Glencoe Physical Science with Earth Science

Chapter 23: Chemical Reactions

Math Practice

1
Balance the equation P4 + O2 → P4O10.
A)5P4 + O2 → P410
B)P4 + 5O2 → P4O10
C)P4 + 10O2 → 4P410
D)2P4 + 5O2 → 4P410
2
Balance the equation Na + Fe2O3 → Na2O + Fe.
A)Na + Fe2O3 → Na2O + 2Fe
B)6Na + 2Fe2O3 → 3Na2O + 2Fe
C)6Na + Fe2O3 → 3Na2O + 2Fe
D)3Na + Fe2O3 → 3Na2O + 2Fe
3
Balance the equation P4 + S8 → P4S3.
A)P4 + 3S8 → 8P4S3
B)8P4 + S8 → 8P4S3
C)3P4 + 4S8 → 3P4S3
D)8P4 + 3S8 → 8P4S3
4
Balance the equation Fe + S → Fe2S3.
A)2Fe + 3S → Fe2S3
B)3Fe + 2S → Fe2S3
C)2Fe + 2S → 3Fe2S3
D)4Fe + 3S → 2Fe2S3
5
Balance the equation NaN3 → Na + N2.
A)NaN3 → Na + 3N2
B)2NaN3 → 2Na + 3N2
C)3NaN3 → 3Na + 3N2
D)NaN3 → 2Na + 3N2
6
Balance the equation C3H8 + O2 → CO2 + H2O.
A)2C3H8 + 5O2 → 2CO2 + 4H2O
B)C3H8 + 4O2 → 3CO2 + 4H2O
C)C3H8 + 5O2 → CO2 + 4H2O
D)C3H8 + 5O2 → 3CO2 + 4H2O
7
Balance the equation K + H2O → KOH + H2.
A)2K + H2O → 2KOH + H2
B)2K + 2H2O → 2KOH + H2.
C)K + 2H2O → 2KOH + H2
D)3K + 3H2O → 3KOH + H2
8
Balance the equation HgO → Hg + O2.
A)2HgO → Hg + 2O2
B)2HgO → 2Hg + 2O2
C)2HgO → 2Hg + O2
D)2HgO → Hg + O2
9
Balance the equation KClO3 → KCl + O2.
A)2KClO3 → 2KCl + O2
B)2KClO3 → 2KCl + 3O2
C)KClO3 → KCl + 3O2
D)KClO3 → KCl + O2
10
Balance the equation Mg + O2 → MgO
A)2Mg + O2 → 2MgO
B)Mg + O2 → 2MgO
C)Mg2 + O → 2MgO2
D)Mg + O → 2MgO
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