C1.2 Classification of Substances

1. A saturated solution is one in which no more solute can dissolve at a given temperature. True or False?

2. The constant temperature at which a pure liquid boils is called?

3. Which of the following statements is CORRECT ABOUT ELEMENTS?

4. In a solid-liquid mixture , when a solid dissolves in a liquid it said to be?

5. Mention the characteristic of a temporary chemical change.

6. What is the effect of impurities on the melting point of a substance?

7. The fixed temperature at which a solid changes into a liquid is called?

8. The solid particle that is left on the filter paper during filtration is known as?

9. Mention the characteristics of permanent chemical changes?

10. During a temporary chemical change of hydrated copper (ii) sulphate into anhydrous copper (ii) sulphate + water, the process is accompanied by heat energy evolved?

11. When a mixture of sand and water is allowed to stand , the sand settles at the bottom and the water is poured off carefully to leave the sand behind. This method is known as?

12. A pure substance can be classified into:-

13. Mention the 2 ways to determine the purity of substances?

14. The process of obtaining crystals from saturated solutions is known as?

15. The solid which is formed directly when a vapor cools is known as?

16. The process of grouping together substances with similar properties is called classification?

17. Mention the application of fractional distillation?

18. The liquid which flows through the filter paper during filtration is known as?

19. The method of separation of colored substance due to their difference of absorption on the filter paper is known as?

20. How can a solvent be obtained from a solution? {Solid-liquid}

21. The smallest particle of an element or compound which can exist separately is known as?

22. The method of separation which uses a filter paper and the solid particles are left on the filter paper and the liquid flows through the filter is known as?

23. A temporary physical change of solid wax to liquid wax is usually accompanied by a net heat change. Yes or No?

24. How can oil be extracted from nuts and seeds?

25. How can a mixture of sand and sodium chloride be separated?

26. What is the effect of impurities on the boiling point of a substance?

27. The smallest particle of an element that can take part in a chemical change is known as?

28. Explain the effect of heat on liquids according to the kinetic theory of matter?

29. Explain the effect of heat on solids according to the kinetic theory of matter?

30. Which of the following is not a type of a mixture of substances?

31. Why is Dry ice preferred over ordinary ice with ice-cream vendors?

32. Fractional distillation is used to separate miscible liquids that have different but close boiling points. True or False?

33. The process where a substance changes from solid to vapor directly or vapor to solid without forming the liquid is known as?

34. Mention the characteristics of temporary physical changes?

35. A pure substance made up of 2 or more elements chemically combined is called?

36. How can sodium chloride be obtained from a mixture of sodium chloride and water?

37. Solution = solute (solid)+ solvent (liquid). True or False?

38. In a solid-liquid mixture, the solid which doesn’t dissolve in the liquid is said to be?