Physical and Chemical Changes (Practice Sheet, Class 7)

1) What is rusting? Give an example of it?

Solution 1:-

2) Define chemical change with examples.

Solution 2:-

3)Identify physical change and chemical change involved in the following processes:

(i) Burning of wood

(ii)Cutting vegetables

(iii)Rust on nail

(iv) Making crystal of salt

Solution 3 :-

4) Why dissolving of salt in water is a physical change?

Solution 4:-

5)Cooking omelets is a chemical change. Give reason.

Solution 5 :-

6)Fill in the blanks:

(i) ……is an example of physical change.

(ii)The process of depositing a layer of zinc on iron is called…..

(iii) The colour of copper sulphate solution is….

Solution 6 :-

7) Write ‘T’ if statement is true and write ‘F’ if statement is false.

(i) Blowing balloon is a chemical change.

(ii) Photosynthesis is a chemical change.

(iii) Steel does not rust.

Solution 7 :-

8) Why iron chair in garden acquire a brown colour substance after some time?

Solution 8 :-

Choose the correct answer:

9) Inflating of bicycle tube is a

(i)chemical change.

(ii)physical change.

Solution 9 :-

10) Making chocolate shake is a

(i) physical change.

(ii) chemical change.

Solution 10 :-

 

Helping Topics

Physical and chemical changes

Effect of Magnesium hydroxide on litmus paper

Physical and Chemical changes of a burning candle

Physical and chemical changes of making paper 

Burning of wood and cutting it into small pieces are considered as two different types of changes

Rusting of iron objects is faster in coastal areas than in deserts

Identification of Physical and Chemical changes in different processes

NCERT solutions class7

Picture1

 

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