What do you understand by exothermic and endothermic reactions?
(b) Give one example of an exothermic reaction and one of an endothermic reaction.
(c) Which of the following are endothermic reactions and which are exothermic reactions?
(i) Burning of natural gas
(ii) Photosynthesis
(iii) Electrolysis of water

Solution:

(iv) Respiration
(v) Decomposition of calcium carbonate

Question

What do you understand by exothermic and endothermic reactions?
(b)	Give one example of an exothermic reaction and one of an endothermic reaction.
(c)	Which of the following are endothermic reactions and which are exothermic reactions?
(i)	Burning of natural gas
(ii)	Photosynthesis
(iii)	Electrolysis of water
 


Solution:
 
(iv)	Respiration
(v)	Decomposition of calcium carbonate

MyClass24 · Accepted Answer

Exothermic reaction is a reaction takes place when energy is released from the system into the surroundings

Endothermic reaction is a reaction takes place when energy is absorbed from surroundings in the form of heat

The thermal decomposition of Limestone

CaCO3(s)&rarr;CaO (s)+CO2(g) This is an example for endothermic reaction Burning of fuel is an example for exothermic reaction C8H18(l)+25O2(g)&rarr;16CO2(g)+18H2O (g)+heat

(i) and (iv) are exothermic (ii),(iii),(v) are endothermic reactions