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Choose the right technique to separate a mixture

6th grade (Year 7 in England) · 11 questions · Common Core: NGSS.MS-PS1-2 · England: KS3 Chemistry: Pure and impure substances

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Date

Score/ 11

1
Question 1
Which technique is best to separate sand from water?
- A. fractional distillation
- B. evaporation or crystallisation
- C. chromatography
- D. filtration
2
Question 2
A mixture contains iron filings and sulfur powder. What is the quickest way to separate them?
- A. use chromatography
- B. filter them
- C. distil them
- D. use a magnet
3
Question 3
Which technique is best to separate the fractions in crude oil?
- A. filtration
- B. simple distillation
- C. evaporation or crystallisation
- D. fractional distillation
4
Question 4
Countries such as Saudi Arabia get much of their drinking water from the sea. Which method is used on a large scale?
- A. desalination by distillation or reverse osmosis
- B. adding more salt
- C. filtration through sand only
- D. chromatography
5
Question 5
Which technique is best to separate pure water from sea water?
- A. filtration
- B. evaporation or crystallisation
- C. simple distillation
- D. fractional distillation
6
Question 6
Countries such as Saudi Arabia get much of their drinking water from the sea. Which method is used on a large scale?
- A. adding more salt
- B. filtration through sand only
- C. desalination by distillation or reverse osmosis
- D. chromatography
7
Question 7
Which technique is best to separate the dyes in black ink?
- A. fractional distillation
- B. evaporation or crystallisation
- C. chromatography
- D. simple distillation
8
Question 8
Countries such as Saudi Arabia get much of their drinking water from the sea. Which method is used on a large scale?
- A. filtration through sand only
- B. chromatography
- C. desalination by distillation or reverse osmosis
- D. adding more salt
9
Question 9
Which technique is best to separate pure water from sea water?
- A. simple distillation
- B. chromatography
- C. fractional distillation
- D. filtration
10
Question 10
Why is the filtrate clear after filtering muddy water?
- A. The filter paper adds chemicals
- B. Water evaporates
- C. The solid particles are too big to pass through the filter paper
- D. The mud dissolves
11
Question 11
Which technique is best to separate food colourings in a sweet coating?
- A. simple distillation
- B. chromatography
- C. filtration
- D. evaporation or crystallisation

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Answer key: Choose the right technique to separate a mixture

1. D. filtration
2. D. use a magnet
3. D. fractional distillation
4. A. desalination by distillation or reverse osmosis
5. C. simple distillation
6. C. desalination by distillation or reverse osmosis
7. C. chromatography
8. C. desalination by distillation or reverse osmosis
9. A. simple distillation
10. C. The solid particles are too big to pass through the filter paper
11. B. chromatography