjugate base?

HBr + H2O ↔ Br- + H3O+

a)

HBr

b)

H2O

c)

Br-

d)

H3O+

99.

What is the conjugate base of HCl in the following reaction?

a)

HCO3-

b)

HCl

c)

H2CO3

d)

Cl-

100.

Match the following

  • Mg(OH)2(s)+ 2HCl(aq)→MgCl2(aq)+2H2O(l).

a)

Mg(OH)2

1.

base

b)

HCl

2.

acid

c)

MgCl2

3.

conjugate base

d)

H2O

4.

conjugate acid

101.

Match the following

  • CH3CO2H(aq) + H2O(l) ⇌ CH3CO2−(aq) + H3O+(aq)

a)

CH3CO2H

1.

acid

b)

H2O

2.

base

c)

CH3CO2−

3.

conjugate base

d)

H3O+

4.

conjugate acid

102.

Match the following

    • Ba(OH)2(aq) + 2HNO3(aq)→Ba(NO3)2(aq) + 2H2O(l)n

a)

HNO3

1.

acid

b)

Ba(OH)2

2.

base

c)

Ba(NO3)2

3.

conjugate base

d)

2H2O

4.

conjugate acid

103.

Match the following

    • HOCl(aq)+H2O(l)⇌OCl−(aq)+H3O+(aq)n

a)

HOCl

1.

acid

b)

H2O

2.

base

c)

OCl−

3.

conjugate base

d)

H3O+

4.

conjugate acid

104.

Match the following

    • CH3CO2H(aq)+H2O(l) ⇋ CH3CO2−(aq) + H3O+(aq)

a)

CH3CO2H

1.

acid

b)

H2O

2.

base

c)

CH3CO2−

3.

conjugate base

d)

H3O+

4.

conjugate acid

105.

Match the following

    • CH3CO2H(aq)+H2O(l) ⇋ CH3CO2−(aq) + H3O+(aq)

a)

CH3CO2H

1.

acid

b)

H2O

2.

base

c)

CH3CO2−

3.

conjugate base

d)

H3O+

4.

conjugate acid

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