MEDIUM
7th ICSE
IMPORTANT
Earn 100

Dissolving salt in water is a physical change. Why?

Important Questions on Physical and Chemical Changes

MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 11
Discuss why the dissolving of salt in water is a physical change.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 12
What type of change in the change of colour of the apple slice is? Why?
HARD
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 13
What is the importance of chemical changes?
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 14
A change involves energy. Explain giving an example.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 1
When is a change said to have taken place in a material? Explain with the help of an example.
 
HARD
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 2
Does the change in a material (or object) occur on its own? Explain your answer with the help of an example.
HARD
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 3
When a candle burns, both physical and chemical changes take place. Identify these changes.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 2 - Physical and Chemical Changes>EXERCISES>Q 4

Differentiate the following:

a. Physical and chemical changes