Alkenes

what is the general formula of an alkene
CnH2n
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is an alkene saturated or unsaturated
unsaturated
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what is the bond angle of a C=C double bond
120
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What does a double covalent bond consist of
A sigma bond and a pi bond
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Why are pi bonds vulnerable to electrophiles
They are exposed and have a high electron density
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what is an electrophile
an electron pair acceptor
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what is an addition reaction
a reaction where two molecules are added together to make one
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Describe briefly the reaction the reaction of bromine with alkenes
Br2 molecule approaches the alkene Pi bond electrons repel br2 molecules inducing a dipole and Br2 becomes polar.
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Describe briefly the reaction of alkenes with hydrogen bromide
There is a dipole in HBr because of electronegativity the partially positive H+ is attracted to the more electron rich pi bond
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What is Markownikoffs rule
In most cases bromine will be attracted to the carbon with the least hydrogens around it.
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what is the order of stabilities for carbocations
tertiary>secondary>primary
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how is the major product formed in electrophilic addition
It is by the more stable carbocation
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Describe briefly the reaction of alkenes with sulphuric acid
The alkene is changed into alkyl hydrogensulphate this is then hydrolysed to form an alcohol
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what is the H2SO4 in the reaction
It is a catalyst as it is regenerated
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describe the test for alkenes using bromine water
Bromine water will decolourise in the presence of a double bond
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how are addition polymers formed
formed from alkenes and substituted alkenes
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when should you add a lower case n when drawing addition polymers
when there are many repeating units
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how should you draw an addition polymer
draw out the monomers with groups of atoms arranged around the double bond
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why are polyalkenes unreactive
it is due to the long C-C and C-H bonds.
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describe some of the properties of polychloroethene
waterproof,electrical insulator and doesn't react with acids
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what are the uses of of polychloroethene
used to make window frames and guttering
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what happens if a plasticiser is added to polychloroethene
intermolecular forces are weakened which allows the chain to move more easily
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Other cards in this set

Card 2

Front

is an alkene saturated or unsaturated

Back

unsaturated

Card 3

Front

what is the bond angle of a C=C double bond

Back

Preview of the front of card 3

Card 4

Front

What does a double covalent bond consist of

Back

Preview of the front of card 4

Card 5

Front

Why are pi bonds vulnerable to electrophiles

Back

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