CBSE Class 9 Chemistry Is Matter Around Us Pure Worksheet Set B

CBSE Class 9 Chemistry Worksheet - Is Matter Around Us Pure (2)

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Q.1 Two liquids ‘A’ and ‘B’ are miscible with each other at room temperature. Which separation technique will you apply to separate the mixture of ’A’ and ‘B’ if the difference in their boiling point is 27 deg C?

Q.2 Rain water stored in a tank contains sand grains, unfiltrable clay particles, calcium carbonate, salt, pieces of paper and some air bubbles. Select from amongst these one example each of a solvent, a solute, a colloid and a suspension.

Q.3 Suggest separation technique(s) one would need to employ to separate the following mixtures:
(a) Mercury and Water
(b) Potassium Chloride and ammonium chloride
(c) Common salt, water and sand
(d) Kerosene oil, water and salt

Q.4 Give some examples of Tyndall effect observed in your surrounding

Q5: differentiate between:
(a) true solution & a colloid
(b) metals & non-metals
(c) compound & mixtures
(d) physical & chemical changes.

Q.6: 0.5 g of salt is dissolved in 25g of water. Calculate the percentage amount of the salt in the solution.

Q.7: During an experiment the students were asked to prepare a 10% (Mass/Mass) solution of sugar in water. Ramesh dissolved 10g of sugar in 100g of water while Sarika prepared it by dissolving 10g of sugar in water to make 100g of the solution.
(a) Are the two solutions of the same concentration?
(b) Compare the mass% of the two solutions.

Q.8: Explain why filter paper cannot be used to separate colloids?

Q.9: A compound is regarded as a pure substance while the mixture is not. Assign reason.

Q.10: How can a saturated solution be made unsaturated ?

Q.11: Colloidal solutions show Tyndall effect but true solutions do not. Discuss.

Exam Questions NCERT Class 9 Science Chapter 2 Is Matter Around Us Pure

Question. What are two types of matter on the basis of composition?
Ans : Pure substance and mixture.

Question. What is the principle of separation?
Ans : The difference in physical or chemical properties of components of mixture is the basis of separation.

Question. Give chemical name of chalk and quicklime.
Ans : (i) Chalk : Calcium Carbonate
(ii) Quicklime : Calcium Oxide

Question. Milk of Magnesia is a-
Ans : True solution.

Question. Name of process used to separate liquids which have difference in boiling points of less than 25°C—
Ans : Fractional distillation.

Question. Name two metals which are highly malleable and ductile.
Ans : Gold and silver.

Question. Melting of wax is a physical change but burning of wax is a chemical change. Explain.
Ans : (i) Melting of wax changes the state of wax from solid to liquid. No new substance is formed. The chemical nature of solid wax and liquid wax is the same. Hence, melting of wax is a physical change.
(ii) Burning of wax gives new gaseous products. Both the physical and chemical changes are taking place. Hence, burning of wax is a chemical change.

Question. Name the process by which pure copper sulphate can be obtained from its impure sample.
Ans : Crystallization.

Question. Define the term heterogeneous.
Ans : A substance that does not have the same properties throughout the mixture is called heterogeneous.

Question. Define Chromatography.
Ans : The process of separation of different dissolved constituents of a mixture by absorbing them over an appropriate absorber is called, Chromatography.

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