Question

14. Classify the following into metals, non-metals and metalloids:

Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon,

Magnesium, Copper, Boron, Helium

15. Draw a flow chart for the schematic representation of different types of matter.

16. Out of a colloid, solution and a suspension:

(a) Which one has the smallest particles?

(b) Which one has the largest particles?

17. Calculate the concentration of solution which contains 2.5 g salt dissolved in 50 g

water.

18. A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the

concentration of this solution.

19. What happens when the temperature of a saturated sugar solution is increased?

20. Which of the two will scatter light: soap solution or sugar solution ? Why?

21. Define (a) solute, and (b) solvent

22. What is the difference between solutions and colloids?

23. What is the difference between colloids and suspensions?

24. Classify the following into true solutions and colloidal solutions:

Ink, Salt solution, Starch, Blood, Sugar Solution

25. Explain what happens when a beam of light is passed through a colloidal solution.

26. Which of the following will show Tyndall Effect and why?

(a) Salt solution (b) Starch solution (c) Milk (d) Copper sulphate solution

27. Classify the following as physical or chemical changes:

(i) Cooking of food (ii) Boiling of water (iii) Cutting of trees

(iv) Dissolving salt in water (v) Digestion of food (vi) Melting of ice

28. Name the process by which the various gases of the air are separated.

29. Name any two solid substances whose mixture can be separated by sublimation.

30. How will you separate a mixture of chalk powder and water?

31. Name the process which can be used to recover salt from an aqueous salt solution.

32. Name the process you would use to separate ammonium chloride from a mixture of

sodium chloride and ammonium chloride.

33. Name the process which is used in milk dairies to separate cream from milk.

34. Name the process you would use to separate a mixture of water and alcohol.



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Answer 1

Answer:

14 answer

Metals :

mercury,sodium, magnesium, copper,

Non- metals :

diamond,sulphur,carbon,boron,helium,iodine

Metalliods:

Germanium,iodine