differences between physical change and chemical change
Answers
Answer:
In physical change the objects undergo changes in physical state , shape, size and colour whereas in chemical changes the object undergo changes into another substance when suitable substances are mixed in appropriate amount
Answer:
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 Example Some example of physical change are freezing of water, melting of wax, boiling of water, etc.
A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
3 Reversibility Physical change is easily reversible i.e original substance can be recovered.
Chemical change is irreversible i.e. original substance cannot be recovered.
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 Type of Change- Physical change is a temporary change.
Chemical change is a permanent change.
6 Energy Production- In a physical change, no energy is produced.
In a chemical change, energy is produced (heat, light, sound, etc.)
7 Absorption of Energy- Physical change involves very little to no absorption of energy.
During chemical reaction, absorption and evolution of energy takes place.
8 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
Explanation: