1alkenes Flashcards
all alkenes contain a
double carbon bond
molecular formula of ethene
C2H4
molecular formula of propene
C3H6
alkenes are
a homologous series of hydrocarbon compounds with at least one double bond between two of the carbon atoms on the chain
general formula for alkenes are
CnH2n
alkenes are more desirable than alkanes as they are
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
alkenes are used to
make polymers and are the starting materials in the production of many other chemicals
bromine water test
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
when bromine water is added to an alkane
it will remain as an orange solution as alkanes do not have double carbon bonds so the bromine remains in solution
when bromine water is added to an alkene
the bromine atoms add across the double carbon bond hence the solution no longer contains free bromine so it loses its colour