Occurs when a substance's particles separate and spread throughout the particles of a solvent resulting in it no longer being seen.

If a substance does not dissolve in a particular solvent, it is described as insoluble.

Melting occurs when a substance in the solid state is heated and its particles move into the arrangement of a substance in the liquid state.

A force of attraction is a pulling force that keeps things, such as particles, close together.

A mixture of an insoluble solid and liquid in which the solid particles are dispersed in the liquid and settle upon the mixture standing.

Dissolving

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.

Solutions

Physical activity and equipment requiring safe use

Solid particles are visible and can settle.

It changes state over a range of temperatures.

Why is a suspension not considered a solution?

Overcoming forces of attraction between solvent particles.

Dissolving is not the same as melting, but both are {{}} processes.

Why is it incorrect to say that every substance can be dissolved in a solvent?

Solute-solvent forces of attraction are weaker than solute-solute.

The solute particles are larger than the solvent particles.

Solute-solvent forces of attraction are stronger than solute-solute.

The solute particles do not collide with the solvent particles.

During the dissolving process, why does a solute dissolve in a solvent?

Particles fit into spaces between each other.

Some solvent is spilled when forming the mixture.

Why might the total volume of a mixture be less than the sum of the volumes of its individual components?

It has particles that are visible to the naked eye.

It is made of two or more substances mixed evenly at the particle level.

It separates into layers when left standing.

Which of the following statements is true of a solution?

Arrange the following states of substances based on their increasing ability to flow, starting with the state that cannot flow.

{{}} is the ability of a substance to dissolve in a solvent. 

A substance into which a solute dissolves.

A substance that has dissolved into a solvent.

When a solute and solvent combine, this is formed.

When a solute dissolves, it is described as this.

What happens to the total mass of substances that are mixed together?

What is the term for the random motion of particles suspended in a medium?

Content guidance

Risk assessment required - equipment

Adult supervision required

This lesson will be removed by end of Summer Term 2025.

Dissolving

Lesson outcome

Content guidance

This lesson will be removed by end of Summer Term 2025.