Hexane And Bromine Reaction Lab Report

Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame. The hydrocarbons become harder to ignite as the molecules get bigger. Combustion of alkanes with bigger molecule will produce more soot as the percentage of carbon of the molecule is higher. The amount of soot produced depends on the percentage of carbon in a hydrocarbon molecule. Hexane and cyclohexene produced very small of light soot due to smaller compound compared to toluene. Aromatic compounds like toluene are high in carbon content and slow to be oxidized. Some of the carbon atoms are converted into elemental carbon in the heat, but escape the flame before they are attacked by oxygen and as the result it burned sluggishly with cool yellow flames and black soot. Alkanes do not react with bromine in dark but react in light. Presence of ultra-violet light or flame, the alkanes will undergo substitution reaction with halogens. For instance, in UV light, hexane reacts with halogen molecules such as bromine and produce …show more content…
Alkene produced less soot as cyclohexene. It can react with bromine as it has a double bond. The anti-addition occurred during the reaction which means the bromine molecules added to the opposite side of the double bond. Alkene also react with potassium permanganate. The brown precipitate formed after the reaction was manganese(IV) oxide. While for unknown B, it was possible to be an alcohol. Alcohol released a lot of the soot during combustion. It does not react with bromine due to absent of carbon-carbon double bond. Primary and secondary alcohol can react with potassium permanganate to form aldehyde or ketone but not tertiary as it does not have hydrogen that attached to carbon. When the primary or secondary alcohol reacted, the solution is decolourised and brown precipitate (manganese dioxide) was