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chemistry paper 2
organic chemistry
cracking
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Created by
Umar Khan
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Cards (12)
what is the difference between alkanes and alkenes
alkanes only have single
covalent
bonds between the
carbon atoms
whereas alkenes have at least one double covalent bond between the carbon atoms
why do long chain hydrocarbons not make a good fuel
they arent very
flammable
why is it a problem that long chain hydrocarbons dont make good fuels
theres a high demand for
short chain
hydrocarbons to be used as fuels
how do you solve the problem of there being a high demand for short chain hydrocarbons but there arent any
convert long chain hydrocarbons to short chain hydrocarbons using
cracking
what are shorter chain alkanes used for
fuels
eg in cars
what happens in the reaction of cracking
a different type of molecule was made called an
alkene
what are the 2 types of cracking
-
catalyctic cracking
-
steam cracking
what happens in catalyctic cracking
we use high
temperature
and a
catalyst
, the job of the catalyst is to speed up the
reaction
what happens in steam cracking
we use high
temperature
and steam
what are alkenes used for
-used to make chemicals called
polymers
-used as the starting material for other useful chemicals as well
what is one key fact about alkenes
they are more
reactive
than
alkanes
how do we test for alkenes
-using
bromine
water which is orange
-if we shake the bromine water and it turns colourless alkene is present
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