6. write the difference between Phyiscal and chemical
Changes
alog with few example?
Answers
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.Some example of physical change are freezing of water, melting of wax, boiling ofwater, etc.
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Physical Change
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1) Explanation
In a physical change, the molecules are rearranged while their actual composition remains same.
2) Example
Some example of physical change are freezing of water, melting of wax, boiling of water, etc.
3) Reversibility
Physical change is easily reversible i.e original substance can be recovered.
4) Formation
formation of new substance In physical change, no new substance is formed.
5) Type of Change
Physical change is a temporary change.
6 ) Energy Production
In a physical change, no energy is produced .
7) Absorption of Energy
Physical change involves very little to no absorption of energy
8 ) Affects
Physical change affects only physical properties i.e. shape, size, etc.
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Chemical Change
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1) Explanation
In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.
2) Example
A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
3) Reversibility
Chemical change is irreversible i.e. original substance cannot be recovered.
4) Formation
A chemical change is always accompanied by one or more new substance(s).
5) Type of Change
Chemical change is a permanent change.
6) Energy Production
In a chemical change, energy is produced (heat, light, sound, etc.)
7 ) Absorption of Energy
During chemical reaction, absorption and evolution of energy takes place.
8) Affects
Chemical change both physical and chemical properties of the substance including its composition.