Page 143 - Knowledge Organiser Yr8 24-25

Knowledge Base: Science 8.8 Materials Year 8
3. Alloys, Ceramics and Polymers
3.10
State four examples of naturally occurring polymers
Wool, cotton, rubber, silk
3.11
Naturally occurring polymers are biodegradable. What does this mean?
The ability for a material to be broken down naturally by the organisms in an ecosystem, therefore avoiding pollution
5. Recycling resources
5.1
If a resource is finite, what does this mean?
There is a limited supply and it could eventually run out
5.2
How can we make finite resources last longer?
Reuse or recycle them
5.3 What does recycling mean? Processing materials so that they can be used again
5.4
Give three examples of materials that can be recycled
Paper, some plastics, aluminium
5.5
Give two examples of reusing materials
Reusing plastic bags (bags for life), buying second hand items
5.6
Which is preferable and why: recycling or reusing?
Reusing as it uses less energy
5.7
Give two advantages of recycling
1. Uses less energy than making new items
2. Less polluting than extracting raw materials from the earth to make new items
5.8
Give two disadvantages of recycling
1. Can be expensive and energy intensive 2. Not all items can be recycled
5.8
What is the most effective way to save resources?
Reduce the number of new things we buy (reduce consumption)
4. Synthetic Polymers and Composites
4.1
What is a synthetic polymer?
A polymer that is developed and made in a laboratory
4.2
Name an example of a synthetic polymer
Plastics
4.3
Name three uses of plastic polymers
Plastic bags, packaging, waterproof clothing
4.4
What is a composite?
A mixture of materials which combines the properties of the materials it is made up of
4.5
Are composites synthetic or natural?
Synthetic
4.6 State three examples of composites Concrete, raincoats, carbon fibre
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