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Alkanes - Coggle Diagram
Alkanes
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Physical
Properties
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ISOMERS
with same RMM...
-
molecules with branched chains have
- FEWER points of contact
- DECREASES strength of VDW forces
- LOWERs b.pt.
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Reactivity
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COMBUSTION
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Incomplete - produce
CO, Water + soot (C)
dangers of CO
- absorbs faster than O2
- reacts with haemoglobin
in RBC cells preventing
carrying from O2
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Pollution
Acid
Rain
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PROCESS
- SO2 + H2O -----> H2SO3
(sulfurous acid/ sulfuric (IV) acid
- sulfurous acid oxidised to form
sulfuric acid - H2SO4
- When fossil fuels are burnt,
sulfur dioxide is released
S + O2 ----> SO2
- defoliates + destroys trees + vegetation
- corrodes buildings
- kills fish
Photochemical
Smog
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formed when:
- nitrogen oxides
- sulfur dioxides
- unburned hydrocarbons
react with SUNLIGHT
- eye irritation
- nasal congestion
- respiratory problems
Global
Warming
Greenhouse
Effect
-
- Gases (water vapour, methane + CO2)
good at absorbing radiation + heating
atmosphere up
1.electromagnetic radiation from
sun reaches Earth -
- some reflected back into space
- rest absorbed + heats up earth
-
- Increased dependency of
fossil fuels for mankind =
- rapid increase conc. CO2
in atmosphere =
- increase average surface temp
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Catalytic
Converters
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Why work better
@ 150°C+?
- higher temp
- more collisions
- works more effectively
honeycomb structure -
- allows gas to pass through
- large SA for reaction to take
place
coated w/ layer of platinum & rhodium -
- metal expensive
- but thin coating keeps
costs down
leaded petrol stop catalyst from
working as coats surface w lead,
rendering metal catalyst passive