Question

Definition of chemical reactions.

Answer 1

Chemical reaction is the process in which new substances with new properties are formed.

The substances that take part in a chemical reaction are called reactants.

The substances that are produced in a chemical reaction are called products.

Example -
2Mg + O2 ----> 2MgO

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Answer 2

chemical reaction is a change in which a new chemical substance is formed .
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reactants - the substances that undergo chemical changes.

products - the new substances formed after the reaction of the reactants.
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the different types of chemical reations are -

1) combination reaction
2)decomposition reaction
3)displacement reaction
4)double decomposition reaction
5)catalytic reaction
6)reversible reaction.
7)thermal dissociation.
8)redox reaction