Differentiate between physical and chemical change. Give one example of each. Give one example where both physical and chemical change is taking place.
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S.No.
Differentiating Property
Physical Change
Chemical Change
1
Explanation
In a physical change, the molecules are rearranged while their actual composition remains same.
In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.
2
Type of Change
Physical change is a temporary change.
Chemical change is a permanent change.
3
Energy Production
In a physical change, no energy is produced.
In a chemical change, energy is produced (heat, light, sound, etc.
4
Formation of new substance
In physical change, no new substance is formed.
A chemical change is always accompanied by one or more new substance(s).
5
Affects
Physical change affects only physical properties i.e. shape, size, etc.
Chemical change both physical and chemical properties of the substance including its composition.
Example of a change that is both chemical and physical is the burning of wood.
Another example is eating chocolate, which is both a physical change (breaking of chocolate into smaller pieces or melting of chocolate) and a chemical change (breaking of chocolate molecules into simpler molecules, etc).
art

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