Redox And Balancing Chemical Equation Worksheet With Answers - Red River College Page 2
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2Chemistry Worksheet
Redox & Balancing Chemical Equation (1)
(a) Chromium is reduced. Iodine is oxidized,
(b) Chromium is the oxidizing agent. Iodine is the reducing agent.
(c) To balancing the reaction equation:
We start balancing the charge for Chromium and Iodine using the result of (a) and (b):
Cr
O
).
Because Chromium gains 3 electrons/atom, so total gain 6 electrons for
2
Chromium (K
2
2
7
Iodine loses 1 electron/atom, so it needs
6
iodine this is follow the conservation rule of charge
during the chemical reaction process as the result we multiply
6
for reactant KI in equation. In order
K
SO
by
4,
multiply
to balance all the reactants and products in mass we multiply I
by 3, multiply
2
2
4
H
S0
by 7, and multiply H
O by 7.
2
4
2
Here is the balanced equation:
( SO
)
K
Cr
O
+ 6KI + ��H
S0
→ Cr
+ ��K
SO
+ 3I
+ 7H
O
2
2
7
2
4
2
4
3
2
4
2
2
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