Science 10
Balancing Chemical Equations
Practice Problems p. 211
1.Balance each of the following skeleton equations.
a. ___ NaI + ___ AlCl3 →___ NaCl + ___ AlI3
b. ___ Li + ___ Br2 → ___ LiBr
c. ___ CH4 + ___ O2 → ___ CO2 + ___ H2O
d. ___ PbO → ___ Pb + ___ O2
e. ___ Na4C + ___ Ca → ___ Na + ___ Ca2C
f. ___ C3H8 + ___ O2 → ___ CO2 + ___ H2O
g. ___ Ca(NO3)2 + ___ Cu2SO4 → ___ CaSO4 + ___ CuNO3
h. ___ Na3N → ___ Na + ___ N2
i. ___ Mg(ClO4)2 + ___ Na → ___ NaClO4 + ___ Mg
j. ___ AlCl3 → ___ Al + ___ Cl2
Examples
2.Write the skeleton equation for each of the following reactions. Then balance each of
the equations.
a. nitrogen monoxide + oxygen → nitrogen dioxide
b. iron(III) bromide + sodium hydroxide → sodium bromide + iron(III) hydroxide
c. methane + oxygen → carbon dioxide + water
d. calcium nitrate + potassium carbonate → potassium nitrate + calcium carbonate
e. phosphorous trichloride + chlorine → phosphorus pentachloride
f. potassium permanganate + nickel(II) nitrate → potassium nitrate + nickel(II) permanganate
g. iron + copper(II) chloride → iron(II) chloride + copper
h. sodium phosphate + barium hydroxide → sodium hydroxide + barium phosphate