A passive process doesn’t require any additional energy.

Concentration is the number of particles in a volume of liquid or gas.

A concentration gradient is a difference in the concentration of particles from one area to another.

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

Diffusion is the net movement of a substance from an area of higher concentration to an area of lower concentration.

Diffusion: moving particles

Science

Diffusion through a permeable material: practical

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

Physical activity and equipment requiring safe use

What can particles in a liquid and gas do that enables them to diffuse? 

Stop moving when they are evenly spread out

Which of the following describe the movement of particles in liquids and gases?

Movement of particles from an area of lower to higher concentration.

Movement of particles from an area of higher to lower concentration.

Movement of particles from one concentration to another. 

Requires particles to be in the gas state.

Requires particles to be in the liquid state

Which of the following are examples of particles that may be found in the cell cytoplasm?

The number of particles in a volume of liquid or gas.

The overall movement of particles from one area to another.

Which of the following are **not** made of cells?

Which one statement about the human body is true?

Starting with the largest, put these in size order.

close, randomly arranged and can move around each other.

far apart, randomly arranged and free to move.

Match the particles with their correct arrangement. 

Describes the arrangement of particles in solids, liquid and gases.

Describes the arrangement of cell organelles within cells.

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