Define :

(a) a physical change

(b) a chemical change

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Solution

(a) Physical Change: A physical change is a temporary change in which no new substance is formed and the chemical composition of the original substance remains the same, even though its physical
properties like colour, state, shape, size etc. might change.
(b) Chemical Change: A chemical change is permanent change in which new substances are formed
whose chemical composition and physical and chemical properties are different from those of in original substance

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Similar questions

Q. (a) What is a physical change ? Give two examples of physical changes.
(b) What is a chemical change ? Give two examples of chemical changes.

Question 7

Neutralisation reaction is a
(a) physical and reversible change.
(b) physical change that cannot be reversed.
(c) chemical and reversible change.
(d) chemical change that cannot be reversed.

Q. Define physical and chemical change and give two suitable examples for each.

The rusting of an iron object is called:

(a) corrosion and it is a physical as well as a chemical change

(b) dissolution and it is a physical change

(d) dissolution and it is a chemical change

Q. Question 2
Rusting of an article made up of iron is called

(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change

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Physical and Chemical changes

Standard IX Chemistry

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Define : (a) a physical change (b) a chemical change

Define :

(a) a physical change

(b) a chemical change