3.3 Phase changes

Chapter 3.3 Phase changes
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Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 21 slides, with text slides.

time-iconLesson duration is: 45 min

Items in this lesson

Chapter 3.3 Phase changes

Slide 1 - Slide

Schedule for this lesson
Explanation about the new paragraph

Making question in the workbook/on your laptop

Discussing questions

Recapping

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Learning objectives
You can name the six phase changes that substances can undergo

You can describe how the phase transitions of water play a key role in all kinds of weather phenomena

You can use the particle model to explain why temperature plays a key role in melting and evaporation



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Last time we talked about...
Temperature

How are we able to measure the temperature?

And do we remember which unit(s) we use for temperature?

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Phase transitions 
As we know, weather can change suddenly

A day can start sunny, but end up with a thunderstorm

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Phase transitions 
And so do substances!

When water freezes or melts it is known as a phase transition 

A substance transitions depending on the temperature





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Phase transitions 
There are six phase transitions 
We will walk through these transitions with examples and pictures


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Freezing/solidification liquid->solid
When water freezes it turns into ice

The term solidifying is also used, but for things that turn solid at temperatures above 0 degrees Celsius like candle wax

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Melting solid->liquid
When the temperature rises, the solid ice will turn into a liquid again

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Evaporation liquid->gas
Over time, when it is warm enough, water can turn into invisable water vapour

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Condensation gas->liquid
But when warm air cools down and meets a cold object, water vapour condenses out and turns water vapour into visable water

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Deposition gas->solid
When the temperature drops below 0 degree Celsius, water vapour turns into solid ice

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Sublimation solid->gas
Snow will slowely get thinner, this is because ice turns into water vapour when the air is cold and dry

But there are substances that can turn from a solid to a gas a lot faster

Both processes are called sublimation
https://www.youtube.com/watch?v=8Gj8dr6AsYg

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Phase transitions in the particle model
We are going to look at the particle model again. This time we will look at how to movement of the molecules change depending on the temperature.

https://phet.colorado.edu/sims/html/states-of-matter-basics/latest/states-of-matter-basics_en.html

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Making questions 3.3
Make the following questions: 1, 2, 3, 4, 6, 7, 8, 9 and 10


Done? take a look at the extra questions

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Discussing questions 3.3
Question 1

  • Condensation
  • Evaporation
  • Deposition
  • Sublimation
  • Condensation

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Discussing questions 3.3
Question 2

  • They are similar because the phase transitions from liquid to solid

  • They are different because freezing happens at 0 degree Celsius or lower, while solidifying could happen at higher temperatures

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Discussing questions 3.3
Question 6

  • The temperature indoors in higher than outdoors

  • The water droplets are water vapour turning into a liquid because of the temperature change (coming from the air outside)

  • Condensation

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What did we learn today?
In today's lesson we talked about the different phase transitions 


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What did we learn today?
And how temperature changes the way the molecules move in the particle model


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End of the lesson

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