Alkenes - Topic (8 + ) 9 - Paper 2
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What are alkenes?
Unsaturated hydrocarbons with the functional group C=C
Define Homologous Series
A series of compounds with the same general formula
Which is more reactive: alkanes or alkenes? And why?
Alkenes The presence of the C=C functional group gives them a higher reactivity
Give the 3 main properties of Alkenes
Greater reactivity than Alkanes Unsaturated CnH2n general formula
What is a functional group?
A collection of atoms that impact the reactions of an organic compound
What happens during an alkene addition reaction?
A carbon carbon double bond opens up
An unidentified liquid could be either an alkene or an alkane. To test which one it is, the liquid is reacted with bromine water. The bromine water turns from orange to colourless. What type of hydrocarbon is the liquid?
An alkene
What is the functional group of alkenes?
C=C Carbon carbon double bond
Which feature of an alkene allows them to undergo addition reactions?
The C=C double bond They are unsaturated so the carbon double bond can open up and allow the two carbons to bond to atoms of another molecule An addition reaction - a type of reaction where two or more molecules combine to form a larger molecule, with no other products being formed
State the product of an addition reaction between an alkene and hydrogen gas (in the presence of a catalyst)
A saturated alkane
What are the conditions needed for an addition reaction between an alkene and hydrogen gas?
A catalyst