4.5 Alkenes
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What is the general formula Alkenes
CnH2n
what is the difference between alkanes and alkenes
alkanes have singular bonds alkenes have double bonds
what is the molecular formular for Ethene
C2H4
what is the molecular formular for Propene
C3H6
what is the molecular formular for Butene
C4H8
what is the molecular formular for Pentene
C5H10
are alkenes referred to as saturated or unsaturated
unsaturated -because they have a double bond
How do alkenes react with bromine
by breaking the double bonds and adding bromine atoms in
what type of reaction does alkene have
Addition
what conditions does addition need
• no need for UV light because alkenes are more reactive than alkanes • it works with pure bromine liquid or bromine water (which is orange) • The reaction turns from orange to colourless (because bromine is used up in the reaction)
what is the reaction between bromine and alkenes used for
test for the double bond in unsaturated compounds - stays orange- no c=c saturated - turns colourless c=c bond present (unsaturated)
what are additional polymers
• inert • chemically unreactive • don’t break down very easy
what are the options for disposal of unwanted polymers
• re use it • recycle • incinerate it and use the energy for electricity • chuck it onto landfill
What does a homologous series mean
• Similar chemical reactions • same trends in physical properties (boiling point, viscosity or colour) • The same functional group