Explain The relation between heat and the change of physical state?
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Physical change Chemical change
Only physical changes like odour, physical state, density, volume etc. changed and chemical properties remain unchanged The chemical composition and chemical properties undergo a change
No new substance is formed in a physical change. A new substance is formed in a physical change.
Very little or no energy in the form of heat, light or sound is usually absorbed or given out in a physical change A chemical change is always accompanied by absorption or evolution of energy
It is a temporary change It is a permanent change
The original form of substance can be regained by simple physical method Original substance cannot be obtained by simple physical method
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