MEDIUM
7th CBSE
IMPORTANT
Earn 100

Discuss why the dissolving of salt in water is a physical change.

Important Questions on Changes and Reactions

EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q B
Discuss an example of physical and chemical changes happening together.
MEDIUM
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q C
Giving one example of each kind, show that a change in energy takes place when a physical or a chemical change occurs.
MEDIUM
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q C
Describe an activity to find the conditions required for rusting.
MEDIUM
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q D
Which of the following is not a reversible change?
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q D
Which of the following is a reversible change?
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q D
During which of the following changes are new substances formed?
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q D
Rusting takes place in _____.
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 3 - Changes and Reactions>Exercises>Q D
In which of the following process is light absorbed?