569406
Description
Flashcards by Jacob Callow, updated more than 1 year ago
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Created by Jacob Callow
over 10 years ago
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| Question | Answer |
| name the two types of materials | natural and synthetic |
| what is fractional distillation used for in crude oil | it is used to separate the different hydro carbons from the crude oil mixture by using different temperatures. |
| what is polymerisation | polymerisation is a chemical process where small hydrocarbon molecules (monomers) are joined making longer.. polymers |
| what happens to the amount of atoms in a reaction | nothing, the amount of atoms stays the same from reactants to the products |
| why is rubber flexible and has a low melting point | this is because rubber has weak forces between the molecules so they can move over each other allowing it to stretch |
| what properties do materials with strong covalent bonds have | they are rigid and cannot be stretched |
| what would increasing the chain length do | longer chain length means a stronger... |
| what is cross linking and how does it make materials harder | it is where atoms between polymer molecules bond stopping them from moving (vulcanisation) |
| what are plasticisers | plasticisers are small molecules which force the chains further apart making the forces weaker |
| what would closely packed polymer chins do | it would make the polymer stronger, more dense and have a higher melting point |
| what is Nano science | its the study of materials only a few atoms big (1billionth of a metre) |
| what things use nano tec | sunscreen, plaster, catalytic converters, medical dressings, socks |
| what do silver nanoparticles help do in many things | they help kill many types of bacteria (used in socks) |
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