Alkenes Flashcards
what general formula does alkenes fit?
alkenes are hydrocarbons that fit the general formula CnH2n
how do alkenes work?
they work like alkanes, except that they have one C=C double-bond in their carbon change
what is the formula for ethene?
C2H4
how many ‘n’ does ethene have?
2
what is the formula for propene?
C3H6
how many ‘n’ does propene have?
3
what is the formula for butene?
C4H8
how many ‘n’ does butene have?
4
what is the formula for pentene?
C5H10
how many ‘n’ does pentene have?
5
how do we know alkenes contain the C=C double bond?
the names of alkenes end in ‘-ene’
how is the double bond written in a structural formula?
’=’
e.g. CH2=CHCH2CH3
what are alkenes?
alkenes are a homologous series of organic molecules, like alkanes but slightly different - however they are still a family of molecules
what three key features do alkenes?
- similar chemical reactions
- trends in physical properties (e.g. boiling points, viscosity or colour)
- the same general formula
what are isomers?
- like alkanes, alkenes also have isomers
- but unlike alkanes, their isomers can differ in more than one way