Diffusion lesson

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