During a chemical reaction, the bonds of the reactants are broken. The atoms of the reactants are then rearranged to form new products. According to the law of conservation of matter, matter cannot be created nor destroyed. Therefore, chemical equations are balanced so that there are equal numbers of each type of atom on either side of the equation.
Chemical equations can be identified as being either decomposition, combination (synthesis), combustion, single replacement, or double replacement reactions. Here is an explanation of each type of chemical reaction.
Below, each the type of chemical reaction of each reaction has been identified. Then, the balanced chemical equation for each reaction was completed.
1. Double replacement:
BaCl2 (aq)+ 2 NaSO4 (aq) `->` Ba(SO4)2 (aq) + 2 NaCl (s)
2. Single replacement:
2 Al (s)+3 CuCl2 `->` 2 AlCl3 (aq)+ 3 Cu (s)
2 C6H6+ 15 O2 `->` 12 CO2 + 6 H2O
Pb(NO3)2+ 2 HCl `->` PbCl2 + 2 HNO3
FeCl2+2 NaOH `->` Fe(OH)2 + 2 NaCl