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:
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.
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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