Question

explain these
1) combination reaction
2) exothermic reaction
3)decomposition reaction
4) endothermic reaction
5)corotion

Answer 1

combination reaction:
in combination reaction two or more reactants combine to form a single product.

exothermic reaction:
it is a reaction that release or gives of energy during the reaction.exo which means to exit and therm which means heat.

decomposition reaction:
it is a reaction in which a single compound break down into two or more elements or new compound.

endothermic reaction:
are those reaction which require energy that is a reactant require energy externally to get converted into product.

corroison:
the chemical process of slow eating up of the surface of certain metal kept in open for a long time.
example rusting or iron article

I HOPE IT'S HELPFUL TO YOU

Answer 2

1) Reaction in which two or more reactants react to form a single product is known as Combination reaction.An easy

eg. 2H2+O2 ----> 2H2O

2) Reaction in which heat is released is known as exothermic reaction.

An easy eg:

CH4+2O2 -----> CO2 + 2H2O

3) The reaction in which a single compound decomposes to give simpler products is known as decomposition reaction.It is also known as opposite of combination reaction. an easy eg:

CaCO3 -----> CaO + CO2

4) The reaction in which energy is absorbed is known as endothermic reaction. An easy eg:

N2 + O2 + 180.5 KJ -----> 2NO.

5) When a metal comes in contact with moist air it forms its oxide and said to be corrode.

Eg. Cu+CO2+H2O+O2-->

CuCO3.Cu (OH)2