The process in which a substance's particles separate and spread uniformly throughout the particles of a solvent, resulting in the substance no longer being seen.

Solubility refers to how well a solute is able to dissolve in a solvent to create a solution.

A variable is anything that can change in an investigation.

A result that does not fit an obvious trend.

Solubility: practical

Science

Pure substances

Mixtures: choosing equipment

Mixtures: equipment diagrams

Mixtures and solutions

Diffusion

Dissolving

Variables

Dissolving: scientific methods

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

Physical activity and equipment requiring safe use

In any investigation, the factor that is changed by the scientist is called the {{}} variable.

Stop the timer when the solute is fully dissolved (no longer visible).

Put the steps in the correct order for investigating how temperature affects speed of dissolving (starting with adding the solvent to the beaker):

Process where solute particles spread throughout solvent. 

How well a solute is able to dissolve in a solvent.

Something that does not fit an obvious trend.

Anything that can change in an investigation.

To increase the temperature of the solvent.

To help the solute dissolve more uniformly.

What is the purpose of stirring a solution in a solubility experiment?

If the size of the solute pieces is decreased in a solubility experiment, the solute will dissolve...

When a solute completely dissolves in a solvent, the resulting mixture is called a...

The random motion of particles in a fluid.

The movement of particles in a pure substance.

Match the measurement unit to what it measures:

A combination of substances with fixed boiling points.

A combination of two or more substances that can be physically separated.

The term for a solid that dissolves in a solvent to form a solution is called a...

The mass of solute and solvent equals the mass of the solution.

The mass of the solution is always more than its components.

The mass of the solution changes with temperature.

What does the conservation of mass mean in the context of making a solution?

When an insoluble solid is added to a liquid, a common observation is that the substance {{}} to the bottom of the container over time.

Solubility: practical

Lesson outcome

Content guidance