C1- Carbon Chemistry

Everything in OCR Gateway C1 uptill Esters

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  • Created by: SRB000
  • Created on: 01-05-16 18:45
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For OCR Gateway GCSE Triple Science.
C1 Carbon Chemistry Revision
Key Words for Crude Oil:
Hydrocarbon: A molecule made up of hydrogen and carbon atoms only
Crude Oil: A mixture made of only hydrocarbons.
Alkane: A saturated hydrocarbon that has single covalent bonds only. CnH2n+2
Alkene: An unsaturated hydrocarbon that has a double bond. CnH2n
Intermolecular: The force between different molecules
Intramolecular: The force between the atoms of a molecule
Cracking: Separating long length alkanes in crude oil into shorter lengths alkanes and alkenes.
Fractional Distillation: The process of separating crude oil into different oils depending on the chain length and
boiling points.
What makes a good fuel?
Availability
State at room temperature
Energy produced per kg
Cost per kg
Supply left
Pollution caused
Polymerisation:
Polymers and plastics are made by joining lots of alkenes together.
They are used for things like: Poly(ethene)Bottles, Poly(propene)Car headlight covers etc.
Polymerisation: The reaction of alkenes joining together to form big molecules and very long chains from small
monomers.
This process requires a lot of pressure and a catalyst to break the strong double covalent bond.
Evolution of the atmosphere:
Nitrogen: 78%
Oxygen: 21%
Argon: 0.93%
Carbon Dioxide: 0.035%
Water Vapour: Traces
Carbon Dioxide is produced during respiration and combustion, and is used up in the process of photosynthesis.
Carbon dioxide levels decreased due to plants and human population increasing.
Nitrogen increased due to ammonia +oxygen
Oxygen increased due to plants evolving.

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For OCR Gateway GCSE Triple Science.
Pollution of the atmosphere is caused by the release of three main gases:
1) Carbon Monoxide ­ produced when incomplete combustion takes place eg in car engines ­ is a toxic gas.
2) Sulphur Dioxide ­ formed when fossil fuels are burned ­ causes acid rain.
3) Oxides of Nitrogen ­ formed by the reaction of oxygen and nitrogen at a high temperature eg in a
combustion engine ­ cause smog.…read more

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For OCR Gateway GCSE Triple Science.…read more

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