Lesson 4: 3.3 Phase Change

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Cette leçon contient 24 diapositives, avec quiz interactifs, diapositives de texte et 2 vidéos.

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Slide 1 - Diapositive

Plan for today
1. Testing your knowledge
2. Phase changes/transitions
3. Working on the exercises


Slide 2 - Diapositive

Which one of these is NOT
a phase?
A
Water
B
Gas
C
Liquid
D
Solid

Slide 3 - Quiz

True or false:
Water vapour is invisible.
A
True
B
False

Slide 4 - Quiz

True or false:
A thermometer works because
ethanol shrinks as the temperature increases
A
True
B
False

Slide 5 - Quiz

If we are heating up a block of ice, from what temperature will it start to melt?
A
-10 °C
B
0 °C
C
10 °C
D
1 °C

Slide 6 - Quiz

In which phase has molecules the less freedom of movement?
A
Gas phase
B
Solid phase
C
Liquid phase

Slide 7 - Quiz

What is the name for the attractive force between molecules of same substance?
A
adhesion
B
cohesion

Slide 8 - Quiz

In the image you can see a representation of the particle model of a certain substance.
At what stage is this substance?

A
The gas phase
B
The solid phase
C
The liquid phase

Slide 9 - Quiz

In the image you can see a representation of the particle model of a certain substance.
At what stage is this substance?

A
The solid phase
B
The liquid phase
C
The gas phase

Slide 10 - Quiz

Learning objectives
1. You can name the 6 phase changes.

2. You can describe the phase changes in the particle model.

3. You can name and recognize real-life examples of the phase changes

Slide 11 - Diapositive

Phase transitions

Slide 12 - Diapositive

Slide 13 - Vidéo

Slide 14 - Vidéo

Temperature and movement
The higher the temperature the faster the particles move. 
If they move faste enough then they can escape. 
Below, you can see this happening when water starts evaporating.

Slide 15 - Diapositive

Boiling
The process by which evaporation occurs anywhere in the liquid.

Slide 16 - Diapositive

Water is special
Water is smallest at 4 degrees Celsius. 
This is due to its crystal structure. 

Slide 17 - Diapositive

Crystal structure of water

Slide 18 - Diapositive

Which phase transition you see in the picture?
A
Evaporation
B
Melting
C
Condensation
D
Freezing / Solidification

Slide 19 - Quiz

Fog occurs when a lot of water droplets are suspended in the air. After a clear day, fog suddenly appears
What can you say about the temperature?
A
It has turned colder
B
The temperature has stayed the same
C
It has turned warmer

Slide 20 - Quiz

Water expands when it is heated
Why?
A
The distances between the molecules become greater
B
More water molecules are being added
C
the distances between the molecules become smaller

Slide 21 - Quiz

Which phase transition belongs to this sentence:
The rice is cooked completely dry.
A
Evaporation
B
Melting
C
Condensation
D
Freezing / solidification

Slide 22 - Quiz

7) Match correct descriptions with each phase transition.
from gas to liquid
from solid to liquid
from solid to gas
from liquid to solid
from liquid to gas
from gas to solid
solidification
melting
evaporation
condensation
deposition
sublimation

Slide 23 - Question de remorquage

Homework
Chapter 3 section 3
Assignments: 1 till 7 

Slide 24 - Diapositive