SNC2D
Grade 10 Academic Science
Unit 3: Chemical Reactions
Activity 5: Balancing Chemical Equations
Balancing Chemical Equations
Assignment 2
Instructions
1. For each word equation below provide the skeleton equation; then balance the skeleton
equation. Remember to include all the states of matter.
a) methane + oxygen → carbon dioxide + water
skeleton equation:
balanced equation:
b) sodium + chlorine → sodium chloride
skeleton equation:
balanced equation:
c) iron(II) oxide → iron + oxygen
skeleton equation:
balanced equation:
d) cupric oxide → copper + oxygen
skeleton equation:
balanced equation:
e) calcium + water → calcium hydroxide + hydrogen gas
skeleton equation:
balanced equation:
U03A05_Assignment 2
SNC2D
Grade 10 Academic Science
Unit 3: Chemical Reactions
Activity 5: Balancing Chemical Equations
2. Write a word equation to represent each of the following reactions. Then balance each
equation including all the states of matter.
a) Solid aluminum metal combines with fluorine gas to produce solid aluminum fluoride.
word equation:
balanced equation:
b) Potassium metal combines with oxygen gas to produce solid potassium oxide.
word equation:
balanced equation:
c) Lithium sulphate combines with barium chloride and produces solid barium sulphate and
aqueous lithium chloride. Both of the reactants are dissolved or are soluble in water
(aqueous).
word equation:
balanced equation:
d) Aluminum chloride reacts with sodium carbonate and yields aluminum carbonate and sodium
chloride. Aluminum carbonate forms a solid precipitate while aluminum chloride, sodium
carbonate, and sodium chloride are all soluble in water.
word equation:
balanced equation:
e) The complete combustion of propane (C3H8) gas results in the production of carbon dioxide
and water vapour (remember that combustion reactions can only occur in the presence of
oxygen gas).
word equation:
balanced equation:
3. Use the space on the next page (below) to draw a molecular model diagram which depicts
the reaction of copper(aq) and lead(II)sulphate(s) to form copper(I)sulphate(s) and lead(aq).
Make sure the reaction is balanced.
U03A05_Assignment 2