alkanes and their properties Flashcards
(40 cards)
1
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Topic 7: Organic Chemistry
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2
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Alkanes and their Properties
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3
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Crude oil a fossil fuel formed mosy from dead sea creatures (eg. plantion). It is the source of many fuels and other
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4
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chemicals such as plastic
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5
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It is a mixture of hydrocarbons
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Hydrocarbons are compounds made up of hyduagen & Carbon atons only
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7
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Most of the hydrocarsons in crude oil are of a group called alkanes
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AlKanes are made up of a chain of carbon atoms
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with as many hydrogen atoms bonded to it as possible.
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E.g. This is propane
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the alkane with 3 carbors
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No.of C
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Moleculav
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12
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H
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- HI
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н н
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in the chain
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Displayed Formuta
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Formula
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Name
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5 = pentane
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6 - ректале уелу
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7= heptane memorise the
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8= ictane first 1.
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CHu
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Methane
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H
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Н Н
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Mnemonic:
2
С2н6
Ethane
H H
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H - С - С - С -н
н н н
Peanut
Butter
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СзН8
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Propane
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4
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Н-С- С- С-С-н
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Н ННН
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Butane
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Geneval Formula: CnHan+2
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Take number of Catoms
x2 and +2 and you get number of Matoms.
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The properties of alkanes change with the number of carbons in the molecule.
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boiling point increases
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→ IMF between molecules get strangen.
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the viscosity (thickness) increases
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1) longer molecules get tangled together
