Organic chemistry topic 7 Flashcards
What 2 elements do hydrocarbons contain?
hydrogen and carbon
What is the general formula for alkanes?
Cn H 2n+2
What 2 waste products form the complete combustion of hydrocarbons?
CO2 + water vapour
Where are the shortest carbon chains found in the fractional distillation column?
the top
Give 3 products that can be made from crude oil
petrol, diesel, kerosene
Why is cracking used?
to make shorter hydrocarbons which are more useful
What is an alkene?
hydrocarbons with a double bond between 2 carbon atoms
Give the general formula of an alkene
Cn H2n
Why do alkenes burn in air with a smoky flame?
as if there isn’t enough oxygen combustion is incomplete and we have a smoky flame.
What is used to test for alkenes?
bromine water plus alkene means orange goes colurless
What type of compounds are used as the monomers to make addition polymers?
carbon based compounds
Give the names and formulas of the first four alcohols
methanol= CH3 OH Ethanol=C2 H5 OH
propanol=C3 H7 OH butanol = C4 H9 OH
Give the balanced equation for the combustion of methanol?
2CH3 OH + 3 O2 = 2CO + 4 H2O
