Question

what is chemical reaction and give some examples

Answer 1

Chemical reaction state that a chemical change that occurs when two or more substances is called chemical reaction....
Example is fe(s)+S(s)=FeS(s)

Answer 2

chemical reaction occurs when one or more reactants react together under special conditions to form one or more products.

Examples:
1)CO2+H2O--)H2CO3
2)H2+O2--)H2O.