Chemistry 30

Print out the practice set	Word	RTF	PDF
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1. Determine the oxidation number of each element in the following compounds.

	Hint	Oxidation Numbers for each Element
SnCl4	Rule 2	Sn	+4	Cl	-1
Ca3P2	Rule 2	Ca	+2	P	-3
SnO	Rules 4, 5	Sn	+2	O	-2
Ag2S	Rule 2	Ag	+1	S	-2
HI	Rule 3, 5	H	+1	I	-1
N2H4	Rule 3, 5	N	-2	H	+1	watch the sign for N!
Al2O3	Rule 4, 5	Al	+3	O	-2
S8	Rule 1	S	0			pure element
HNO2	Rules 3, 4, 5	H	+1	N	+3	O	-2
O2	Rule 1	O	0			pure element
H3O+	Rules 3, 4, 6	H	+1	O	-2
ClO3-	Rules 4, 6	Cl	+5	O	-2	note ion's charge!
S2O22-	Rules 4, 6	S	+2	O	-2
KMnO4	Rules 4, 5, 6	K	+1	Mn	+7	O	-2
(NH4)2SO4 Rules 4, 5, 6		N	-3	H	+1	S	+6	O	-2

The print versions of the answer key provides additional help for solving KMnO₄  and (NH₄)₂SO₄

2. Determine the oxidation number of carbon in each of the following compounds:

a.	methane, CH2	-4
b.	formaldehyde, CH2O	0
c.	carbon monoxide, CO	+2
d.	carbon dioxide, CO2	+4

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