Question

Write two change in which absorption of heat take place?​

Answer 1

Answer:-

• Photosynthesis: Plants absorb heat energy from sunlight to convert carbon dioxide and water into glucose and oxygen.
• Cooking an egg: Heat energy is absorbed from the pan to cook the egg.

Explanation:-

Endothermic reactions are the chemical reactions which proceed with the absorption of heat energy.

Consider the reaction A + B + q → C + D.

Here, q is the heat energy absorbed during this exothermic reaction.

The enthalpy change for this reaction is ΔH  

rxn

​  

=H  

products

​  

−H  

reactants

​  

=+q

Positive sign indicates that heat is absorbed in the reaction.

Hence, H  

reactants

​  

+q=H  

products

​  

 

Thus, in an endothermic reaction, the total enthalpy of reactant is  smaller than that of products.

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