CHEMISTRY - hydrocarbons

Hydrocarbons
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Crude Oil
a mixture of different compounds (mainly hydrocarbons) that boil at different temperatures - a finite resource found in rocks from the remains of sea animals under high temperatures and pressure and no oxygen
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Seperating Crude Oil
can be seperated by distillation, collecting liwuids with different BPs called fractions
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Alkanes
saturated hydrocabrons - single carbon-carbon covalent bonds - contain the maximum number of hydrogen atoms
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Volatility
tendency to turn into a gas
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Viscosity
how easily a substance flows
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Short Chain Hydrocarbons (properties)
low BP - high volatility - low viscosity - high flammability
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Long Chain Hydrocarbons
high BP - low volatility - high viscosity - low flammability
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Complete Combustion of Hydrocarbons
forms carbon dioxide (tested with limewater) and water (turns blue cobalt chloride paper pink / anyhydrous copper sulphate from blue to white)
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Incomplete Combustion of Hydrocarbons
produces toxic carbon monoxide when there isnt enough oxygen to combyst completely
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Cracking Hydrocarbons (methids)
1. steam cracking - heating a mixture of hydrocarbon vapours and steam to a very hgih temperature / 2. catalytic cracking - passing hydrocarbon vaours over a hot catalyst (during cracking, thermal decomposition produces smaller mollecules called alke
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Alkenes
unsaturated hydrocarbons - have a C=C double covalent bond - dont contain max number of hydrogen atoms - double bond makes them more reactive and alkanes
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Testing for Unsaturated Compounds
alkebes react with bromine water and turn it from orange to colourless
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Other cards in this set

Card 2

Front

a mixture of different compounds (mainly hydrocarbons) that boil at different temperatures - a finite resource found in rocks from the remains of sea animals under high temperatures and pressure and no oxygen

Back

Crude Oil

Card 3

Front

can be seperated by distillation, collecting liwuids with different BPs called fractions

Back

Preview of the back of card 3

Card 4

Front

saturated hydrocabrons - single carbon-carbon covalent bonds - contain the maximum number of hydrogen atoms

Back

Preview of the back of card 4

Card 5

Front

tendency to turn into a gas

Back

Preview of the back of card 5
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