A variable is anything that can change or be changed in an investigation.

The independent variable is the variable that is changed during an investigation.

The dependent variable is the variable that is measured or observed during an investigation; it changes as a result of varying the independent variable.

A control variable is a variable that is kept the same or constant to ensure a fair test.

When only one variable is changed to affect the dependent variable; all other variables are controlled

Variables

Science

Pure substances

Mixtures: choosing equipment

Mixtures: equipment diagrams

Mixtures and solutions

Diffusion

Dissolving

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

Physical activity and equipment requiring safe use

Which definition best fits a 'control variable'?

What type of variable responds to the changes made?

Link the term to its role in an experiment.

True or False: A dependent variable can be deliberately changed by the experimenter.

If the investigation is fair, changing the {{}} variable should be the only variable that is allowed to change.

Identify variables that could affect the outcome.

Choose one independent variable to change.

Keep all other variables the same throughout (these are the control variables).

Observe and measure the changes to the dependent variable.

Record the results of the dependent variable.

Arrange these statements to describe setting up a fair test, starting with identifying any variables that may affect the experiment's outcome.

What does 'to measure' mean in a science experiment?

True or False: Changing many things you're testing at once during your experiment makes a good experiment.

Which of the following are things you can use to observe what happens in an experiment?

Match each action with its correct experimental term.

The test is done under the same conditions each time.

When we talk about a 'fair test' in science, what do we mean?

When conducting an experiment, the step that involves making an educated guess about the outcome is called a {{}}.

Starter Quiz

What does 'to measure' mean in a science experiment?