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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 salt dissolved in water?
- A. sieving
- B. using a magnet
- C. filtering
- D. evaporating
2
Question 2
Why can't filtering separate salt from salt water?
- A. Salt is magnetic.
- B. Dissolved salt particles are small enough to pass through the filter paper.
- C. Filter paper dissolves in salt water.
- D. The salt is too heavy.
3
Question 3
What is the best way to separate pebbles and sand?
- A. letting it settle, then pouring off the top layer
- B. using a magnet
- C. evaporating
- D. sieving
4
Question 4
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
5
Question 5
What is the best way to separate oil floating on water?
- A. filtering
- B. sieving
- C. using a magnet
- D. letting it settle, then pouring off the top layer
6
Question 6
In some dry countries, drinking water is made from seawater. Which process gets fresh water out?
- A. using a magnet
- B. evaporating the water and condensing it again (distillation)
- C. freezing the salt out with a fan
- D. sieving the sea
7
Question 7
What is the best way to separate pebbles and sand?
- A. using a magnet
- B. letting it settle, then pouring off the top layer
- C. sieving
- D. filtering
8
Question 8
Why do recycling plants use magnets and air jets to sort rubbish?
- A. To make the rubbish cleaner.
- B. They separate materials using their different properties, such as magnetism and weight.
- C. To melt the plastics.
- D. To make the rubbish heavier.
9
Question 9
What is the best way to separate iron filings and sand?
- A. sieving
- B. evaporating
- C. letting it settle, then pouring off the top layer
- D. using a magnet
10
Question 10
Why does a sieve separate pebbles from sand but not salt from water?
- A. Water is too heavy for a sieve.
- B. A sieve separates by size; dissolved salt particles are far too small to catch.
- C. Salt is magnetic.
- D. Pebbles dissolve in the sieve.
11
Question 11
What is the best way to separate pebbles and sand?
- A. letting it settle, then pouring off the top layer
- B. filtering
- C. evaporating
- D. sieving

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Answer key: Choose the best way to separate a mixture

1. D. evaporating
2. B. Dissolved salt particles are small enough to pass through the filter paper.
3. D. sieving
4. A. evaporating the water and condensing it again (distillation)
5. D. letting it settle, then pouring off the top layer
6. B. evaporating the water and condensing it again (distillation)
7. C. sieving
8. B. They separate materials using their different properties, such as magnetism and weight.
9. D. using a magnet
10. B. A sieve separates by size; dissolved salt particles are far too small to catch.
11. D. sieving