Redox And Balancing Chemical Equation Worksheet With Answers - Red River College

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Chemistry Worksheet
Redox & Balancing Chemical Equation (1)
From the following reaction:
( SO
)
K
Cr
O
+ KI + H
S0
→ Cr
+ K
SO
+ I
+ H
O
2
2
7
2
4
2
4
3
2
4
2
2
Find: (a) The oxidized and reduced chemical,
(b) The oxidizing and reducing agent,
(c) Balance equation
Notes:
Oxidation is the loss of electrons.
An element is called oxidized if it loses electron(s) during chemical reaction.
Reduction is the gain of electrons.
An element is called reduced if it gains electron(s) during chemical reaction.
Check each element to see if their charge was changed after chemical reaction.
Solution:
Potassium K ion is an alkali metal with always +1 charge.
No
change.
Oxygen O is nonmetal with always -2 charge in compound.
No
change.
Hydrogen H is nonmetal with always +1 charge in compound.
No
change.
S0
is a polyatomic ion with always -2 charge.
No change.
4
Chromium Cr is a transition metal with multiple positive charge: in K
Cr
O
(the reactant)
2
2
7
Cr is +6 charge but in Cr
( SO
)
(the product) Cr is +3 charge, so that means
Cr: from +6
2
4
3
to +3, so gains 3 electrons.
Iodine I is a nonmetal with always -1 charge in compound but after chemical reaction iodine
becomes single element iodine with zero charge, so
it loses one
charge.
Academic Success Centre
Created by Ming Xu
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