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Chapter: 11th 12th std standard Class Organic Inorganic Physical Chemistry Higher secondary school College Notes

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Different between Exothermic and endothermic processes

When the thermodynamic process is a chemical reaction or a physical transformation, process is classified as either exothermic or endothermic depending on the nature of heat involved in the over all process. These two processes are differentiated as follows:

Exothermic and endothermic processes

 

When the thermodynamic process is a chemical reaction or a physical transformation, process is classified as either exothermic or endothermic depending on the nature of heat involved in the over all process. These two processes are differentiated as follows:


Endothermic process

 

1.     A  process  when  transformed  from initial to final states by absorption of heat  is  called  as  an  endothermic process.

 

2.     The final state of the system possesses higher energy than the initial state. The excess  energy  needed  is  absorbed  as heat   by   the   system   from   the surroundings.

 

3.     Generally in a physical transformation which is endothermic heat is supplied to bring about the initial to final state.

4.     Example:   melting   of   a   solid   by supplying   heat   is   an   endothermic process.

 

Exothermic process

 

1.     A  process  when  transformed  from initial to final states by evolution of heat is called as exothermic process.

 

2.     The final state of the system possesses lower energy than the initial state. The excess  energy  is  evolved  as  heat. Example:  All  combustion  processes are exothermic.

 

3.     If  the  physical  transformation  is exothermic heat is removed to bring about   the   initial   to   final   state.

4.     Example: Freezing of a liquid at its freezing   point   is   an   exothermic process.



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