Question

what is chemical reactions four types of chemical reations **two exmples of too types of chemical reations you have listed in question 2describe the process of birth

Answer 1

Answer:

four types of chemical reaction is combination reaction, decomposition reaction, displacement reaction and double displacement reaction

Ex. Mg +O ≈ MgO

CaCO3 ≈ Cao + co2

I'm using ≈ instead of arrow

Answer 2

Answer:

The four types of chemical reactions are as follow:

1. combination reaction : That type of reaction in which two or more than two elements or compounds react together to form a single product.

for ex. Cu + O2 ——> CuO

H2 + O2 ——> H2O

here, only single product is forming, that's why it's a combination reaction.

2. Decomposition reaction : That type of reaction in which a single reactant decomposes to give two or more than two products on supplying energy.

for ex. CaCO3 ——> CaO + CO2

Zn(OH) 2 ——> ZnO + H2O

here, a single reactant is decomposing to give two or more than two products , that's why it's a decomposition reaction. It's opposite to combination reaction.

3. Displacement reaction: That type of reaction in which a more reactive element displaces less reactive element from it's compound. It will become more clear my knowing about the reactivity series.

for ex. Zn + CuSO4 ——> ZnSO4 + Cu

here, Zn is more reactive than copper hence it is displacing it from it's compound.

Mg + Al2(SO4) 3 ——> MgSO4 + Al

in both reaction a more reactive element is displacing less reactive element from their compounds. hence, it's a displacement reaction.

4. Double Displacement Reaction: That type of reaction in which elements are exchanged among compounds. means two times displacement takes place.

for ex. Pb(NO3) 2 + KI ——> PbI2 + KNO3

Na2SO4 + BaCl2 ——> NaCl + BaSO4

in both reactions the compounds are exchanging their elements among themselves....

hence, it is a double displacement reaction..

hope it will help you....