Worksheets3.1 ANALYSING REDOX REACTIONS
Total questions: 20
Worksheet time: 2hrs 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?
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
H
c)
S
S
S
d)
O
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.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
11.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
12.
In the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?
which element, if any, is oxidized?
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
13.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
14.
Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O2
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
15.
A redox reaction is NOT:
a)
all reactions
b)
a combustion reaction
c)
a reduction-oxidation reaction
d)
a reaction in which electrons are transferred from one atom to another
16.
Defined as the loss of electrons.
a)
oxidation
b)
reduction
c)
redox
d)
OIL RIG
17.
Defined as the gain of electrons.
a)
oxidation
b)
redox
c)
reduction
d)
LEO GER
18.
Cl2 + 2e- --> 2Cl - is an example of:
a)
a chemical reaction
b)
redox
c)
oxidation
d)
reduction
19.
Substance that oxidizes another substance by accepting its electrons.
a)
reducing agent
b)
oxidation number
c)
combustion
d)
oxidizing agent
20.
What is the reducing agent here: N2 + 3H2 --> 2NH3
a)
N2
b)
H2
c)
NH3
d)
2NH3
100 %
