What is chemical combination and chemical decomposition with examples

Question

Definition of chemical combination with examples and laws of chemical combination

Definition of chemical decomposition with examples and types of chemical decomposition

Answer 1

Chemical Combination:
Two or more substances combined to form a single substance is called chemical combination
A +B -> AB
Example:

1.     2mg + O2 → 2mgO
2.     NH3 +  HCl → NH4Cl

Three laws of chemical combination

• Law of Conservation of Mass
• Law of Definite Proportions.
• Law of Multiple Proportions.
• Gay Lussac's Law of Gaseous Volumes.
• Avogadro's Law.

Chemical Decomposition:

Single substance splits into two or more substances is called chemical decomposition
AB -> A + B
Example:

1.     CaCO3 → CaO + CO2
2.     Pb(NO3)2 → 2PbO +O2 +NO2

Types of Chemical decomposition

• Thermal decomposition reaction.
• Electrolytic decomposition reaction.
• Photo decomposition reaction.