Chapter: 11th 12th std standard Class Organic Inorganic Physical Chemistry Higher secondary school College Notes
Different between Exothermic and endothermic processes
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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