CBSE Worksheet for chapter-2 Is Matter Around Us Pure class 9

Worksheet For class 9

Find CBSE Worksheet for chapter-2 Is Matter Around Us Pure class 9

CLASS-9

BOARD: CBSE

Chemistry Worksheet - 2

TOPIC: Is Matter Around Us Pure

For other CBSE Worksheet for class 9 Science check out main page of  Physics Wallah.

IS MATTER AROUND US PURE

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Is Matter is around us

Summary

• Classification of matter based on chemical composition (properties).
• Elements, metals, non-metals, metalloids.
• Mixtures – homogeneous and heterogeneous.
• Compounds and its properties.
• Difference between –

1. Elements and compounds.
2. Mixtures and compounds.

• Solutions – true solution, colloidal and suspension.
• Concentration of solution – (weight-weight, weight-volume).
• Saturated and unsaturated solutions, solubility.
• Physical and chemical changes.

Separation of mixtures –

1. Solid-solid (by suitable solvent, sublimation, magnet).
2. Solid-liquid (by filtration, configuration, evaporation, crystallization, chromatography, distillation).
3. Liquid-liquid (by fractional distillation, separating funnel).
4. City water supply.

Section-1

1. Which of the following is an example of homogeneous mixture ?
   1. Brass
   2. Muddy water
   3. Soil
   4. All
2.  Soda is an example of :
   1. gas in a liquid mixture
   2. liquid in a gas mixture
   3. solid in a solid mixture
   4. solid in a gas mixture
3. The smell of perfume spreads out by a process known as –
   1. evaporation
   2. diffusion
   3. condensation
   4. fusion
4. Which of the following processes is used to obtain pure water from a common salt solution ?
   1. Filtration
   2. Distillation
   3. Fractional distillation
   4. None of these
5. We can get a pure liquid from a solution by –
   1. distillation
   2. crystallization
   3. evaporation
   4. sedimentation
6. Which of the following is a compound ?
   1. air
   2. milk
   3. iodine
   4. water
7. The concentration of the solution is the mass of the solute in grams , which is present in –
   1. 10gm of solvent
   2. 10gm of solution
   3. 100gm of solvent
   4. 100gm of solution
8. Which of the following will show Tyndall effect ?
   1. Starch solution
   2. Sodium chloride solution
   3. Copper sulphate solution
   4. Sugar solution
9. Which of the following statement is not true about suspension ?
   1. The particles of suspension can be separated from solvent by the process of filtration.
   2. When the suspension is kept undisturbed the particles of suspension settle down.
   3. A suspension is homogeneous in nature.
   4. Scattering of light takes place in suspension.
10. Which of the following method is used for separation of different components of petroleum ?
    1. Fractional distillation
    2. Sublimation
    3. Chromatography
    4. Simple distillation

Section-2

1. How much water should be added to 15 grams of salt to obtain 15 percent salt solution ?
2. Explain why, water is a compound and not a mixture ?
3. Write the difference between colloid, suspension and true solution ?
4. How will you separate iron filings, ammonium chloride and sand from their mixture ?
5. Give the example of each of the following :
   Emulsion, Gel, Aerosol and Foam.

6. Write applications of centrifugation.