Question

What is the difference between physical and chemical change(in points)

Answer 1

Chemical change:

1) In a chemical change new substances are formed.
2) It is an irreversible change.
3) Some examples of chemical change are burning of sugar, burning of newspaper etc.
4) Properties of chemical changes are heat of combustion and toxicity.

Physical change:

1) In a physical change no new substances are formed.
2) It is a reversible change.
3) Some examples are melting of ice, melting of wax etc.
4) Properties of physical changes are melting, boiling.


Hope this helps. Thank you.

Answer 2

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➤ Chemical change :-

☛ A permanent change ,in which the physical and chemical properties of matter changes and new substance are formed which do not get back into their original form by reversing the reaction is called chemical change.

For example :- The burning of coal or wood, the curdling of milk, forming of rust on iron etc.

➤ Physical change:-

☛ A temporary change,in which only the physical properties of the matter change and no new matter is formed and by reversing the reaction the matter changes into it's previous form is called physical change.

For example :- The melting of solid wax,the melting of ice etc.