Class 9 - Chemistry
Is Matter Around Us Pure?
What are the two types of pure substances ? Give one example of each type.
Questions and Answers
Is Matter Around Us Pure? - Questions
1. What are the kinds of mixture?
2. State the differences between compounds and mixtures.
3. What are the properties of a colloid?
4. What do you mean by strength of the solution?
5. What is meant by a pure substance?
6. Based on the amount of solute in the given solution, how solutions are classified?
7. What is an unsaturated solution?
8. What is supersaturated solution?
9. Based on the type of solvent, how solutions are classified?
10. What are suspensions? Explain with an example.
11. Explain with an example what is a colloid?
12. What are the physical states of dispersed phase and dispersion medium of a cloud?
13. What are the physical states of dispersed phase and dispersion medium of a fog?
14. How are sol, solution and suspension different from each other?
15. Describe sieving method.
16. Winnowing works on what property?
17. How many elements are there which are in gaseous state at room temperature?
18. Name the elements are in liquid state at room temperature.
19. Who used the term 'element' first time?
20. Give examples of liquids that are
(i) completely miscible
(ii) partially miscible
(iii) practically immiscible
21. How elements are further classified?
22. What are non-aqueous solutions?
23. What are the advantages of preparing solutions?
24. What are the properties of suspensions?
What are the various methods to express concentration of a solution?
26. What are the reasons for separating the constituents of a mixture?
27. How crystallization is better than evaporation?
28. What is Chromatography?
29. A good method to separate alum (phitkari) from impure samples is
30. 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.
(h) Iron pins from sand.
(i) Wheat grains from husk.
(j) Fine mud particles suspended in water.
31. Who gave the first explanatory definition of 'element'?
32. Why solutions do not exhibit Tyndall effect?
33. On the basis of composition, how matter is classified?
34. What are the characteristics of mixture?
35. What is a solution? What are the properties of a solution?
36. Identify solute and solvent in the following solutions. Also mention the physical state of solute and solvent.
(a) Sugar in water
(b) Urea in water
(c) Ammonium chloride in water
(d) Ethyl alcohol in water
(e) Carbon Di-Oxide in water (soda water)
37. What are aqueous solutions?
38. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293K. Find its concentration at this temperature.
What are different ways to separate solid mixtures?
(a) When it is useful to apply sedimentation and decantation?
(b) Give an example where these methods are used?
(c) Explain the process.
41. Define Brownian movement in colloids.
42. Name the following :
(a) a lustrous liquid metal.
(b) a liquid non-metal
(c) a metal which can be cut with a knife
(d) a non-metal which is good conductor of electricity.
(e) an element which melts when kept on the palm.
(f) the best conductor of heat.
43. In beaker A, sugar cubes are dissolved into water while in beaker B, crushed cubes are taken. In which beaker the rate of dissolution is faster?
44. What are different categories of pure substance?
45. List the points of differences between homogeneous and heterogeneous mixtures.
46. Why do fish go in deep waters during day light?
47. (a) What is Tyndall effect? Doe true solution exhibit Tyndall effect.
(b) ‘‘Tyndall effect can be observed when sunlight passes through the canopy of dense forest. or we see a rich red sunset.’’ "Explain how this occurs.
48. A solution contains 40 mL of ethyl alcohol mixed with 100mL of water. What is the concentration of the solution in terms of volume by volume percentage?
49. What is an emulsion? Give examples
50. What are the differences and similarities between concentration and solubility?
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