Chemistry 9701: ANALYTICAL TECHNIQUES Topical Past Paper Questions

(a) Using a gel buffered at pH 7.6, electrophoresis is performed on a mixture of three amino acids: asparagine, histidine and lysine. Figure 9.1 The isoelectric points of these amino acids are given in Table 9.1. Table 9.1 Describe the direction of movement of each amino acid dur…

(a) Compound Z is used in organic synthesis. Complete Table 6.1 to show the number of sp, sp $ ^{2} $ and sp $ ^{3} $ hybridised carbon atoms present in one molecule of Z. Table 6.1 [1] (b) Z can undergo different reactions, as shown in Fig. 6.1. Fig. 6.1 (i) Name the two types o…

Amino acids are molecules that contain —NH_{2} and —COOH functional groups. Glycine, $ H_{2}NCH_{2}COOH $, is the simplest stable amino acid. (a) The isoelectric point of glycine is 6.2. (i) Define isoelectric point. [1] (ii) Draw the structure of glycine at pH4. (b) Fig. 6.1 sho…