IGCSE Chemistry (0620) — May–June 2023, Paper 33

8 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.

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Question 1 · 6 marks · Giant covalent structures

Answer the following questions using only the elements in Fig. 1.1. Each symbol of the element may be used once, more than once or not at all. Give the symbol of the element that…

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Question 2 · 8 marks · The Periodic Table (Group VII)

Table 2.1 shows some properties of the halogens. halogen melting point in °C boiling point in °C density at r.t.p. in g/cm³ --- --- --- --- fluorine -220 -188 chlorine -101 0.003…

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Question 3 · 10 marks · Water pollution

Polluted water can contain harmful substances such as metal compounds, nitrates and sewage. Name two other substances present in polluted water which are harmful to aquatic life.

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Question 4 · 18 marks · Atomic structure

This question is about bromine and compounds of bromine. Deduce the number of protons, neutrons and electrons in the bromide ion shown. ⁸¹₃₅Br⁻ number of protons ... number of…

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Question 5 · 6 marks · Transition elements

This question is about metals. Nickel is a transition element. Sodium is an element in Group I of the Periodic Table. State two differences in the physical properties of nickel…

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Question 6 · 6 marks · Rate of reaction (temperature)

A student investigates the reaction of magnesium with dilute hydrochloric acid at three different temperatures (20 °C, 30 °C and 40 °C). All other conditions stay the same. Table…

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Question 7 · 13 marks · Unsaturated compounds

Fig. 7.1 shows the displayed formula of compound E (containing a C=C double bond, a -CH₃ group and an -OH group). On Fig. 7.1 draw a circle around the functional group that makes…

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Question 8 · 13 marks · Metals and non-metals

This question is about non-metals. Non-metals are poor thermal conductors. Describe two other physical properties which are typical of non-metals.

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