A solute is a substance that has dissolved into a solvent.

A solvent is a substance into which a solute dissolves.

When a solute dissolves, it is described as soluble.

When a solute and solvent combine, a solution forms.

The combined mass of starting materials equals the combined mass of the end products.

Mixtures and solutions

Science

Pure substances

Mixtures: choosing equipment

Mixtures: equipment diagrams

Diffusion

Dissolving

Variables

Dissolving: scientific methods

Solubility: practical

Solubility: analysis

Saturated solutions

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

Select the two units used to measure mass.

Sugar will dissolve in tea. Sugar is {{}} in tea.

If salt is dissolved in water. How would you describe the solution formed?

a liquid in which a substance can dissolve

formed when a substance dissolves in a liquid

unable to dissolve in a particular liquid

If 52.3 g of copper sulfate, a soluble substance, is added to some water and the final mass of the solution is 97.6 g, what was the mass of water?

A cross is drawn on two white tiles using marker pen. The pen's ink is soluble in acetone and insoluble in water. What will you see if the left is wiped with acetone and the right is wiped with water?

Which picture shows an insoluble substance?

Sugar dissolves in water, so sugar can be described as a {{}} solid.

A {{}} is a material formed from two or more substances which can be physically separated.

I'm think that might be a liquid mixture.

I'm fairly certain this shows an impure solid.

Some students have been asked to describe this diagram using key terms.  Who has used their key words correctly?

Melting is what happens when a substance disappears.

Melting occurs when solid particles become more regularly arranged.

Melting is the process of a substance disappearing in a liquid.

Melting occurs when solid particles become more irregularly arranged.

Melting is a reversible, physical change.  Which of the following statements is also true about melting?

Mixtures and solutions

Lesson outcome