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90019
Alkanes - CnH2n+2
Description
Mind Map on Alkanes - CnH2n+2, created by rachbreen on 14/05/2013.
Mind Map by
rachbreen
, updated more than 1 year ago
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Created by
rachbreen
about 11 years ago
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Resource summary
Alkanes - CnH2n+2
Hydrocarbons
Saturated, no double bonds
Formed from crude oil
Separated into fractions with different boiling points
Via fractional distillation
Used as fuels/ processed into petrochemicals
Branching lowers VDW, less points of contact = lowered boiling points
Long chains have more points of contact, so more VDW = higher boiling point
Alkanes combust easily
If not enough O2 incomplete combustion = CO
CO lowers affinity of haemoglobin for O2 so respiring tissues dont get O2
Straight chain hydrocarbons processed into branches and cyclic, more efficiently combusted
Catalytic cracking - long fractions passed over catalyst at high temp/mod pressure, to form smaller molecules
Catalyst cuts cost at lower temp/pressure, but speeds up reaction
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