Recap previous learning
ParticlesSolids, Liquids and Gases
Miss Cason to go through the fill in the gaps answers
Mr Pickett asks selected students for their answers for the problem solving question.
Level 6 Model AnswerUsing key words and good English
• Gas particles would be more likely to spread
(diffuse) in to the air quicker as they have no
bond and move around freely at speed. In
comparison liquid particles still move around
freely, but not at speed and they do have a
bond.
Diffusion
Remember the 2 particles where diffusion can take place.List one practical example of each type of diffusion.
Describe the processes that occur during diffusion.Explain how these differ between gas and liquid diffusion.
Analyse liquid diffusion in different environments.
Lesson ObjectiveInvestigate different types of diffusion, understanding the processes that take place during liquid and gas diffusion.
4
5
6
WALT – We are learning to
Diffusion
Key WordsDiffusionParticles
BondsLiquidsSolidsGases
Diffusion
Video
3 6
Explain the difference between gas and liquid diffusionUsing key terms
Explain about diffusion but not using key words.
List examples and facts of both gas and liquid diffusion
NC Levels
Expectationsafter video
TRUE OR FALSE
SHOW YOUR GREEN CARD FOR TRUE
SHOW YOUR RED CARD FOR FALSE
Diffusion occurs in the form of liquid and gas, but not in solids.
TRUE OR FALSE
TRUE
Gas diffusion happens quickly because gas particles move quickly and have no bond.
TRUE OR FALSE
TRUE
Liquid diffusion occurs at a slower rate than gas diffusion.
TRUE OR FALSE
TRUE
Diffusion can occur in solids, such as wood and plastics.
TRUE OR FALSE
FALSE
The mixing and spreading of particles in gases and liquids is called diffusion.
TRUE OR FALSE
TRUE
Gas particles move very slowly.
TRUE OR FALSE
FALSE
Smells spread by diffusion of the smelly gas particles.
TRUE OR FALSE
TRUE
Questions after the video
Diffusion
How much can we remember about diffusion?
Collaborative task
DIFFUSION
Level 4 - List some examples or facts about diffusion.
Level 5 – Describe the processes that take place during diffusion.
Level 6 – Explain and compare liquid and gas diffusion. 1
Merit each for the best group
Diffusion
Liquid Diffusion Demonstration
Mr Stevens will demonstrate liquid diffusion with potassium manganate.
During this task you must watch carefully, listen and be ready for some questions by
Mr Stevens.Try to answer using key words.
Class Experiment
Students are to diffuse a tea bag in hot and cold water in order to see which one
diffuses the fastest.
Title: Diffusion of a tea bag in different environments
Results table
BeakerDescription of the
colour of the water after 3 minutes
Temperature (C)(as the tea bag first
touches the water).
Hot water
Cold water
Diffusion
Method Roles
The diagram below shows how the experiment will be set up. P1 – Places a white piece of paper under the
beaker with a cross on it.
P2 – Pour cold water in to a beaker that contains a tea bag.
P3 – Timer (time 3 minutes) and inform the group when time is up.
P4 – Records the data.
P5 – Records the temperature of the water at the start of the experiment.
Beaker of hotOr cold water
Tea bag
Thermometer Stop clock
X Paper with a ‘X’
Diffusion
Safety
• Stand up when carrying out the
experiment.
• Make sure bags are under tables.
• Be extra careful with hot water.
Equipment List
• 2 beakers containing
• 2 tea bags
• Stop watch
• Thermometer
DiffusionThoughts during experiment
Think about what you will write in your conclusionWhat are the reasons for one diffusing quicker than the other?
Method RolesThe diagram below shows how the experiment will be set up. P1 – Places a white piece of paper under the
beaker with a cross on it.
P2 – Pour cold water in to a beaker that contains a tea bag.
P3 – Timer (time 3 minutes) and inform the group when time is up.
P4 – Records the data.
P5 – Records the temperature of the water at the start of the experiment.
Beaker of hotOr cold water
Tea bag
Thermometer Stop clock
X Paper with a ‘X’
Diffusion
Exam style questions
Based on end of year KS3 test
Q1. Diffusion can not occur in which particle (please circle) (1 mark)a. Liquidsb. Solidsc. Gases
Q2. Which is the correct definition for diffusion (1 mark):d.Diffusion is the movement of particles from a high concentration to a low concentration.b. Diffusion is the movement of particles from a low concentration to high concentration.c. Diffusion is the movement of water molecules from an area of high concentration to an area of low concentration.
Q3.Explain the processes of liquid and gas diffusion including the speed at which it occurs? (4 marks)
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Diffusion
Remember the 2 particles where diffusion can take place.List one practical example of each type of diffusion.
Describe the processes that occur during diffusion.Explain how these differ between gas and liquid diffusion.
Analyse liquid diffusion in different environments.
Lesson ObjectiveInvestigate different types of diffusion, understanding the processes that take place during liquid and gas diffusion.
4
5
6
WALT – We are learning to
Diffusion
Plenary
2 things that students have learnt in the lesson about diffusion
1 thing that they need to read up on, on the topic of diffusion.
Diffusion
Tell Mr Stevens 1 fact that you have learnt from today’s lesson as you leave
the class room
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