Question

Is Matter around Us Pure
1. Write main components of (i) solution (ii) colloids.
2. Identify solute & solvent in the following:
(i) aqueous solution of sugar (ii) tincture of iodine (iii) aerated drinks.
3. What is meant by the term solution? Give two examples of solutions.
4. Differentiate between the following:
a) Miscible and immiscible liquids. b) Aqueous and non-aqueous solutions.
c) Saturated and un-saturated solutions d) Sol, gel, and emulsion.
e) Foam and aerosol. f) Solid foam and solid sol.
5. How is heating of sugar and heating of ammonium chloride different from each other? Explain.
6. What are supersaturated solutions? How can they be prepared?
7. (i)What is the effect of cooling on a saturated solution?
(ii)What happens when a saturated solution is further heated?
8. Define the word solubility. On what factors does the solubility depend?
9. Give 2 examples of each (i) true solution (ii) suspensions (iii) colloids
10. (i) Define concentration of a solution. Give its expression.
ii) How many litres of 15 % sugar solution would it take to get 75 g of sugar?
11. (i)What factor decides whether the solution is saturated or unsaturated?
(ii)Why is it difficult to see the particles of solute and solvent in a true solution whereas they can be seen easily in a suspension?
12. What are colloids? What is observed when a beam of strong light is passed through a colloidal solution?
13. Differentiate between mixtures and compounds. (5 points)
14. What is meant by the dispersed phase and he dispersion medium?
15. What are the applications of evaporating process? Give its principle
16. Define crystallization. What type of mixture is separated by the technique of crystallization?
17. What is the principle of centrifugation technique? Which kind of mixtures can be separated by using this technique? Give its applications.
18. Name the technique used for separating a mixture of two immiscible liquids. What is the principle behind this technique? Where does this technique find application?
19. (i)What is meant by the term chromatography? When this technique is used?
(ii) how does this technique work?
20. (i)How will you separate a mixture of ammonium chloride and sand?
(ii)Name the steps involved in the separation of iodine, iron filings, and salt from a mixture.

Answer 1

Answer:

1. solution

2.2

3. I don't know

4.b