AS & A Level Chemistry (9701) — October–November 2024, Paper 21
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Cobalt, rhodium and iridium are metals in the same group of the Periodic Table. The shorthand electronic configuration of cobalt is [Ar]3d⁷4s². Identify what is meant by [Ar] by…
Answer this question and get it marked →Chlorine is one of the elements in Group 17 of the Periodic Table. Describe the colours of the Group 17 elements, chlorine to iodine, at room temperature.
Answer this question and get it marked →The Group 14 elements show a change from non-metallic to metallic character down the group. Table 3.1 shows some properties of two Group 14 elements, C and Sn, in their standard…
Answer this question and get it marked →Propanone, CH₃COCH₃, is an important organic reagent. Fig. 4.1 shows some reactions of propanone and its derivatives. Propanone reacts with KCN and HCN (reaction 1) to give A, a…
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