NCERT Solution for Class 9 Science Chapter 2
Is Matter Around Us Pure
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-24
Questions No-1
- cutting of trees,
- melting of butter in a pan,
- rusting of Almira,
- boiling of water to form steam,
- passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
- dissolving common salt in water,
- making a fruit salad with raw fruits, and
- burning of paper and wood.
• Melting of butter in a pan → Physical change
• Rusting of almirah → Chemical change
• Boiling of water to form steam → Physical change
• Passing of electric current through water, and water breaking down into hydrogen and oxygen gas → Chemical change
• Dissolving common salt in water → Physical change
• Making a fruit salad with raw fruits → Physical change
• Burning of paper and wood → Chemical change
Cutting of trees→ Physical change
Melting of butter in a pan → Physical change
Rusting of almirah → Chemical change
Boiling of water to form steam → Physical change
Passing of electric current through water, and water breaking down into hydrogen and oxygen gas → Chemical change
Dissolving common salt in water → Physical change
Making a fruit salad with raw fruits → Physical change
Burning of paper and wood → Chemical change
1. Cutting of trees: Physical change.
2. Melting of butter in a pan: Physical change.
3. Rusting of Almira: Chemical change.
4. Boiling of water to form steam: Physical change.
5. Passing of electric current through water, breaking it down into hydrogen and oxygen gases: Chemical change (electrolysis).
6. Dissolving common salt in water: Physical change.
7. Making a fruit salad with raw fruits: Physical change.
8. Burning of paper and wood: Chemical change (combustion).
Physical changes involve alterations in the state or appearance of matter without changing their chemical composition, while chemical changes result in the formation of new substances with different chemical properties.