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Home» class 9»Science» Chapter 2: Is Matter Around Us Pure

Classify the following into elements, compounds and mixtures.(... - Science

Question

Classify the following into elements, compounds and mixtures.
(a) Sodium
(b) Soil
(c) Sugar solution
(d) Silver
(e) Calcium carbonate
(f) Tin
(g) Silicon
(h) Coal
(i) Air
(j) Soap
(k) Methane
(l) Carbon dioxide
(m) Blood

Answer

Elements:

  • Sodium

  • Silver

  • Tin

  • Silicon

Compounds:

  • Calcium carbonate

  • Soap

  • Methane

  • Carbon dioxide

Mixtures:

  • Soil

  • Sugar solution

  • Coal

  • Air

  • Blood

 

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Differentiate between homogeneous and heterogeneous mixtures with examples.

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How are sol, solution and suspension different from each other?

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To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.

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Classify the following as chemical or physical changes:
• cutting of trees,
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Which separation techniques will you apply for the separation of the following?
(a) Sodium chloride from its solution in water
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride
(c) Small pieces of metal in the engine oil of a car
(d) Different pigments from an extract of flower petals
(e) Butter from curd
(f) Oil from water
(g) Tea leaves from tea
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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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Pragya tested the solubility of three different substances at different temperatures and collected the data as given below
(results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

(a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?
(b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.
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(d) What is the effect of change of temperature on the solubility of a salt?

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Chapter Info

Subject: Science
Class: class 9
Chapter 2: Is Matter Around Us Pure
Medium: English Medium