Is Matter Around Us Pure

Is Matter Around Us Pure - NCERT Guide Science Class 9

Q1: Which separation techniques will apply for the separation of the following?
  1. Sodium chloride from its solution in water.
  2. Ammonium Chloride from a mixture containing Sodium Chloride and Ammonium Chloride.
  3. Small pieces of metal in the engine oil of a car.
  4. Different pigments from an extract of flower petals.
  5. Butter from curd.
  6. Oil from water.
  7. Tea leaves from tea.
  8. Iron pins from sand.
  9. Wheat grains from husk.
  10. Fine mud particles suspended in water.
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Q2: Write the steps you would use for making tea. Use the words - solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
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Q3: Explain the following giving examples:
  1. Saturated solution
  2. Pure substance
  3. Colloid
  4. Suspension
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Q4: Classify each of the following as a homogeneous or heterogeneous mixture: soda water, wood, air, soil, vinegar, filtrated tea.
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Q5: How would you confirm that a colourless liquid given to you is pure water?
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Q6: Which of the following materials fall in the category of a ‘pure substance’?
  1. Ice
  2. Milk
  3. Iron
  4. Hydrochloric acid
  5. Calcium oxide
  6. Mercury
  7. Brick
  8. Wood
  9. Air
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Q7: Which of the following will show “Tyndall effect”?
  1. salt solution
  2. milk
  3. Iron
  4. copper sulphate solution
  5. starch solution
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Q8: Classify the following into elements, compounds and mixtures.
  1. sodium
  2. soil
  3. sugar solution
  4. silver
  5. calcium carbonate
  6. tin
  7. silicon
  8. air
  9. soap
  10. methane
  11. carbon dioxide
  12. blood
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