Question

What is a chemical reaction? What are the types? Write the definition for each with examples.

Answer 1

CHEMICAL REACTION :
A chemical change in which elements or compounds ( the reactants ) , form new compounds ( the product ) is called a chemical reaction.
TYPES OF CHEMICAL REACTION :
Combination reaction
Decomposition reaction
Displacement reaction
Double displacement reaction
Exothermic reaction
Endothermic reaction
Thermal decomposition reaction
Electrolytic decomposition reaction
Oxidation reaction
Reduction reaction
Redox reaction

Answer 2

Chemical reaction:-
A chemical change which occurs when two or more substances react each other to form new substance.
There are 4 types of chemical reactions. They are:-
(1)Chemical combination reaction.
It is a chemical reaction in which two or more compounds react each other to form one product.
C+O2-----------=>CO2

(2)Chemical Decomposition reaction.
It is a chemical reaction in which a single compound breaks into two or more new compounds.
CuCO3-------------=>CuO+CO2

(3)Chemical displacement reaction.
It is a chemical reaction in which a more reactive element displaces a less reactive element.
2Na+2HCl---------------=>2NaCl+H2

(4)Chemical double displacement reaction.
It is a chemical reaction in which one component each of both the reacting molecules is exchanged to form the products.
BaCl2 +MgSO4------=>BaSO4+MgCl2

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