Explain the following reactions with example. 1. Neutralization reaction 2. Decomposition reaction

Question

Explain the following reactions with example.

1. Neutralization reaction
2. Decomposition reaction
3. Exothermic reaction
4. Endothermic reaction

Answer 1

1. Neutralization reaction:
The reaction in which acid or acidic oxide react with base or basic oxides to form salt and water is called neutralization reactions.

2. Decomposition Reaction:
The reaction in which a single reactant breaks into two or more simpler products is called decomposition reaction.
Example: When powdered lime is heated, a gas is evolved. This gas is passed through lime water, lime water turns milky. This gas is carbon-dioxide(CO₂) gas. When calcium carbonate is heated, it forms carbon dioxide gas.
                          ‘
Calcium carbonate Calcium oxide Carbon dioxide

3. Exothermic Reactions:
Reactions accompanied with release of heat are called exothermic reactions. Release of heat is shown by writing ‘+ heat’ on right- hand side of the equation. All burning reactions are exothermic. When carbon bums in air heat is released.
C+ O₂ → CO₂ + heat
4. Endothermic reactions: Reactions accompanied with absorption of heat are called endothermic reactions. Absorption of heat is shown by writing – heat on right- hand side or + heat on the left- hand side of the equation.
Example:
When carbon and sulphur are heated they react to form carbon disulphide. Heat is absorbed in the reaction
C+2S → CS₂ – heat