Particles on the move

23 March 2023
3.7 Particles on the move
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Slide 1: Slide
PhysicsSecondary EducationAge 12,13

This lesson contains 20 slides, with interactive quizzes and text slides.

Items in this lesson

23 March 2023
3.7 Particles on the move

Slide 1 - Slide

Content objectives
  • describe diffusion in terms of particle theory
  • explain how diffusion happens in gases
  • explain how diffusion happens in liquids
  • explain that the speed of diffusion is affected by the change in concentration
  • explain that the speed of diffusion is affected by the change in temperature

Slide 2 - Slide

Let's recall

Slide 3 - Slide

Key Question 1
How would you know if someone is cooking food in your kitchen without really going to the kitchen?

Slide 4 - Slide

Slide 5 - Slide

Slide 6 - Slide

Key Question 2
When you pour orange juice into the water, why does all the liquid eventually turn orange?

Slide 7 - Slide

Slide 8 - Link


A gas particle moves randomly.
I agree.
I disagree.

Slide 9 - Poll


The speed and direction of particles are constant (not changing).
I agree.
I disagree.

Slide 10 - Poll


What happens when you mix two gases in one container?

Slide 11 - Open question


Which of the following terms is used to describe what happens to the particles of both gases mixed in one container?
A
disappear
B
doubled in number
C
spread out

Slide 12 - Quiz

Slide 13 - Slide

What term is used to describe the overall random movement of particles from an area of high concentration to a lower concentration of particles?

Slide 14 - Slide

Slide 15 - Link

Slide 16 - Slide

Key Question 3
What happens when you heat up the particles of a liquid?

Slide 17 - Slide

Slide 18 - Link


What happens when you heat up the particles of a liquid?

Slide 19 - Open question

Lesson Summary
  • Diffusion happens when particles of gases and liquids move randomly from a higher concentration to a lower concentration.
  • When two gases are mixed in a container, the particles of each gas spread out randomly in the container over a period of time.
  • The bigger the difference in concentration, the faster the diffusion of gases or liquids.
  • The higher the temperature, the faster the diffusion because the particles have more energy to move.

Slide 20 - Slide