Humboldt State University ® Department of Chemistry

Richard A. Paselk


General Chemistry

Fall 2009


© R. Paselk 2008

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Balancing Chemical Equations by Inspection

Balance the equations below by providing the proper coefficients:

(Examples 1-5 are answered with explanations, a-e are provided for extra practice - answers only are given.)

1. Al(s) + Fe2O3 (s) Fe(s) + Al 2O3 (s)

2. KClO3 (s) + heat KCl(s) + O2 (g)

3. C4H10 (g) + O2 (g) CO2 (g) + H2O(g)

4. N2 (g) + H2 (g) NH3 (g)

5. P4 (s)+ F 2 (g) PF5 (g)

Answers 1-5

a. Cu(s) + AgNO3 (aq) Cu(NO3)2 (aq) + Ag(s)

b. Fe(s) + O2 (g) Fe2O3 (s)

c. FeCl3 (s) + H2O(l) HCl(aq)+ Fe(OH)3 (s)

d. Zn(NO3)2 (s) + heat ZnO(s) + NO2 (g) + O2 (g)

e. H3PO4 (l) + heat H2O(l) + P4O10 (s)

Answers a-e

In addition to these exercises you should familiarize yourself with the text materials.

Go to Reflection Questions

© R A Paselk

Last modified 24 September 2009