Mixtures

28 Grade 5 Integrated Science questions on Mixtures, with worked marking schemes. 28 questions are available on this topic in full.

1. Question 1

   3 marks

   During harvest, farmers separate grains from chaff.

   (a) Name the method they use. (1 mark)

   (b) Explain how wind helps in this method. (2 marks)

   (3 marks)

   Marking scheme

   (a) Winnowing (1). (b) The mixture is tossed up into the air (1); the wind blows away the light chaff while the heavier grains fall straight back down (1).

2. Question 2

   1 mark

   Which of the following substances does NOT dissolve in water?

   A. Baking soda

   B. Sugar

   C. Sand

   D. Salt

   (1 mark)

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3. Question 3

   1 mark

   To obtain salt from a mixture of salt and water, the best method to use is ______.

   A. Winnowing

   B. Filtration

   C. Evaporation

   D. Decanting

   (1 mark)

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4. Question 4

   1 mark

   Sieving is used to separate mixtures based on

   A. weight

   B. colour

   C. magnetic properties

   D. particle size

   (1 mark)

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5. Question 5

   1 mark

   A mixture of sand and water is separated by allowing the sand to settle, then carefully pouring off the clear water. This method is called ______.

   A. Using a magnet

   B. Decanting

   C. Sieving

   D. Winnowing

   (1 mark)

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6. Question 6

   1 mark

   When salt is dissolved in water to form salty water, the salt is called the ______.

   A. Mixture

   B. Solute

   C. Solution

   D. Solvent

   (1 mark)

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7. Question 7

   3 marks

   Name three methods used to separate mixtures.

   (3 marks)

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8. Question 8

   1 mark

   Salt dissolved in water forms a

   A. solution

   B. suspension

   C. compound

   D. element

   (1 mark)

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9. Question 9

   1 mark

   In a mixture of sugar dissolved in water, water is the ______.

   A. Solute

   B. Solvent

   C. Gas

   D. Solid

   (1 mark)

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10. Question 10

    1 mark

    A substance that dissolves in water is said to be

    A. insoluble

    B. transparent

    C. magnetic

    D. soluble

    (1 mark)

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11. Question 11

    1 mark

    Which one of the following will dissolve in water?

    A. Small stones

    B. Sand

    C. Salt

    D. Cooking oil

    (1 mark)

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12. Question 12

    1 mark

    Which one of the following is a mixture?

    A. Pure water

    B. A piece of copper wire

    C. A single block of salt

    D. Sugar stirred into water

    (1 mark)

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13. Question 13

    2 marks

    State two reasons why it is important to be able to separate mixtures in daily life.

    (2 marks)

    Marking scheme

    Any two (1 mark each): to remove dirt/impurities from food; to clean water for drinking; to obtain useful substances such as salt; to sort out unwanted materials.

14. Question 14

    2 marks

    (a) What is a mixture? (1 mark)

    (b) Give one example of a mixture found in the home. (1 mark)

    (2 marks)

    Marking scheme

    (a) A mixture is two or more substances combined together without forming a new substance / that can be separated again (1). (b) Any correct example (1): salty water, tea with sugar, githeri (beans and maize), soil, fruit salad.

15. Question 15

    1 mark

    Kiptoo poured a mixture of cooking oil and water into a glass. The oil floated on top of the water. This shows that oil ______.

    A. Turns into water

    B. Does not mix (dissolve) with water

    C. Is heavier than water

    D. Dissolves in water

    (1 mark)

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16. Question 16

    1 mark

    Sand mixed with water can be separated by

    A. magnetism

    B. boiling

    C. evaporation

    D. filtration

    (1 mark)

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17. Question 17

    1 mark

    Which method is best for separating iron nails from a mixture of iron nails and sand?

    A. Evaporation

    B. Using a magnet

    C. Winnowing

    D. Hand picking

    (1 mark)

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18. Question 18

    1 mark

    Njeri wants to separate a mixture of maize grains and chaff using moving air (wind). The method she is using is called ______.

    A. Decanting

    B. Winnowing

    C. Filtration

    D. Sieving

    (1 mark)

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19. Question 19

    3 marks

    (a) Name the method used to separate iron filings from sand. (1 mark)

    (b) Explain why this method works. (2 marks)

    (3 marks)

    Marking scheme

    (a) Using a magnet (1). (b) A magnet attracts iron/magnetic materials (1) but does not attract sand, so the iron filings stick to the magnet while the sand is left behind (1).

20. Question 20

    1 mark

    When sugar is dissolved in water, the sugar is called the

    A. solution

    B. solute

    C. solvent

    D. mixture

    (1 mark)

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21. Question 21

    3 marks

    Explain the meaning of each of the following terms: (a) Solute (b) Solvent (c) Solution

    (3 marks)

    Marking scheme

    (a) Solute - the substance that dissolves, e.g. salt (1). (b) Solvent - the liquid in which the solute dissolves, e.g. water (1). (c) Solution - the mixture formed when a solute dissolves in a solvent, e.g. salty water (1).

22. Question 22

    1 mark

    A mixture is formed when ______.

    A. Water is heated until it turns into steam

    B. Two or more substances are combined without forming a new substance

    C. Salt breaks down into smaller pieces of salt

    D. One substance changes into a completely new substance

    (1 mark)

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23. Question 23

    1 mark

    Mama Ali removed small stones from maize flour by passing the flour through a wire mesh with tiny holes. This method is called ______.

    A. Hand picking

    B. Filtration

    C. Sieving

    D. Winnowing

    (1 mark)

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24. Question 24

    1 mark

    A mixture is formed when two or more substances are

    A. heated to very high temperatures

    B. chemically bonded together

    C. combined without a chemical reaction

    D. frozen together

    (1 mark)

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25. Question 25

    1 mark

    Which mixture can best be separated by hand picking (sorting)?

    A. Iron filings and sand

    B. Stones and dry beans

    C. Chaff and grains

    D. Salt and water

    (1 mark)

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26. Question 26

    2 marks

    Wambui made a mixture of stones and dry beans.

    (a) Name a suitable method to separate them. (1 mark)

    (b) Give a reason for your answer. (1 mark)

    (2 marks)

    Marking scheme

    (a) Hand picking/sorting (1). (b) The stones and beans are big enough to be seen and picked out, and they differ in size and appearance (1).

27. Question 27

    3 marks

    (a) Name the method used to get salt from salty water. (1 mark)

    (b) Describe how this method is carried out. (2 marks)

    (3 marks)

    Marking scheme

    (a) Evaporation (1). (b) The salty water is heated (1); the water evaporates (turns to water vapour) and escapes, leaving the salt behind (1).

28. Question 28

    1 mark

    Iron filings can be separated from a mixture with sand using a

    A. spoon

    B. filter paper

    C. sieve

    D. magnet

    (1 mark)

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