CBSE-IX-Science
06: 1-Is Matter around Us Pure
- #Section : IV
- Qstn #1Classify the following as chemical or physical changes:
• cutting of trees,
• melting of butter in a pan,
• rusting of almirah,
• 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.
Ans : cutting of trees = chemical 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 the water breaking down into hydrogen and oxygen gases = 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
- Qstn #2Try segregating the things around you as pure substances or mixtures.Ans : You can do it by yourself like try mixing chalk powder and water then separate them.