C1.2 Classification of Substances

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

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

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

4. Mention the characteristic of a temporary chemical change.

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

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

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

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

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

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

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

12. 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?

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

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

15. 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?

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

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

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

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

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

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

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

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

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

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

26. Mention the application of fractional distillation?

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

28. A pure substance can be classified into:-

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

30. Mention the characteristics of temporary physical changes?

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

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

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

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

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

36. Mention the characteristics of permanent chemical changes?

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

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