C1.2 Classification of Substances

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1. 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?

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

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

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

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

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

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7. Mention the characteristic of a temporary chemical change.

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8. Mention the characteristics of permanent chemical changes?

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

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

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

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

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

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

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

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

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

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

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19. 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?

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

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21. Mention the application of fractional distillation?

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

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

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24. Mention the characteristics of temporary physical changes?

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

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

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

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

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

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

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

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

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

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34. A pure substance can be classified into:-

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

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

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

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

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