Diffusion

IGCSE Chemistry 0620
Topic 2 States of Matter
11 September 2023
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Slide 1: Slide
ChemistrySecondary EducationAge 12,13

This lesson contains 28 slides, with interactive quizzes, text slides and 1 video.

Items in this lesson

IGCSE Chemistry 0620
Topic 2 States of Matter
11 September 2023

Slide 1 - Slide


Describe how you feel right now 
using an emoji.
😒🙁😐🙂😃

Slide 2 - Poll

  • explain changes of state in terms of kinetic particle theory, including the interpretation of heating and cooling curves  
  • describe and explain diffusion in terms of kinetic particle theory  
  • describe and explain the effect of relative molecular mass on the rate of diffusion of gases  
I intend to:
11 September 2023, Monday

Slide 3 - Slide

IGCSE Chemistry 0620
Topic 2 States of Matter
11 September 2023

Slide 4 - Slide

  • 🜛 Present the cooling curve made (two groups only).
  • 🜛 Processing and feedback
Retrieval Activity
11 September 2023, Monday
timer
5:00

Slide 5 - Slide

11 September 2023, Monday
Interpretation
  • Sloped lines: temperature of the state of matter is increasing.
  • Horizontal lines: change of state (no change of temperature)
  • This is a HEATING CURVE.
Processing

Slide 6 - Slide

11 September 2023, Monday
Interpretation
  • Sloped lines: decrease in temperature
  • Horizontal lines: change of state (no change of temperature)
  • This is a COOLING CURVE.
Processing

Slide 7 - Slide

11 September 2023, Monday
Interpretation
  • What is happening at B and D?
  • What states are A and C?
  • Explain using the KPT.
Processing

Slide 8 - Slide

IGCSE Chemistry 0620
Topic 2 States of Matter
11 September 2023

Slide 9 - Slide

  • What happens to the colourless hot water when you put a tea bag in it?
A question that matters! 
11 September 2023, Monday

Slide 10 - Slide

Key Concept
11 September 2023, Monday
  • Diffusion—  a process by which different gases or different liquids mix and is due to the random motion of their particles

Slide 11 - Slide

IGCSE Chemistry 0620
Topic 2a States of Matter
06 September 2023

Slide 12 - Slide

Investigation 01
KMnO4 in a petri dish of water
timer
5:00
11 September 2023, Monday

Slide 13 - Slide

  • Discuss how and why diffusion happened in this case
Processing
11 September 2023, Monday
OBSERVATIONS after 5 minutes
Diffusing particles
Movement of diffusing particles
The concentration of diffusing particles after 5 minutes
Why is energy NOT required?

Slide 14 - Slide

Investigation 02
 Diffusion of tea
timer
5:00
11 September 2023, Monday

Slide 15 - Slide

  • Discuss how the diffusion of tea happened 
Processing
11 September 2023, Monday
OBSERVATIONS after 5 minutes
Diagram showing diffusion every one minute.
Description of the water 
(colour change)

Slide 16 - Slide

Compare/contrast observations with the KMnO4 and tea diffusion

  • Rate of diffusion
  • Movement of diffusing particles
Processing
11 September 2023, Monday

Slide 17 - Slide

Investigation 03
 Diffusion of gases
timer
5:00
11 September 2023, Monday
DO: Note down significant points related to diffusion in your notebook.

Slide 18 - Slide

Slide 19 - Video

🜛 SHARE: Give at least three points you noted 
Processing
11 September 2023, Monday

Slide 20 - Slide

  • faster diffusion in gases than in liquids
  • at the same temperature = different gases do not diffuse at the same rate (speed) WHY?
  • Lighter (lower relative mass) gas particles = travel faster and farther
Processing
11 September 2023, Monday

Slide 21 - Slide

  • faster diffusion in gases than in liquids
  • at the same temperature = different gases do not diffuse at the same rate (speed) WHY?
  • Lighter (lower relative mass) gas particles = travel faster and farther
Processing
11 September 2023, Monday
  • NH3 molecules have less mass than the HCl molecule, so diffuse faster, hence the product (a white smoke of NH4Cl) forms closer to the end where the HCl is.

Slide 22 - Slide

IGCSE Chemistry 0620
Topic 2 States of Matter
11 September 2023

Slide 23 - Slide

Classwork 5 
Diffusion
timer
12:00
06 September 2023, Monday

Slide 24 - Slide

IGCSE Chemistry 0620
Topic 2 States of Matter
11 September 2023

Slide 25 - Slide

Topic Assessment 1
States of Matter
timer
40:00
11 September 2023, Monday

Slide 26 - Slide

Self-Assessment for Learning
11 September 2023, Monday
T O  D O:
  • Identify two ideas you do not understand quite well in our sessions.
  • Ask someone who can explain and write the explanations in your notebook.
  • Verify your learning from a classmate by sharing it with the teacher.
timer
5:00
Week 06 Reflection 1:

Slide 27 - Slide


Why does a car tire explode 
when the temperature increases?

Slide 28 - Open question