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21 Cards in this Set
- Front
- Back
What is a melting point? |
The point when a substance turns from solid to liquid |
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What is strength ( 2 types ) |
Ability to resist a force • tensile - ability to resist a pulling force • compressive - ability to resist a pushing force |
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What is stiffness? |
Ability to bend easily |
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What is hardness? |
How easy it is to cut the substance |
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What is density? |
Mass per unit volume |
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What is crude oil? |
A mixture of hydrocarbons of varying lengths |
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What is nanotechnology? |
The making and the use of nanoparticles the size from 1-100 nanometer |
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How are nanoparticles used in sport equipment and in medical equipment? |
Makes sports gear stronger/durable with no added weight
Silver nanoparticles have small surface area to volume ratio making them able to kill bacteria |
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Why are people sceptical of nanoparticle technology? What are the in place precautions? |
The effects are not fully understood, especially long term ones. Items with Nanoparticles in should be labelled |
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How do the varying lengths of crude oil affect it's properties? Why? |
Short means it will have a lower boiling point and will be a gas. Not much energy to break the IMF
Long means it will have a higher boiling point and will be viscous. More energy required to break IMF |
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What happen when you heat crude oil? |
The intermolecular forces can be broken, chain can 'wizz' off as a gas |
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In crude oil can covalent bonds be broken when heated? |
No, the forces are too strong |
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How can crude oil be separated? What does it separate into? |
Fractional distillation Groups of different boiling points/lengths |
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What is crude oil mainly used for? Name some example of its products |
Mainly fuels such as petrol and diesel, other products are like plastics, medicines, fertilisers, lubricating oil |
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What is a polymer? What are they usually based of? |
Many monomers (small molecules) joined together. Usually carbon based |
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How are polymers created? |
Under high pressure |
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What is affected by how close polymers are put together? |
Density |
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How can you change the properties of a polymer? [4] |
• Cross links • Crystalline/branched structure • Chain length • Plasticisers |
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What is nanotechnology? |
1-100 nanometers Natural - salt particles Artificial - sport equipment, socks, medical equipment |
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What is nanotechnology? |
1-100 nanometers Natural - salt particles Artificial - sport equipment, socks, medical equipment |
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Why is the population dubious of nanoparticle technology? |
Effects not yet known, must be labelled |