C2- Material Choices OCR 21st century

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What are materials made up from?
Chemicals.
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What is meant by synthetic?
It is made by humans.
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What is an advantage of synthetic material?
You can control its properties.
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What is meant by natural?
Material that directly comes from other living things.
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What is a melting point?
The temperature that a solid material becomes a liquid.
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What is meant by strength?
How good a material resists a force and how much force is required to break it.
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What is meant by stiffness?
If the material is good at bending or not.
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What is meant by hardness?
How difficult a material is to cut into.
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What is meant by density?
A materials mass per unit volume.
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What atoms does crude oil contain?
Hydrogen and carbon.
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What is a hydrocarbon?
Molecules that are made from only hydrogen and carbon atoms.
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What does crude oil have?
A mixture of hydrocarbons.
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How is crude oil separated?
Through fractional distillation.
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What materials are at the top of the crude oil fractions?
Refinery gas, peterol.
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What is the difference between the top and bottom fractions?
The length, the boiling points.
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What is a polymer?
Man-made materials.
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What is polymerisation?
Loads of small molecules linked together.
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How are plastics formed?
When small molecules called monomers join together.
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What are the properties of a polymer with weak forces?
It is free to slide over each other, they can strech easily and have a low melting point.
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What are the properties of a polymer with strong forces?
They have high melting points, can't be easily stretched and have crosslinks holding chains firmly together.
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What is the nanoparticle range?
1-100nm
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What are the dangers of nanoparticles?
They may lurch into human tissue causing health issues.
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Why are the health effects on nanoparticles unknown?
It is a new technology.
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Other cards in this set

Card 2

Front

What is meant by synthetic?

Back

It is made by humans.

Card 3

Front

What is an advantage of synthetic material?

Back

Preview of the front of card 3

Card 4

Front

What is meant by natural?

Back

Preview of the front of card 4

Card 5

Front

What is a melting point?

Back

Preview of the front of card 5
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