Year 7 Diffusion

Diffusion is the movement of cells from a ​ (a)   concentration to a ​ (b)   concentration

• high
• low

Which ones are examples of diffusion?

• Tea bag in hot water

• Spraying perfume or air freshener

• Breathing and taking in oxygen

• Adding juice to water

What is happening here?

Label this correctly

b

a

Low concentration

High concentration

Particles diffuse because they are ​ (a)   . They ​ (b)   around ​ (c)   , so they mix with the other particles.

• moving
• staying still
• vibrate
• dissappear
• move
• randomly
• don't move
• vanish
• appear
• in a straight line

Diffusion will always happen at the same speed.

• True

• False

What factors affect the speed of diffusion

• Smell

• Temperature

• Particle size

• State of substance

At ​ (a)   temperatures, particles are moving more quickly. Particles that are higher in temperature will travel ​ (b)   distance than particles that are lower in temperature.

• higher
• lower
• more
• less

What particles diffuse quicker?

• Bigger, heavier particles

• Smaller, lighter particles

Diffusion can happen in solids

• True

• False