Diffusion is the net movement of particles of a substance down a concentration gradient.

Net movement is the overall movement of particles from one area to another.

A material is permeable if particles of a liquid are able to move through it.

In a science experiment, a variable is a factor that can be changed, kept the same, or measured.

A scientific prediction is a testable statement about a possible outcome of an experiment

Diffusion through a permeable material: practical

Science

Diffusion: moving particles

Diffusion through the cell membrane

Diffusion through a selectively-permeable membrane: practical

Pupils will learn about absorption of small molecules from food in the digestive system.

Pupils learned about muscles and that they have roles in organ systems.

This unit explores diffusion's role in material movement in and between cells and involves making predictions, observations and measurements with various methods.

Diffusion

Particles of liquid can move through a material if it is {{}}.

Particles of liquid can move into a cube of jelly by the process of ...

In which beaker have particles of acid diffused all the way to the centre of the jelly cube?

Jelly cubes are placed in acid at three different temperatures, and the time taken for the acid to decolourise each cube is recorded. Match the types of variables to the factors.

At lower temperatures, the time taken to decolourise the cube will be longer.

At lower temperatures, the time taken to decolourise the cube will be shorter.

Temperature will have no effect on the time taken to decolourise the cubes.

Which scientific prediction is most likely to be correct?

The taken will be the same for each of the cubes.

Jelly cubes of three different widths are placed in acid. Which cube will be completely decolourised by the acid in the shortest time?

Aisha: "Only liquids are made up of particles."

Izzy: "Only gasses are made up of particles."

Lucas: "Only liquids and gasses are made up of particles."

Sam: "Solids, liquids and gasses are made up of particles."

The particles that make up a liquid are ...

different concentrations of particles in one area and another

the overall movement of particles from one area to another

the net movement of particles down a concentration gradient

Match each scientific term to its correct definition.

There is a higher concentration in area A than area B.

There is a higher concentration in area B than area A.

The concentration is the same in area A and area B.

In which direction will there be net movement of particles?

In which direction will particles move along the concentration gradient?

Diffusion through a permeable material: practical

Lesson outcome