1Aht Nutrition Phase transitions

• Natuurkunde / Scheikunde
• Middelbare school
• havo, vwo
• Leerjaar 2

What do you remember about the phases of matter?

Do you think a phase can change into another phase?

1. Yes
2. No

Phase changes

Learning objectives

I can name the six phase changes that substances can undergo

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

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

Phase transitions 

As we know, weather can change suddenly

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

Phase transitions 

There are six phase transitions 

We will walk through these transitions with examples and pictures

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

Melting solid->liquid

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

Evaporation liquid->gas

Over time, when it is warm enough, water can turn into invisable water vapour

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

Deposition gas->solid

When the temperature drops below 0 degree Celsius, water vapour turns into solid ice

What changes in a phase transition?

1. Nothing changes
2. The distance between the molecules
3. How hard the molecules vibrate
4. The composition of the atoms in the molecules

A substance can change from solid to liquid. This is called a phase transition.
What is the name of this phase transition?

1. freezing
2. evaporation
3. melting
4. deposition

Do particles change shape or size during a phase change?

1. Yes
2. No

Do molecules change during phase transition?

1. Yes
2. No

How can a substance change from the solid to the liquid phase?

1. a decreasing temperature
2. an increasing temperature
3. by shaking
4. not possible