IGCSE Chemistry (0971) — May–June 2023, Paper 31
8 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 shows part of the Periodic Table (elements H, He, C, N, O, Cl, Na, Mg, Al, K, Ca, Fe, Cu, Br, I). Answer using only the elements in Fig. 1.1. Each symbol may be used…
Answer this question and get it marked →Table 2.1 shows some properties of the halogens (melting point in degrees C, boiling point in degrees C, density at r.t.p. in g/cm3): fluorine -220, -188, 0.0016; chlorine -101,…
Answer this question and get it marked →Water from natural sources contains dissolved gases. Choose from the list the gas that is essential for aquatic life. Draw a circle around your chosen answer: argon / hydrogen /…
Answer this question and get it marked →This question is about sulfur and compounds of sulfur. Sulfur has several isotopes. Define the term isotopes.
Answer this question and get it marked →This question is about metals. Iron is a transition element. Potassium is an element in Group I of the Periodic Table. State two differences in the physical properties of iron…
Answer this question and get it marked →A student investigates the reaction of small pieces of zinc of the same mass and size with three different concentrations of dilute hydrochloric acid (1.0, 1.5, 2.0 mol/dm3) in…
Answer this question and get it marked →Fig. 7.1 shows the displayed formula of mesaconic acid (a molecule containing two -COOH carboxylic acid groups, a C=C double bond and a CH3 group). On Fig. 7.1 draw a circle…
Answer this question and get it marked →This question is about nitrogen and compounds of nitrogen. Nitrogen is a non-metal and a poor electrical conductor. Describe two other physical properties which are typical of…
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