1 Mark Questions:
1. What is meant by pure substance?
2. What is meant by mass percentage of solution?
3. Name the process of separation of miscible liquids.
4. Arrange the following in decreasing order of size of the particles.
True Solution, Suspension, Colloid.
5. "Glve an example of an aqueous solution in which gas is dissolved.
6. Name the dispersion medium and dispersed phase in the white material inside an egg.
7. What happens when hot saturated solution is cooled?
8. How would you separate a mixture of chalk and water?
9. How much water should be added to 15 grams of salt to obtain 15 % salt solution?
10. What type of mixtures are separated by technique of crystallization ?
Answers
Answer:
1 ) A substance that has a fixed chemical composition throughout is called pure substance
Answer:
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Explanation:
1. A substance that has a fixed chemical composition throughout is called a pure substance.
2. Mass percentage of a solution is a method to express the concentration or the amount of a component present in a given quantity of solution.
3. The process of separation of miscible liquids is known as "DISTILLATION".
4. Suspension > Colloid > Solution.
5. Example:- A solution of table salt or sodium chloride (NaCl), in water would be represented as Na+(aq) + Cl−(aq).
6. Dispersed phase is yolk and dispersion medium is albumin.
7. If a saturated solution is cooled below a temperature at which the solution is prepared, then it will lead to a decrease in solubility of the solute. Again, if this solution is heated, the crystals would dissolve in the solution and no longer be visible.
8. Chalk is insoluble in water and forms a heterogeneous mixture when mixed with water. As chalk is heavier, therefore it will settle at the bottom of the mixture when it is left undisturbed for sometime. Thus, water can be separated from chalk powder by sedimentation, decantation and filtration.
9. Concentration of solution = 15%
Mass of solute = 15g
Mass of solvent = 15 + X
From formula,
Concentration of solution = (Mass of solute / Mass of solution) X 100
15 = (15/15+X) x 100
15 + X = (15/15) x 100
X = 100 - 15
X = 85 g
∴ 85 g of water should be added to 15 grams of salt to obtain 15 % salt solution.
10. Homogeneous mixtures such as common salt solution and copper sulphate solution separated by technique of crystallization.
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