Argon, oxygen and nitrogen are obtained from air by fractional distillation. Liquid air at, is warmed up and the gases collected one by one. Explain why fractional distillation is used rather than simple distillation.
Important Questions on Separating Substances
In a chromatography experiment, eight coloured substances were spotted on a piece of filter paper. Three were the basic coloured red, blue and yellow. The other was unknown substances, labelled A-E. This shows the resulting chromatogram :
Which one of substance A-E contains only one basic colour?
In a chromatography experiment, eight coloured substances were spotted onto a piece of filter paper. Three were the basic coloured red, blue and yellow. The other were unknown substances, labelled A-E. This shows the resulting chromatogram :
Which contains all three basic colours?
In a chromatography experiment, eight coloured substances were spotted on a piece of filter paper. Three were the basic coloured red, blue and yellow. The other was unknown substances, labelled A-E. This shows the resulting chromatogram :
The solvent was propanone. Which of the three basic colours are the most soluble in propanone?
The diagram below shows a chromatogram for a mixture of amino acids.
The solvent was a mixture of water, butanol and ethanoic acid. Using the table of values given, identify the two amino acids.
