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Comparing and Grouping
Comparing and Grouping
Everyday Materials
Everyday Materials
Materials can be grouped according to many different properties, including hardness, solubility, transparency, conductivity, response to magnets.
Materials can be grouped according to many different properties, including hardness, solubility, transparency, conductivity, response to magnets.
When we test these properties, we can present our data in different ways:
When we test these properties, we can present our data in different ways:
Tables
Tables
Venn Diagrams
Venn Diagrams
Surface
Surface
The top layer of something.
The top layer of something.
Drag
Drag
To cause an object to slow down.
To cause an object to slow down.
Centre
Centre
The middle of an object.
The middle of an object.
What is a reversible and irreversible change?
What is a reversible and irreversible change?
Watch the video on reversible and irreversible changes below:
Watch the video on reversible and irreversible changes below:
- A reversible change is a change that can be undone or reversed.
- A change is called irreversible if it cannot be changed back again. In an irreversible change, new materials are always formed. Sometimes these new materials are useful to us.
- When water is heated it evaporates into a gas called water vapour. This process is reversible as you can cool the gas down so it turns back into water. This is called condensation.
- Freezing and melting are reversible changes too along with dissolving.
- Cement mixed with water makes solid concentrate. This is a new material and therefore, is irreversible. It is not possible to get the water or concentrate separated again.
- Burning is also a irreversible change.
Below shows the different ways we reversible changes can be can be reversed:
Below shows the different ways we reversible changes can be can be reversed:
Everyday materials
Everyday materials
Think you know it all? Take the quiz!
Think you know it all? Take the quiz!
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