Students learn what makes a mixture different from a pure substance and how to choose a separation method from the properties of its parts. The worksheet covers filtration, evaporation, distillation, magnetic separation, sieving and paper chromatography, then asks students to plan the separation of a three-part mixture and read a simple chromatogram.
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Curriculum: Texas grade levels (TEKS). We show specific outcome codes only where they have been verified against the official curriculum document.
Completed: Separating Mixtures: Filtration, Evaporation, Distillation and More
7th Grade students (typically ages 12–13) working on mixtures & chemical reactions. It is pitched at level 2 · standard.
Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.
About 35 minutes for 20 questions. Short, regular sessions work best: two or three a week beats one long one.
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Try Pure Substances and Mixtures: Elements, Compounds and Mixtures.
Success TutoringWorksheets7th Grade · Science · Mixtures & Chemical ReactionsName
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Choose a separation method by asking: how are these substances different? Think about particle size, whether each one dissolves, boiling point and magnetism.
Circle the best method for each separation.
A mixture contains two or more substances that are mixed together but not chemically joined. Because each substance keeps its own properties, we can separate them by physical methods that use a difference in those properties.
Filtration separates an insoluble solid from a liquid. The liquid that passes through the filter paper is the filtrate; the solid left on the paper is the residue.
Evaporation recovers a dissolved solid (the solute) from a solution by letting the liquid (the solvent) turn into a gas and escape. The solvent is not collected.
Distillation separates a liquid from a solution, or two liquids with different boiling points. The liquid is boiled, the vapor is cooled in a condenser, and the liquid collected is the distillate.
Magnetic separation pulls magnetic materials (such as iron, steel, nickel and cobalt) away from non-magnetic ones. Sieving separates solids with different particle sizes.
Paper chromatography separates dissolved substances, such as the dyes in an ink. A spot of ink is placed on a pencil line near the bottom of the paper, and a solvent soaks up the paper. Substances that are more soluble in the solvent travel further.
Safety: evaporation and distillation involve heating, so they are done in the school laboratory with your teacher.
Write T for true or F for false.
Preview — the PDF contains the full resource and answer sheet.
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