If a solid or gas dissolves in a liquid, it mixes so completely with the liquid that it cannot be seen.

Solids and gases that dissolve in a liquid are soluble.

A solution is a mixture of a liquid with a dissolved solid or gas.

To separate something, you put different parts of it into different groups.

To evaporate is to change from a liquid to a gas.

Separating soluble solids from solutions

Science

In this Properties, changes and separating materials unit, pupils learn to decide how mixtures might be separated, including through filtering, sieving and evaporating. In the Materials challenge unit, they will build on this knowledge to apply their understanding of separating materials to a wider range of everyday situations

In the Everyday materials unit, pupils learnt to compare and group together a variety of everyday materials on the basis of their simple physical properties. In this Properties, changes and separating materials, pupils will build on this knowledge to compare an group together everyday materials on the basis of a wider variety of properties

This unit explores the properties of everyday materials, including hardness, solubility, and conductivity. It covers reversible changes like dissolving and mixing, and irreversible changes such as burning. Emphasis is on scientific enquiries, data recording, and presenting findings with evidence.

Properties, changes and separating materials

Physical activity and equipment requiring safe use

A solid that dissolves in a liquid is {{}}. 

A solid dissolved in a liquid forms a __________.  

Which of these methods cannot be used to recover soluble solids from a solution? 

Match the type of solid to the method which can be used to recover it from a liquid.  

Water is evaporating from the clothes on the washing line. Evaporation is when … 

the solid that was dissolved in the liquid

When the liquid part of a solution evaporates, what is left behind? 

What method is often used to separate an insoluble solid from a liquid?

At a temperature below 0°C, water is in a _________ state. 

What is the name of the process when a liquid turns into a solid?

What is the name of the process when a gas turns into a liquid? 

Which of these materials is soluble in water? 

Content guidance

Risk assessment required - equipment

Adult supervision required

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Content guidance

Supervision

Worksheet