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Worksheetschemistry test renjini
Total questions: 10
Worksheet time: 41mins
Name
Class
Date
1.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
2.
Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O2
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
3.
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
4.
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
5.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
6.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
7.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
8.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
9.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
10.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
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