Alcohols/ Alkenes/ Reactions Flashcards
what happens during cracking with solid catalyst (catalytic)
hydrocarbon vapour is passed over a hot powdered catalyst
what happens during a hydrocarbon cracking using a steam catalyst (steam cracking)
hydrocarbon vapour mixed with steam at very high temperature
what are the two methods of cracking also called and why
thermal decomposition reactions; where gear is used to break a compound into smaller fragments
what do alkenes have (2)
one double bind between carbons
4 lines/ bonds between carbons
what are the first 4 members of alkenes from smallest hydrocarbon chain to longest
ethene (2) propene (3) butene (4) pentene (5)
how do you test for alkenes/ alkanes
bromine water + alkane = no colour change/ stays orange
bromine water + alkene= turns colourless/ orange -> clear
why do they crack hydrocarbons ?
high demand for fuels with small molecules
alkenes used to produce polymers / plastics
draw ethene
H H
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H—C=C—H
what is the general formula for alkenes
Cn H2n
why are alkenes unsaturated
bc they contain fewer hydrogen atoms than alkanes with the same number of carbon atoms
what are the 3 things alkenes react with
halogens
hydrogen
water
draw the reaction of ethene and bromine/hydrogen by using X and Y
look at booklet
describe what happens to the diagram when an alkene reacts with water/ hydrogen and a halogen
loss of double bond
H and OH are added
two hydrogen atoms added
two halogen atoms added
what is the functional group of alcohol
-O-H
what are the first 4 members of alcohols from the smallest carbon chain to longest
methanol (1) ethanol (2) propanol (3) butanol (4)
