Question

define the following types of chemical changes or reactions with suitable example of each 1. direct combination reaction or synthesis 2. decomposition reaction 3. displacement reaction or substitution reaction 4. double decomposition reaction​

Answer 1

Explanation:

The main four types of reactions are direct combination, analysis reaction, single displacement, and double displacement. If you're asked the five main types of reactions, it is these four and then either acid-base or redox (depending who you ask).

please give 5 thanks in my answer.

Answer 2

Explanation:

1. Combination Reaction:-

When two or more substances (elements/compounds) combine together to form a single substance, it is called a combination reaction. This reaction involves in making of new bonds between atoms.

eg. 2Na + Cl2 --------> 2NaCl

2. Decomposition Reaction:-

When one substance breaks down into two or more substances, it is called decomposition reaction. There are two types if decomposition reaction:-

(i) Thermal Decomposition Reaction:-

When the decomposition reaction happens with the absorption of heat, it is thermal decomposition reaction.

eg. FeSO4 ---------> Fe2O3 + SO2 + SO3

(ii) Photolytic Decomposition Reaction:-

When the decomposition reaction takes place with light, it is called photolytic decomposition reaction.

eg. 2AgCl(in the presence of sunlight)------> Ag + Cl2

(iii) Electrolytic Decomposition Reaction:-

When energy is supplie in the form of electricity for breaking down the reactants, it is called electrolytic decomposition reaction.

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

3. Displacement Reaction:-

When more reactive elements displace a less reactive element from it's salt solution, it is called displacement reaction.

eg. Pb + CuSO4 --------> PbSO4 + Cu

4. Double Displacement Reaction:-

The reaction in which there is an exchange of ions/radicals between the reactants are called double displacement reactions.

eg. Pb(NO3)2 + KI --------> KNO3 + PBI2

Hope this helps you!!