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Choose the best way to separate a mixture

5th grade (Year 6 in England) · 11 questions · Common Core: NGSS.5-PS1-3 · England: KS2 Y5 Properties and changes of materials

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  1. Question 1

    What is the best way to separate oil floating on water?

    • A. using a magnet
    • B. filtering
    • C. letting it settle, then pouring off the top layer
    • D. evaporating

  2. Question 2

    In some dry countries, drinking water is made from seawater. Which process gets fresh water out?

    • A. freezing the salt out with a fan
    • B. using a magnet
    • C. sieving the sea
    • D. evaporating the water and condensing it again (distillation)

  3. Question 3

    What is the best way to separate salt dissolved in water?

    • A. evaporating
    • B. filtering
    • C. using a magnet
    • D. sieving

  4. Question 4

    In some dry countries, drinking water is made from seawater. Which process gets fresh water out?

    • A. using a magnet
    • B. sieving the sea
    • C. evaporating the water and condensing it again (distillation)
    • D. freezing the salt out with a fan

  5. Question 5

    What is the best way to separate iron filings and sand?

    • A. using a magnet
    • B. sieving
    • C. letting it settle, then pouring off the top layer
    • D. filtering

  6. Question 6

    In some dry countries, drinking water is made from seawater. Which process gets fresh water out?

    • A. evaporating the water and condensing it again (distillation)
    • B. sieving the sea
    • C. using a magnet
    • D. freezing the salt out with a fan

  7. Question 7

    What is the best way to separate iron filings and sand?

    • A. sieving
    • B. using a magnet
    • C. letting it settle, then pouring off the top layer
    • D. evaporating

  8. Question 8

    Why does a sieve separate pebbles from sand but not salt from water?

    • A. Salt is magnetic.
    • B. A sieve separates by size; dissolved salt particles are far too small to catch.
    • C. Pebbles dissolve in the sieve.
    • D. Water is too heavy for a sieve.

  9. Question 9

    What is the best way to separate salt dissolved in water?

    • A. evaporating
    • B. filtering
    • C. sieving
    • D. using a magnet

  10. Question 10

    Why can't filtering separate salt from salt water?

    • A. Salt is magnetic.
    • B. Filter paper dissolves in salt water.
    • C. Dissolved salt particles are small enough to pass through the filter paper.
    • D. The salt is too heavy.

  11. Question 11

    What is the best way to separate oil floating on water?

    • A. filtering
    • B. evaporating
    • C. using a magnet
    • D. letting it settle, then pouring off the top layer

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  1. letting it settle, then pouring off the top layer
  2. evaporating the water and condensing it again (distillation)
  3. evaporating
  4. evaporating the water and condensing it again (distillation)
  5. using a magnet
  6. evaporating the water and condensing it again (distillation)
  7. using a magnet
  8. A sieve separates by size; dissolved salt particles are far too small to catch.
  9. evaporating
  10. Dissolved salt particles are small enough to pass through the filter paper.
  11. letting it settle, then pouring off the top layer