Chemical reactions and Equations long 2

Question 1

What are exothermic reaction and give a example ?

Answer 1

Reactions in which heat is released along with the formation of products are called exothermic chemical reaction. example of exothermic reactions are –
(i) Burning of natural gas
CH2 + 2O^2 → CO2 + 2H^2^O

Question 2

What is respiration and kind of reaction is it and give the formula ?

Answer 2

Carbohydrates are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. The special name of this reaction is respiration. It is a exothermic reaction.

Formula - C6 H12 O6 + 6 O^2 → 6CO^2+ 6H^2^O + energy

Question 3

Give what happens in a ferrous sulphate activity and give formula.

Answer 3

/ The ferrous sulphate crystals are light green in colour.
/ The gas emitted has the odor of burning Sulphur.
/ On heating, the colour changes from light green to white.
/ On further heating, the white substance changes to dark brown.

Formula - 2FeSO^4 Heat→Fe2O^3 + SO2 + SO3