CIE Nov 2015 v2 Paper 5 Q2

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In an experiment to determine the relative molecular mass of hexane, boiling point 69 C, a specialist piece of apparatus called a Victor Meyer tube can be used. This consists of a long tube with a bulb at the base in which a sample can be vaporised. The tube has a side arm to allow the escape of gas from within the tube. The tube is surrounded by another which can be used to heat the contents of the first tube. A diagram of the apparatus is shown below. PMT stopper small sample tube hexane Victor Meyer tube sand A small sample tube containing the hexane is inserted at the top of the Victor Meyer tube. The sample tube is small enough to fit inside the Victor Meyer tube and falls freely onto the hot sand below. The sand will cushion its fall so that the sample tube does not break. The stopper is then quickly replaced at the top of the Victor Meyer tube. The hot sand causes the hexane to vaporise and expel air contained in the Victor Meyer tube. (c) Complete the diagram above to show: how the apparatus should be heated, a connection to further apparatus which would allow the air expelled from the Victor Meyer tube when the sample of hexane is vaporised to be collected and measured. [2] (d) Suggest one hazard associated with the use of hexane.[1]UCLES 2015 9701/52/O/N/15 [Turn over<br /> PMT (e) (i) With the gas collection apparatus connected to the heated Victor Meyer tube, expelled air will be collected before the hexane is introduced. Explain why.[2] (ii) At which stage of the experimental procedure should the sample tube be dropped into the Victor Meyer tube?[1] (f) State what measurements you would need to make in order to determine the relative molecular mass of hexane.[3] [Total: 15]UCLES 2015 9701/52/O/N/15<br />

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