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Lesson

Solutions and Separation

Choose separation methods using solubility, particle size, settling, and magnetic attraction.

30min lesson

Objectives3 goals Lesson6 blocks Review11 assets Practice38 items

Learning objectives

What to understand

3 goals

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Identify solute, solvent, and solution in familiar examples.
Choose a separation method and explain why it works.
Explain the limits of filtration and evaporation.

Lesson

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6 sections

Concept

Key idea

A solution forms when a solute dissolves in a solvent. In salt water, salt is the solute and water is the solvent. The dissolved salt is spread through the water even though we cannot see the individual particles. Filtration separates an insoluble solid, such as sand, from a liquid. The filter traps sand; water and dissolved substances can pass through. Ordinary filter paper does not remove dissolved salt. Filtered water is not automatically safe to drink. Evaporation changes a liquid into a gas. If water evaporates from a salt solution, salt remains. Evaporation happens without boiling too. To collect the water rather than lose it to the air, its vapour must be cooled and condensed in suitable equipment. Sieving separates solid particles by size. Sedimentation lets suspended solid particles settle in a liquid. Decantation means carefully pouring off the upper liquid. A magnet separates iron from a non-magnetic material such as sand.

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6 lesson sections6 cards / 5 notes19 MCQs / 19 written questions

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In this chapter

Matter, Materials, and Mixtures

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Solutions and Separation

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Matter, Materials, and Mixtures

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Solutions and Separation

What to understand

Step-by-step lesson

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Worked example

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Matter, Materials, and Mixtures

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