CH 2 CHEMICAL CHANGE AND REACTIONS

The chemical reaction in which a compound splits in two or more simpler substances is known as decomposition .

A decomposition reaction that is brought about by heat without any recombination on cooling is known as thermal decomposition .

The formation of gas bubbles in a liquid during a reaction is called effervescence .

A catalyst employed to retard the rate of reaction is known as a negative catalyst .

When catalyst accelerate the rate of reaction , it is known as a positive catalyst.

Substances that infulence the rate of a chemical reaction by improving the efficiency of the catalyst are called promoters.

It occurs when reactants are in close contact or by supply of energy.

It is a process of breaking the chemical bonds of the reacting substances and making new bonds to form new substances.

A chemical chnge is a permanent change in which the chemical composition of a substance is changed.