1alkenes Flashcards

1
Q

all alkenes contain a

A

double carbon bond

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2
Q

molecular formula of ethene

A

C2H4

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3
Q

molecular formula of propene

A

C3H6

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4
Q

alkenes are

A

a homologous series of hydrocarbon compounds with at least one double bond between two of the carbon atoms on the chain

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5
Q

general formula for alkenes are

A

CnH2n

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6
Q

alkenes are more desirable than alkanes as they are

A

more reactive due to the presence of there carbon double bond so they can take part in reactions in which alkanes can’t, making them more useful than alkanes

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7
Q

alkenes are used to

A

make polymers and are the starting materials in the production of many other chemicals

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8
Q

bromine water test

A

Alkanes and alkenes have different molecular structures
All alkanes are saturated and alkenes are unsaturated
The presence of the C=C double bond allows alkenes to react in ways that alkanes cannot
This allows us to tell alkenes apart from alkanes using a simple chemical test called the bromine water test

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9
Q

when bromine water is added to an alkane

A

it will remain as an orange solution as alkanes do not have double carbon bonds so the bromine remains in solution

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10
Q

when bromine water is added to an alkene

A

the bromine atoms add across the double carbon bond hence the solution no longer contains free bromine so it loses its colour

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