Filtration, Distillation, Decantation & more — Primary and Secondary
Distinguish homogeneous from heterogeneous mixtures and learn which separation method to use in each case. From sieving flour to distilling alcohol, the exam covers all methods from the official curriculum with real examples.
Almost everything around us is a mixture, not a pure substance, so knowing which separation method to use in each case isn't abstract theory — it's the logic behind making coffee, purifying water or manufacturing any industrial product.
The exam covers the six basic separation methods with their key example —filtration, distillation, decantation, magnetism, sieving, evaporation— and at Secondary level adds chromatography and crystallisation, always with application questions: which method would you use and why.
Revise mixtures and separation methods with real examples in the exam below.
Physics & Chemistry · Primary, Secondary
Each separation method is presented with a real-life example: coffee (filtration), sea salt (evaporation), wine (distillation). Theory makes sense when you see what it is for.
Primary covers types of mixture and basic methods. Secondary adds chromatography, crystallisation and the difference between distillation and evaporation.
It is not just memorising names. The exam asks which method you would use to separate sand from water, or how sea salt is obtained. Applied reasoning.
"A Year 8 student understands why a drip coffee maker is filtration and why oil floats on water when they see the decantation question."
Tricks and techniques to master this topic faster:
Learn the 6 basic methods with their key example: filtration=coffee, distillation=alcohol, decantation=oil+water, magnetism=iron+sand, sieving=flour, evaporation=sea salt.
To distinguish homogeneous/heterogeneous: can you see the components with the naked eye? Heterogeneous. No? Homogeneous.
Remember that distillation COLLECTS the condensed vapour — that is what distinguishes it from simple evaporation.
For Secondary: chromatography separates by speed of movement, not by size or density.
If you are studying Mixtures & Separation Methods, these curriculum topics complement each other:
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