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15 Regents: Oxidation/Reduction Reactions

Total questions: 55

Worksheet time: 3hrs 30mins

Name
Class
Date
1.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
2.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
3.

What are the coefficients when the equation is balanced for mass and charge?

a)
2 + 3 --> 2 + 3 + 4
b)
1 + 3 --> 1 + 3 + 2
c)
2 + 4 --> 2 + 3 + 2
d)
1 + 1 --> 1 + 1 + 1
4.
What element is being Oxidized?
a)
I
b)
H
c)
S
d)
O
5.
What element is being reduced?
a)
I
b)
H
H
c)
S
S
d)
O
O
6.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
7.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
8.
What is oxidation number of H in CaH2?
a)
+1
b)
-1
c)
0
d)
+2
9.
What is oxidation number of Fe in FeO ?
a)
+2
b)
-2
c)
0
d)
+1
10.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
11.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
12.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
13.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
14.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
15.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
16.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
17.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
18.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
19.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
20.

Al (s) + FeSO4 (aq) → Al2(SO4)3 (aq) + Fe (s)

Which statements are true about this reaction?

I. Al (s) reduces Fe2+ (aq)

II. Al (s) is the oxidizing agent.

III. FeSO4 is the oxidizing agent.

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

21.

Consider the following reaction.

NO3− (aq) + Cu (s) → NO (g) + Cu2+ (aq)

Which statement is correct?

a)

Cu (s) is the reducing agent because it loses electrons.

b)

Cu (s) is the reducing agent because it gains electrons.

c)

Cu (s) is the oxidizing agent because it loses electrons.

d)

Cu (s) is the oxidizing agent because it gains electrons.

22.

The following chemical equation represents the extraction of silicon from quartz using coke.

SiO2 + C → Si + CO2

What is the change in oxidation number of silicon?

a)

+2 to 0

b)

+4 to 0

c)

0 to +2

d)

0 to +4

23.

What is the oxidation number of X in XO4-?

a)

+4

b)

+5

c)

+7

d)

+8

24.

Which equation represents a redox reaction?

a)

NaOH + HNO3 → NaNO3 +H2O

b)

2AgNO3 + Zn → Zn(NO3)2 + 2Ag

c)

2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3

d)

CaCO3 + 2HCl → CaCl2 + H2O + CO2

25.

Substance that oxidizes another substance by accepting its electrons.

a)

reducing agent

b)

oxidation number

c)

disproportionation

d)

oxidizing agent

26.

What is the oxidation number of C in SrCO3?

a)

-4

b)

+2

c)

-6

d)

+4

27.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

28.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

29.
Is calcium oxidized or reduced in the following reaction? 
2 CaO--> 2 Ca + O2
a)
Oxidized
b)
Reduced
30.

A decrease in oxidation number.

a)

concentrated

b)

reduction

c)

oxidation

d)

dilute

31.

An increase in oxidation number.

a)

more acidic

b)

reduction

c)

less basic

d)

oxidation

32.

These keep track of the movement of electrons.

a)

(+) and (-) signs

b)

oxidation numbers

c)

coefficients

d)

subscripts

33.

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

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

34.

Defined as the gain of electrons.

a)

oxidation

b)

redox

c)

reduction

d)

LEO GER

35.

Defined as the loss of electrons.

a)

oxidation

b)

reduction

c)

redox

d)

OIL RIG

36.

Combustion and single-replacement reactions are __________ redox reactions.

a)

always

b)

never

c)

sometimes

d)

mostly

37.

_____________ synthesis and decomposition reactions involve the transfer of electrons.

a)

All

b)

Most

c)

No

d)

Some

38.

An increase in oxidation number.

a)

more acidic

b)

reduction

c)

less basic

d)

oxidation

39.

A decrease in oxidation number.

a)

concentrated

b)

reduction

c)

oxidation

d)

dilute

40.

What is a half-reaction of this equation, Na + Cl --> NaCl ?

a)

Cl + e- --> Cl-

b)

Cl - e- --> Cl-

c)

Na --> Na + e-

d)

Na° + Cl°--> Na+1Cl-1

41.

What is the reducing agent here: N2 + 3H2 --> 2NH3

a)

N2

b)

H2

c)

NH3

d)

2NH3

42.

What does the mnemonic phrase does LEO GER represent?

a)

Let Ewoks Operate and Get Essential Rats

b)

Loss of Electrons is Oxidation and Gain of Electrons is Reduction

c)

Loss of Energy is Onerous and Gain of Energy is Rad

d)

Less Electrons are Only Gain for Eventual Reacting

43.

What does the mnemonic phrase OIL RIG mean?

a)

Ox Is Losing Re Is Galloping

b)

Oxidation Is Lustrous, Reduction is Grating

c)

Oxidation Is Longer, Reduction is Great

d)

Oxidation Is Loss, Reduction Is Gain

44.

What do the mnemonic phrases OIL RIG and LEO GER help with?

a)

Knowing that Lions and Oil are directly connected to atoms and molecules

b)

Knowing that oil is an integral part of redox reactions

c)

Knowing that losing electrons is oxidation and gaining electrons is reduction

d)

Knowing that Oxidation is loss and reduction is gain of electrons

45.

Charge of the anode

a)

Positive

b)

Negative

46.

Charge of the cathode

a)

Positive

b)

Negative

47.

Flow of electrons

a)

From cathode to anode

b)

From anode to cathode

48.

Oxidation occurs at the

a)

anode

b)

cathode

49.

Reduction occurs at the

a)

anode

b)

cathode

50.
Metal A is more reactive than metal B. Which statement is correct?
a)
Electrons flow in the external circuit from A to B
b)
Positive ions flow through salt bridge from A to B
c)
Positive ions flow in external circuit from B to A.
d)
Electrons flow through salt bridge from B to A
51.

What type of electrochemical cell is shown?

a)

oxidation cell

b)

electrolytic cell

c)

reduction cell

d)

voltaic cell

52.

Write the balanced half-reaction for the reduction that occurs in this electrolytic cell.

a)

Cl2 + 2e⁻ → 2Cl⁻

b)

Cl2 → 2Cl⁻ + 2e⁻

c)

2Na⁺ + 2e⁻ → 2Na

d)

2Na⁺ → 2Na + 2e⁻

53.

Which type of cell does the diagram represent?

a)

electrolytic, with the anode at A

b)

electrolytic, with the cathode at A

c)

voltaic, with the anode at A

d)

voltaic, with the cathode at A

54.
What reaction occurs at the anode?
a)
Ag+ + e- →Ag
b)
Ag → Ag+ + e-
c)
Ni2+ + 2e- → Ni
d)
Ni → Ni2+ + 2e-
55.

The part of the electrolytic cell at which electrons are produced is the _____.

a)

anode

b)

cathode

c)

external circuit

d)

salt bridge

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