Question: 10

State the differences between chemical and physical changes.

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Solution

Chemical change

Physical change

(i) It is generally an irreversible process.

(i) It is generally a reversible process.

(ii) A new substance is formed.

(ii) No new substance is formed.

(iii) Properties of a substance change.

(iii) Properties of a substance do not change.

(iv) Energy is given out or absorbed during the change.

(iv) No energy is given out or absorbed during the change.

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Question 6.

Write any two differences between a chemical change and a physical change.

Question 6

Classify the following changes as physical and chemical changes:

Write any two differences between a chemical change and a physical change.

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Chemical change	Physical change
(i) It is generally an irreversible process.	(i) It is generally a reversible process.
(ii) A new substance is formed.	(ii) No new substance is formed.
(iii) Properties of a substance change.	(iii) Properties of a substance do not change.
(iv) Energy is given out or absorbed during the change.	(iv) No energy is given out or absorbed during the change.