Success Homeschool

Year 7 Science · Separating mixtures

Name: ______________________

Date: ____________

1. Which technique separates sand from water?
- ☐ (a) Evaporation
- ☐ (b) Filtration
- ☐ (c) Chromatography
- ☐ (d) Magnetic separation
2. How is salt obtained from sea water in salt ponds?
- ☐ (a) Filtration
- ☐ (b) Decanting
- ☐ (c) Evaporation
- ☐ (d) Using a magnet
3. Which of these is a mixture?
- ☐ (a) Sea water
- ☐ (b) Distilled water
- ☐ (c) Pure gold
- ☐ (d) Oxygen gas
4. In filtration, what is the solid left in the filter paper called?
- ☐ (a) Filtrate
- ☐ (b) Solvent
- ☐ (c) Solution
- ☐ (d) Residue
5. Which technique would separate the dyes in a felt-tip ink?
- ☐ (a) Decanting
- ☐ (b) Paper chromatography
- ☐ (c) Magnetic separation
- ☐ (d) Filtration
6. What is the liquid that passes through a filter called?
7. Carefully pouring a liquid off a settled solid is called d________.
8. Can filtration remove dissolved salt from water? Answer yes or no.

Answer sheet

1. Filtration — Sand is insoluble, so filtering traps it while water passes through.
2. Evaporation — The Sun evaporates the water and leaves salt behind.
3. Sea water — Sea water contains water, salts and other dissolved substances.
4. Residue — The solid caught by the filter is the residue.
5. Paper chromatography — Chromatography separates dissolved dyes as they travel up paper.
6. filtrate — The liquid that passes through is the filtrate.
7. decanting — This technique is decanting.
8. no — Dissolved particles pass straight through filter paper; evaporation is needed.