What is the process called when particles move randomly and mix with each other?

• Evaporation

• Diffusion

• Condensation

• Precipitation

At room temperature, particles in liquid water move at an average speed of ____.

• 100 km/h

• 1600 km/h

• 444 m/s

• 2000 km/h

Which factor does NOT affect the speed of diffusion?

• Temperature

• Particle size

• Color of particles

• State of the diffusing substance.

Why do substances diffuse?

• Because they are stationary

• Because they are moving

• Because they are solid

• Because they are liquid.

Fill in the blank: At higher temperatures, particles are moving more ____.

• Slowly

• Quickly

• Randomly

• Predictably

What is the term used to describe the movement of perfume particles in the air?

• Convection

• Diffusion

• Radiation

• Conduction

Fill in the blank: Diffusion does not always happen at the same ____.

• Temperature

• Speed

• Pressure

• Volume

Describe the different diffusion speeds through substances in the solid, liquid, and gas states.

• Fastest in solids

• Fastest in liquids

• Fastest in gases