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NCERT SOLUTION

CLASS 9

CHAPTER 2

IS MATTER AROUND US PURE

PAGE NO. 24

QUESTION NO. 1

Classify 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.

ANSWER NO. 1

  1. Cutting of trees is a physical change.
  2. Melting of butter in a pan is a physical change.
  3. Rusting of almirah is a chemical change.
  4. Boiling of water to water to form a stream is a physical change.
  5. Passing of electric current, through water and water breaking down into hydrogen and oxygen gases - chemical change.
  6. Dissolving common salt in water - physical change.
  7. Making fruit salad with raw fruits - physical.
  8. Burning of paper and wood - chemical change.

QUESTION NO. 2

Try segregating the things around you as pure substances or mixtures.

ANSWER NO. 2

A pure substance is made up of only one type of atoms or molecules where as mixtures are made up of combination of different types of particles.
       Some of the things around us are -
Wood, air, milk, tap water, sodium chloride, gold ornament, alcohol, vinegar, diamond, steel, ice cream, naphthalene balls, baking soda, graphite, salt solution, alum, kerosene oil, steam etc. out of these 
   Pure substances are -
Naphthalene balls, sodium chloride, distilled water, diamond, steam, alum, alcohol, graphite, baking soda.

    MIXTURE 

  Tap water, milk, air, gold ornament, ice cream, steel, kerosene oil, salt solution, brass, vinegar, wood.
Km


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