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C2 - Material Choices
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- 1C2 - Material ChoicesLiv Ennis
- 2What are natural materials?Materials are chemicals or mixture of chemicals eg metals
some materials come from living things eg cotton, paper (plants), silk and wool (animals - 3What is a synthetic material?Produced by chemical synthesis, can be made as alternatives, starting from materials from the earths crust
- 4Where is Crude Oil found?The earths crust
- 5What is Crude Oil?Thick black liquid, made up of a mixture of hydrocarbons
- 6How is Crude Oil separated?Fractional distillation into useful fractions
- 7Explain the fractional distillation tower1. crude oil heated, evaporate all hydrocarbons
2.vapour passes into fractionating column near bottom cools down as rises
3. each fraction condenses to liquid runs off when cooled below its boiling point
4. remaining gases leave the tower at top and used as gaseous fuels - 8What are intermolecular forces?Force that hold molecules together in a solid or liquid
- 9Explain intermolecular forces1. longer the hydrocarbon molecules, the stronger the forces are
2. stronger intermolecular forces need more energy to overcome them, so high temperature is needed to boil for longer hydrocarbon fractions - 10What are the different properties of a material?- different melting points/densities
- can be strong or weak (tension/compression)
- rigid or flexible, hard or soft
- will be suited to some uses - 11What is polymerisation?An important chemical process, small hydrocarbon molecules (monomers) join together to make very long molecules (polymers)
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- Fichas sobre C2 - Material Choices , creado por Liv-Ennis el 07/05/2015.
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