The cards Question What is filtration? Tap to flip Answer Separating an insoluble substance from a liquid using a filter. Question In filtration, what is the residue? Tap to flip Answer The insoluble solid left in the filter paper. Question In filtration, what is the filtrate? Tap to flip Answer The liquid that passes through the filter paper. Question Are dissolved substances caught by filter paper? Tap to flip Answer No, they are smaller than the pores in the paper, so they pass through with the liquid. Question Give one example of a material that a magnet attracts. Tap to flip Answer e.g. iron or steel. Question What is crystallisation? Tap to flip Answer Forming solid crystals from a saturated solution by evaporating the solvent. Question What is a crystal? Tap to flip Answer A solid whose particles are arranged in a highly ordered, repeating pattern. Question What can evaporating solvent from a solution produce? Tap to flip Answer A saturated solution. Question How does the speed of evaporation affect crystal size? Tap to flip Answer Slower evaporation of the solvent forms larger crystals. Question What effect does heating a solution have on its solvent? Tap to flip Answer The solvent evaporates more quickly. Question How does evaporation differ from boiling? Tap to flip Answer Evaporation happens only at the surface of the liquid, and the gas mixes with air. Question What is a separation technique? Tap to flip Answer A process used to isolate a substance from a mixture, usually to get a pure sample of it. Question What helps decide the best technique to separate a mixture? Tap to flip Answer The properties of the substances in it. Question Which three steps separate salt from rock salt? Tap to flip Answer Making a solution, filtration, then crystallisation. Question What are immiscible liquids? Tap to flip Answer Liquids that are not soluble in each other. Question What are miscible liquids? Tap to flip Answer Liquids that dissolve in each other. Question What happens when immiscible liquids are left to settle? Tap to flip Answer They do not mix: one floats above the other. Question Do miscible liquids separate into layers if left? Tap to flip Answer No. Question What is decanting? Tap to flip Answer Pouring off the top layer of a mixture of immiscible liquids, or of a liquid and an insoluble solid. Question Give one way to separate immiscible liquids. Tap to flip Answer e.g. decanting or using a separating funnel. Question What property of liquids can be used to separate miscible liquids? Tap to flip Answer Their boiling points. Question What is density? Tap to flip Answer Mass per unit volume. Question What is distillation? Tap to flip Answer A separation technique that uses boiling and condensation to remove and isolate a liquid part of a mixture. Question What is condensation? Tap to flip Answer A substance in the gas state being cooled and changing to the liquid state. Question What is the distillate? Tap to flip Answer The liquid condensed from the gas state during distillation. Question What is a condenser? Tap to flip Answer Apparatus made of a tube surrounded by a cold layer, usually cold water. Question Why should a condenser be kept cold? Tap to flip Answer To speed up condensation. Question Why does distillation work? Tap to flip Answer One part of the solution has a different boiling point from the other part. Question What kind of mixture is simple distillation used to separate? Tap to flip Answer A mixture containing only two substances. Question When is fractional distillation used? Tap to flip Answer For mixtures of three or more substances, or of substances with similar boiling points. Question What happens if the condenser warms up during distillation? Tap to flip Answer It becomes less effective and more gas escapes. Question Does heating strongly for a long time improve distillation? Tap to flip Answer No, heating must be carefully controlled so only one substance is in the condenser at a time. Question What is chromatography? Tap to flip Answer A technique that separates a mixture into its different parts so the results can be analysed. Question What is a chromatogram? Tap to flip Answer The pattern left on the stationary phase after chromatography. Question How many spots does a pure substance produce on a chromatogram? Tap to flip Answer One. Question How can chromatograms help identify an unknown component of a sample? Tap to flip Answer By comparing chromatograms. Question Is pencil soluble or insoluble in water? Tap to flip Answer Insoluble. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Science Unit Separation techniques England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Science lesson by Oak National Academy licensed under Open Government Licence (OGL)
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