A pure substance contains only one type of chemical

A mixture is a material that contains two or more different substances which can be physically separated

An impurity is a chemical that is found in a material in very small amounts, but can change the material's properties

Pure substances

Science

In the Separation Techniques unit, pupils will build on their knowledge of solutions to learn about methods for separating mixtures, including filtration, evaporation, distillation, and chromatography.

In the Solid, Liquid and Gas States and Changes of State unit, pupils learned to categorise substances into the solid, liquid or gas state and explored particle behaviour during changes of state.

This unit explores the concepts of pure substances, mixtures, and diffusion in liquids and gases. It emphasises accuracy, precision, and the use of appropriate techniques during investigations. The focus is on making predictions and recording reliable observations.

Solutions

Physical activity and equipment requiring safe use

A {{}} material is composed of only one type of chemical.

Which of the following is an example of a pure substance?

What is the name given to a substance found in a material in very small amounts, but which can alter the material's properties?

Complete this sentence: A significant feature of a mixture is that it...

Which diagram correctly represents a mixture in the solid state?

Mixtures boil at a single, specific temperature.

Mixtures contain only three types of chemicals.

Mixtures boil over a range of temperatures.

Mixtures must contain at least two types of chemicals.

Which of these statements about mixtures are true?

The three states of matter are: solid, {{}}, and gas.

Which of the following are examples of materials in the solid state at room temperature?

Match the state of matter with the correct particle diagram.

The temperature at which a liquid turns into a gas.

The temperature at which a liquid turns into a solid.

The temperature at which a gas turns into a liquid.

The temperature at which a solid turns into a liquid.

Which description correctly describes a substance's melting point?

particles only vibrate in fixed positions

What properties would you expect of a material with this particle arrangement?

Content guidance

Risk assessment required - chemicals

Risk assessment required - equipment

Adult supervision required

Starter Quiz