Chemistry unit 2

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explane the combustion of alkanes
burn readily in air to produce carbon dioxide and water
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explain the process pf frcational distilation
crude oil is vapourised into the colum, the vapour rises up the colum it stops at it biolng point, the hydrocarbons consends and are tapped off
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explain the bioling temps in colum
the lowwr the boiling temp the hygher up the colum and they are spereated accordign too vcahin length and boiling point
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what are the molecules like at the top of the coloum
short, less viscouse, less volitile lower boiling pounts
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explai what cracking is
cracking is where ling chain hydrocarbons are broken down into shorter chain hydrocarbons that are more useful
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what is thermal cracking
alkanes are heated up at high tepms and at low pressure, undergo homolitic fissio to break the carbon covalent bonds, free radicals are produced and shorter alkanes and akenes are orduced
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what is catalytic cracking
alkane is passed over aluminuim catalsyt at low temos and low ressuree s undercoes hetelicitc fission
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describe the intermolecular forves and how ot effects boiling point
hudrocarbons have weakiduced dipole- iduced dipole, samll surface area means that lower and de waals forves, which lowers the boiling
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finish sentence when chain length increases
the boiling point inceases
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chlotonation of alkanes initiation
react with halogens under uv light and undergo hoolictic fission cl = 2cl*
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chlotonation of alkanes propagation
radiacls are very reactive CH4 + CL* = HCL
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Card 2

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explain the process pf frcational distilation

Back

crude oil is vapourised into the colum, the vapour rises up the colum it stops at it biolng point, the hydrocarbons consends and are tapped off

Card 3

Front

explain the bioling temps in colum

Back

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Card 4

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what are the molecules like at the top of the coloum

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Card 5

Front

explai what cracking is

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