Chemical reactions
Combination Reactions
A+Z
AZ
1. Metal + oxygen
metallic oxide
2 Mg + O2
2MgO
2. Non metal + oxygen
non metallic oxide
C + O2
CO2
3. Metal + non metal
salt
2 Na + Cl2
2NaCl
4. Water + metallic oxide
base
H2O + MgO
Mg(OH)2
5. Water + non metallic oxide
ox acid
H2O + SO3
H2SO4
Decomposition Reactions
AZ
A+Z
1. Metallic Carbonate and acid carbonates decompose to produce carbon dioxide gas
2 NaHCO3
Na2CO3 + CO2 + H2O
CaCO3
CaO + CO2
2. Others decompose to produce oxygen gas
2HgO
2Hg + O2
2 KClO3
2KCl + 3O2
Practice problems:
For the following equations, predict its products and balance it.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Al2O3 + H2O
CaO + SO3
N2O5 + H2O
NaNO3
Al + O2
MgCO3
Na2O + H2O
NaHCO3
BaO + SO3
KClO3
C + O2
Ca(HCO3)2
NaCl
Si + O2
Ba(HCO3)2
Mg + S
MgO
Al + N2