New York Science Grade 7

Chapter 12: Chemical Reactions

Balancing Equations

1
Balance the equation P4 + O2 ? P4 O10 .
A)P4 + 5O2 ? P410
B)5P4 + O2 ? P410
C)P4 + 10O2 ? 4P410
D)2P4 + 5O2 ?4P410
2
Balance the equation Na + Fe2O3 ? Na2O + Fe.
A)6Na + Fe2O3 ? 3Na2O + 2Fe
B)Na + Fe2O3 ? Na2O + 2Fe
C)6Na + 2Fe2O3 ? 3Na2O + 2Fe
D)3Na + Fe2O3 ? 3Na2O + 2Fe
3
Balance the equation P4 + S8 ? P4S3.
A)8P4 + 3S8 ? 8P4S3
B)P4 + 3S8 ? 8P4S3
C)8P4 + S8 ? 8P4S3
D)3P4 + 4S8 ? 3P4S3
4
Balance the equation Fe + S? Fe2Spreadsheet Investigation3.
A)2Fe + 3S ? Fe2S3
B)3Fe + 2S ? Fe2S3
C)2Fe + 2S ? 3Fe2S3
D)4Fe + 3S ? 2Fe2S3
5
Balance the equation NaN3 ? Na + N2.
A)2NaN3 ? 2Na + 3N2
B)NaN3 ? Na + 3N2
C)3NaN3 ? 3Na + 3N2
D)NaN3 ? 2Na + 3N2
6
Balance the equation C3H8 + O2 ? CO2 + H2O.
A)C3H8 + 5O2 ? 3CO2 + 4H2O
B)2C3H8 + 5O2 ? 2CO2 + 4H2O
C)C3H8 + 4O2 ? 3CO2 + 4H2O
D)C3H8 + 5O2 ? CO2 + 4H2O
7
Balance the equation K + H2O ? KOH + H2.
A)2K + 2H2O ? 2KOH + H2.
B)2K + H2O ? 2KOH + H2
C)K + 2H2O ? 2KOH + H2
D)3K + 3H2O ? 3KOH + H2
8
Balance the equation HgO ? Hg + O2.
A)2HgO ? 2Hg + O2
B)2HgO ? Hg + 2O2
C)2HgO ? 2Hg + 2O2
D)2HgO ? Hg + O2
9
Balance the equation KClO3 ? KCl + O2.
A)2KClO3 ? 2KCl + 3O2
B)2KClO3 ? 2KCl + O2
C)KClO3 ? KCl + 3O2
D)KClO3 ? KCl + O2
10
Balance the equation CO + NO2 ? CO2 + NO.
A)2CO + 2NO2 ? CO2 + NO
B)3CO + NO2 ? 3CO2 + NO
C)CO + 2NO2 ? CO2 + 2NO
D)2CO + 2NO2 ? 3CO2 + 2NO
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