5.2_Explaining Diffusion

The random movement and mixing of particles

• Diffusion

• Melting

• Evaporation

• Mixing

The speed of mixing by diffusion depends on three factors

• Temperature

• Size and mass of the particles

• The state of the substances that are diffusing

• The colour of the substances

True of False

Particles from warm food diffuse more quickly than those from cool food.

• True

• False

True of False

Diffusion happens quickly in a gas

• True

• False

Diffusion happens very slowly – in at all – in ..............

• Solid

• Liquid

• Gas

......................... used in making solar cells.

• Solid diffusion

• Liquid diffudsion

• Gas Diffusion

Explain why diffusion happens more quickly at higher temperatures.

• Warmer particles have more energy so they move faster.

• Warmer particles have less energy so they move faster.

• Warmer particles have more energy so they move slower.

• Warmer particles have less energy so they move slower.

Vana has flowers in her house. She can smell them all over the house.

This is because some sweet – smelling particles ____________________________ the flowers.

• move away from

• get closer to

• mixed with