Name ________________ ______________Class __________________ Date __________________
Word And Balanced Formula Equations
For each of the reactions below, write the word equation (a), and then the balanced formula
equation (b).
1. Example
Automobile airbags rely on the decomposition of the compound sodium azide (NaN3)
to produce the nitrogen gas needed to rapidly inflate the bag. Sodium is also produced
in the reaction. Write the balanced equation for this decomposition reaction.
a. Word equation
sodium azide(s)  nitrogen(g) + sodium(s)
b. Balanced formula equation
2NaN3(s)  3N2(g) + 2Na(s)
2. Acid indigestion can occur when the stomach produces too much hydrochloric acid.
An old and effective remedy for this involves drinking a solution of baking soda
(sodium hydrogen carbonate, NaHCO3), which reacts with the hydrochloric acid to
produce sodium chloride, water, and carbon dioxide. Write the balanced equation for
this reaction.
a. Word equation
b. Balanced formula equation
3. A problem with the remedy for acid indigestion given in the previous problem is that
the carbon dioxide produced can cause discomfort. In many modern antacids, the
active ingredient is magnesium hydroxide. Write the balanced chemical equation for
when magnesium hydroxide reacts with hydrochloric acid, forming water and
magnesium chloride.
a. Word equation
b. Balanced formula equation
Name ________________ ______________Class __________________ Date __________________
4. A useful single-displacement reaction involves thermite, which is a mixture of
aluminum and iron (III) oxide. When the thermite reaches a high temperature, the
components react to produce molten iron, aluminum oxide and a great deal of energy.
Write the balanced equation for the thermite reaction.
a. Word equation
b. Balanced formula equation
5. Aluminum sulfate decomposes to form aluminum oxide and sulfur trioxide.
a. Word equation
b. Balanced formula equation
6. Ammonium chloride reacts with calcium hydroxide to form calcium chloride
ammonia and water. Write the balanced equation for this reaction.
a. Word equation
b. Balanced formula equation
7. Calcium oxide reacts with sulfur dioxide to form calcium sulfite.
a. Word equation
b. Balanced formula equation
8. Antimony(V) chloride reacts with potassium iodide to form the products potassium
chloride, iodine, and antimony(III) chloride.
a. Word equation
b. Balanced formula equation
9. Vanadium (V) oxide reacts with calcium to form vanadium metal and calcium oxide.
a. Word equation
Name ________________ ______________Class __________________ Date __________________
b. Balanced formula equation
10. Chromium(III) oxide reacts with silicon to form chromium metal and silicon dioxide.
a. Word equation
b. Balanced formula equation
Grading scale 0-40
A: 36-40
B: 32-35
C: 28-31
D: 24-27
F: <24