Separation techniques Quiz
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5 questions, one answer each
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1. Which method separates sand from a mixture of sand and water?
- A. Filtration
- B. Simple distillation
- C. Fractional distillation
- D. Crystallisation
2. Which method is used to obtain pure water from seawater?
- A. Filtration
- B. Fractional distillation
- C. Simple distillation
- D. Decanting
3. Why does the lower boiling point liquid reach the top of a fractionating column first?
- A. It is denser
- B. Its vapour does not condense in the column
- C. It dissolves the other liquid
- D. It is magnetic
4. Why is a solution left to cool during crystallisation?
- A. Solubility falls so crystals form
- B. The water must be cooled before it can evaporate
- C. Cooling makes the solid dissolve
- D. Cooling removes the filtrate
5. 10.0 g of a mixture gives 9.2 g of separated substances. What is the percentage recovered?
- A. 8%
- B. 92%
- C. 108%
- D. 98%