IS MATTER PURE AROUND US

IS MATTER PURE AROUND US

Class 9

1.	What is distillation?	1
2.	How is blood a heterogeneous substance?	1
3.	Acetone evaporates in normal room temp. Why do we have to heat it to its boiling point?	1
4.	How would you separate a mixture of NH4Cl and I2?	1
5.	If salt is added to water, is the mixture homogeneous or heterogeneous. Give reasons for your	1
6.	What mass of A would be required to produce its saturated solution in 50 grams of water at 313 K?	1
	why Tyndall  effect is not seen in  a solution?	1
7.	How cans a saturated solution made unsaturated?	2
8.	Calculate the mass of sodium sulphate required to prepare its 20% ( mass percent ) solution in 100g of water?	2
9.	A solution is prepared by dissolving 15 g of sodium chloride in 200g of water. what is mass by mass percentage of salt in this solution	2
10.	How to separate components from mixture containing sulphur, charcol , pottasium nitrate?	2
11.	Action of heat on blue vitriol is a physical as well as chemical change. Justify.	2
12.	Explain the following giving examples: (a) Saturated solution, (b) Pure substance, (c) Colloid, (e) Suspension.	4
13.	Which separation techniques will 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. (h) Iron pins from sand. (i) Wheat grains from husk. (j) Fine mud particles suspended in water.(k)mixture of camphor,common salt and sand	12