AS & A Level Chemistry (9701) — October–November 2023, Paper 22
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The elements silicon, phosphorus and sulfur are in Period 3 of the Periodic Table. Describe the variation in atomic radius from silicon to sulfur.
Answer this question and get it marked →NO and NO2 react at 25 degrees C to give N2O3 as shown in the equation. NO(g) + NO2(g) <= N2O3(g) delta H = -7.2 kJ mol^-1 The reaction is reversible and reaches equilibrium in a…
Answer this question and get it marked →Phosphoric(V) acid, H3PO4, is used in both inorganic and organic reactions. H3PO4 is made in a two-step process from phosphorus. Step 1: Phosphorus reacts with an excess of oxygen…
Answer this question and get it marked →Lactic acid, CH3CH(OH)COOH, and pyruvic acid, CH3COCOOH, both contain two functional groups. [Fig. 4.1 shows the displayed structures of lactic acid (a central carbon bearing H,…
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