2ND TERM CHEMISTRY EXAMINATION JSS2

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Welcome to your 2ND TERM CHEMISTRY EXAMINATION JSS2

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1. The burning of materials in the presence of air is called

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2. All physical changes are

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3. The method of separation used in refining crude oil is known as

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4. The coating of zinc on iron

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5. Which of the following is a disadvantage of evaporation

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6. Oil and water may be separated by using

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7. This is a simple method of separating an insoluble solid from a liquid

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8. Which of the following would you use to separate sand from iron fillings

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9. Water and alcohol are easily separated by distillation because of their

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10. Liquids that do not mix are said to be

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11. Which of the following substances is a mixture

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12. Two or more substance mingled together but not chemically combined are known as a

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13. Which of the following methods is used to separate the colors in food days

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14. Sieving is used

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15. Salt is obtained from sea water by drying it in the sun. The process is known as

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16. Peanuts are separated from a mixture of peanuts and corn by

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17. The technique that separates a liquid from an insoluble solid by carefully pouring off the liquid is called

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18. Air is regarded as a mixture because

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19. In which of the following are the constituents present in any ratio

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20. Purity of a solid substance can be checked by its

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1. ........ is the name given to the liquid collected after filtration

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2. ......... is used to separate soluble solid from a liquid.

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3. The holes in a sieve is called..........

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4. ..........and 5. ......... are used to test for acidic and alkaline substances

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6. To separate coloured dyes we use...........

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7. .............and 8............... make up a solution

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9. ........and 10. ............ are types of chromatography

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THEORY ANSWER ALL

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1a. Differentiate between a compound and a mixture 1b. State 4 examples of a mixture

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2. List 5 apparatus found in chemistry laboratory and their uses.

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3a. Describe the process of Simple distillation method. 3b. Draw the simple distillation set-up

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4. Explain the following; i. Solution ii. Evaporation III. Fractional distillation IV. Decantation

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