Edexcel Jan 2017 (IAL) Paper 4 Q19

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18 Which of the following statements about gas chromatography (GC) is true? It is only carried out at room temperature. It can be used for samples which decompose when they are vaporised. It can be used for non-volatile substances. It can be used to measure the amount of each component in a mixture. 19 The mass spectrum of dichloroethene, C2H2Cl2, has large peaks at m / e values of 61 and 63 due to fragmentation when a C Cl bond breaks. (Total for Question 18 = 1 mark) D O N O T W R I T E I N T H I S A R E A The only isotopes present in the fragment forming the peak at m / e = 63 are 12C, 1H and 35Cl. 14C, 1H and 35Cl. 12C, 2H and 37Cl. 12C, 1H and 37Cl. Use this space for any rough working. Anything you write in this space will gain no credit. (Total for Question 19 = 1 mark) *P48372RA0828* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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