CHEM 2203 Midterm: Exam-CHEM2302-2002December
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N o . o f s t u d e n t s : + 7. ^ " ^ - t ^ l t , : 1 , 3 2 f 1 l b a f , t. 1 l l o / / c b a n r - Define the concept of a site to be analysed. 4 describe why sample preconcentration is often required. For oft-site analysis. explain what precautions are required for preservationm, transdort and storase: define sample clean-up. 7 what methods are often used for anal"6e separation. Use these equations to show the difference in behaviour of two different analyes, Explain how these trvo different separation behaviours lead to two different retention times. t2 identify the two main forms of separation used in chemical analysis l l. Use the concept of the height equivalent theoretical plate to explain why chromatography columns are usually long and thin .
