Q24 of 28 Page 14

Write a balanced chemical equation for the reactions that take place during respiration. Identify the type of combination reaction that takes place during this process and justify the name. Give one more example of this type of reaction.

Balanced chemical equation for the reactions that take place during respiration is:

C6H12O6 + 6O2→ 6CO2 + 6H2O


There are two types of combination reaction:


i. Exothermic reaction: It is a reaction in which heat is released when reactants change into products.


ii. Endothermic reaction: It is a reaction in which energy is absorbed.



Respiration is considered as an exothermic reaction because, in respiration, a large amount of heat energy is released when oxidation of glucose takes place.


One more example of exothermic reaction is burning of natural gas:


CH4 + 2O2→ CO2 + 2H2O


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