What is diffusion?
The moving and mixing of particles from one place to another.
Why does diffusion happen fastest in gases?
Because gas particles are far apart and move freely.
What happened when food colouring was added to water?
The coloured particles spread out between the water particles by diffusion.
What does the movement of food colouring in water show?
That particles are always moving and can mix without stirring.
What did you observe in the Skittles and water experiment?
The colour from the Skittles dissolved and diffused into the water.
What is meant by ‘the colour dissolved’ in the Skittles experiment?
The dye particles left the Skittle and spread out into the water.
What was the aim of the diffusion in solids experiment?
To observe diffusion through a solid using gelatine and food colouring.
What was observed during the diffusion in solids experiment?
The coloured dye slowly spread through the gel, showing diffusion in solids is slow.
What conclusion was drawn from the diffusion experiments?
Diffusion is slowest in solids, fastest in gases, and in between in liquids.
What is chromatography used for?
To separate substances, such as the colours in inks or dyes.
