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Particles on the move
23 March 2023
3.7 Particles on the move
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Slide 1:
Slide
Physics
Secondary Education
Age 12,13
This lesson contains
20 slides
, with
interactive quizzes
and
text slides
.
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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
phet.colorado.edu
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
phet.colorado.edu
Slide 15 - Link
Slide 16 - Slide
Key Question 3
What happens when you
heat up
the particles of a liquid?
Slide 17 - Slide
phet.colorado.edu
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
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