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alcohol + oxygen = ?
CO2 + H2O
is alcohol + oxygen = carbon dioxide + water an exothermic or endothermic reaction?
exothermic
is the combustion of alcohols a redox reaction or an oxidation reaction?
redox
give 2 examples of strong inorganic oxidising agents to oxidise alcohols
KMnO4 & K2Cr2O7
explain primary alcohols
they have a -OH bonded to 1 alkyl group
what can primary alcohols oxidise to?
oxidise to form aldehydes & can oxidise further into carboxylic acids
explain secondary alcohols
they had a -OH group bonded to a carbon attached to 2 alkyl groups
what can oxidised secondary alcohols form?
ketones
explain tertiary alcohols
they dont react / they don’t normally oxidise by heating in the presence of a strong oxidant
what are 2 examples of strong oxidants?
CrO2²- & MnO4^-
what is the colour change of diCr ions in water?
orange
relating to colour change what happens to dichromate ions when oxidising alcohols?
when oxdising an alcohol, dichromate ions reduce to chromium ions (Cr³+) which cause the colour green
relating to colour change what happens to KMnO4 when oxidising alcohols? include the orginal colour of KMnO4
KMnO4 = deep purple
MnO4- reduces to Mn2+ ions which create a very pale pink (clear) colour
do primary alcohols produce faster than secondary alcohols?
yes