EASY
7th CBSE
IMPORTANT
Earn 100

Classify the following process into physical or chemical change:

Cutting of a log of wood into pieces.

Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>SHORT ANSWER QUESTIONS>Q 16

Classify the following process into physical or chemical change:

Burning of crackers.

MEDIUM
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>SHORT ANSWER QUESTIONS>Q 17
Write word equations for two chemical reactions with the help of materials given in the box.
[Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water]
MEDIUM
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>SHORT ANSWER QUESTIONS>Q 18

Explain the following:

Lime water turns milky on passing carbon dioxide gas into it.

MEDIUM
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>SHORT ANSWER QUESTIONS>Q 18

Explain the following:

Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.

EASY
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>LONG ANSWER QUESTIONS>Q 19

Give two examples for the following case:

Physical changes which are reversible.

EASY
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>LONG ANSWER QUESTIONS>Q 19

Give two examples for the following case:

Physical changes which are not reversible.
EASY
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>LONG ANSWER QUESTIONS>Q 19

Give two examples for the following case:

Chemical changes.
 
MEDIUM
7th CBSE
IMPORTANT
NCERT Exemplar Science - Class 7>Chapter 6 - Physical and Chemical Changes>LONG ANSWER QUESTIONS>Q 20

Give an example of a chemical reaction for the following situation:

A change in colour is observed.