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Flashcards do conjunto (13)
- 1name the two types of materialsnatural and synthetic
- 2what is fractional distillation used for in crude oilit is used to separate the different hydro carbons from the crude oil mixture by using different temperatures.
- 3what is polymerisationpolymerisation is a chemical process where small hydrocarbon molecules (monomers) are joined making longer.. polymers
- 4what happens to the amount of atoms in a reactionnothing, the amount of atoms stays the same from reactants to the products
- 5why is rubber flexible and has a low melting pointthis is because rubber has weak forces between the molecules so they can move over each other allowing it to stretch
- 6what properties do materials with strong covalent bonds havethey are rigid and cannot be stretched
- 7what would increasing the chain length dolonger chain length means a stronger...
- 8what is cross linking and how does it make materials harderit is where atoms between polymer molecules bond stopping them from moving (vulcanisation)
- 9what are plasticisersplasticisers are small molecules which force the chains further apart making the forces weaker
- 10what would closely packed polymer chins doit would make the polymer stronger, more dense and have a higher melting point
- 11what is Nano scienceits the study of materials only a few atoms big (1billionth of a metre)
- 12what things use nano tecsunscreen, plaster, catalytic converters, medical dressings, socks
- 13what do silver nanoparticles help do in many thingsthey help kill many types of bacteria (used in socks)
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- GCSE Chemistry (C2- material choices ) FlashCards sobre Sem título, criado por Jacob Callow em 21-02-2014.
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- Jacob Callow
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