GCSE: OCR gateway: C1: Clean air + Making polymers
- Created by: 09tvzutphen
- Created on: 04-04-14 16:44
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- C1
- Clean Air
- What is in clean air?
- 78% Nitrogen, 21% Oxygen, and of remaining 1%: 0.0035% CO2
- Percentage of CO2 in air increased slightly due to: Deforestation + increased population
- The Atmosphere
- Gases escaping from interior of earth created the original atmosphere
- Plants that could photosynthesis removed carbon dioxide and added oxygen
- One theory is that the atmosphere was originally rich with water vapour and carbon dioxide
- The vapour condensed to form oceans and the carbon dioxide dissolved into the water
- The percentage of nitrogen slowly increased and due to it being unreactive little was removed
- The vapour condensed to form oceans and the carbon dioxide dissolved into the water
- Gases escaping from interior of earth created the original atmosphere
- Pollution Control
- Sulfur dioxide causes difficulties for people with asthma
- It can dissolve into water to form acid rain that damages wildlife and sandstone buildings
- A car is fitted with a catalytic converter that changes carbon monoxide into carbon dioxide
- In a catalytic converter a reaction with: NITRIC OXIDE + CARBON MONOXIDE takes place on the surface of the catalyst.
- 2CO + 2NO = N2 + 2CO2
- In a catalytic converter a reaction with: NITRIC OXIDE + CARBON MONOXIDE takes place on the surface of the catalyst.
- Sulfur dioxide causes difficulties for people with asthma
- What is in clean air?
- Making Polymers
- Hydrocarbons
- Alkanes
- Single covalent bonds
- Saturated
- Polymer
- Alkenes
- Double covalent bond between carbon atoms
- Double bonds involve two shared pairs of electrons
- Unsaturated
- Monomer
- Double covalent bond between carbon atoms
- Bromine is used to test for an alkene; orange to colourless
- This forms a dibromo compound
- Alkanes
- Polymerisation
- Where many alkene monomers react to give a polymer
- Needs: High pressure + Catalyst
- During reaction a long chain is made until it is stopped
- Reaction causes the double bond in the monomer to break and each of the two carbon atoms form a new bond
- Hydrocarbons
- Clean Air
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