5 (a) Table 5.1 shows information about four metallic elements. Table 5.1 metal reaction of metal with water copper does not react with water iron reacts very slowly with water lithium reacts rapidly with water sodium reacts very rapidly with water (i) State the names of the two metals in Table 5.1 that are transition elements. … and … [1] (ii) Suggest the name of the gas produced when an alkali metal reacts with water. … [1] (iii) Place the four metals in order of reactivity from the most reactive to the least reactive. … most reactive … … … least reactive [2] (b) Copper is extracted by heating copper oxide with carbon. The word equation for the reaction is shown. copper oxide + carbon copper + carbon dioxide (i) Balance the symbol equation for this reaction. …CuO + C …Cu + CO2 [1] (ii) Identify which substance is reduced during this reaction. Explain your answer. substance reduced … explanation … [2] (c) During the extraction of copper, carbon dioxide is released into the air. Carbon dioxide is found in small quantities in clean air. (i) State the names of the two gases which are found in large quantities in clean air. … and … [1] (ii) Carbon dioxide is a greenhouse gas. State the name of one other greenhouse gas. … [1] (iii) Carbon dioxide is released into the air during the combustion of fossil fuels. State the names of two fossil fuels. … and … [1] [Total: 10]

5(a)(i) copper and iron ; 1 5(a)(ii) hydrogen ; 1 5(a)(iii) sodium lithium iron copper ;; 2 5(b)(i) 2CuO + C → 2Cu + CO2 ; 1 5(b)(ii) copper oxide ; loses oxygen ; 2 5(c)(i) oxygen and nitrogen ; (both required) 1 5(c)(ii) methane ; 1 5(c)(iii) coal / petroleum / natural gas – any two for 1 mark ; 1

5 (a) (i) State the percentage of oxygen and of nitrogen in a sample of clean air. oxygen …% nitrogen …% [2] (ii) A sample of air collected near a busy road contains carbon monoxide. Carbon monoxide is made by car engines. Describe how carbon monoxide is made by car engines. … … … … [3] (iii) State one harmful effect of carbon monoxide on the health of a human. … … [1] (b) The atmosphere contains small quantities of sulfur dioxide. Sulfur dioxide causes acid rain. (i) Suggest a pH for acid rain. … [1] (ii) Suggest one adverse effect of acid rain on buildings. … … [1] (iii) Sulfur dioxide is made when sulfur is burned in oxygen. This reaction is called an oxidation reaction. State the meaning of the term oxidation. … … [1] [Total: 9]

5(a)(i) oxygen 21% ; nitrogen 78% ; 2 5(a)(ii) incomplete ; combustion ; of gasoline / hydrocarbon ; 3 5(a)(iii) carboxyhaemoglobin production / unconsciousness / death / poisoning ; 1 5(b)(i) any number less than 7 ; 1 5(b)(ii) corrosion of building materials ; 1 5(b)(iii) gain of oxygen ; 1

9 (a) Choose words from the list below to complete the sentences that describe the energy changes occurring when a wind turbine is used. Each word may be used once, more than once or not at all. electrical kinetic light potential thermal sound The kinetic energy of the wind is transferred to the … energy of the moving rotor blades of the wind turbine. The useful output energy from the wind turbine is … energy. The wind turbine makes sound energy which is unwanted. Another unwanted form of energy made by wind turbines is … energy. [2] (b) State one advantage of using wind rather than coal to generate electricity. … … [1] (c) (i) One disadvantage of wind turbines is they give out very low frequency sound waves. State what is meant by the frequency of a wave. … … [1] (ii) The frequency of the sound waves produced is very low. A healthy human ear can only just hear this sound. Suggest a value for this frequency. … Hz [1] (d) Magnets are used in the generators of wind turbines. Fig. 9.1 shows a bar magnet. S N Fig. 9.1 On Fig. 9.1, draw the pattern and direction of the magnetic field lines around the magnet. [2] (e) Another method of generating electricity is to use nuclear fission in a nuclear power station. During nuclear fission, α‑particles, β‑particles and γ‑rays may be released from atoms. (i) Complete Table 9.1 to show the properties of α‑particles, β‑particles and γ‑rays. Table 9.1 radiation ionising ability nature penetrating ability α‑particle high helium nucleus β‑particle medium medium γ‑ray electromagnetic wave [3] (ii) Describe what happens to the nucleus of an atom during nuclear fission. … … [1] [Total: 11]

9(a) kinetic electrical thermal ;; 2 9(b) does not use up a fossil fuel ; does not produce CO2 / cause global warming etc. ; renewable ; AVP ; max 1 1 9(c)(i) number of waves produced per second / passing a fixed point per second ; 1 9(c)(ii) in range from 20 Hz to 50 Hz ; 1 9(d) correct field lines ; arrows from N to S ; 2 9(e)(i) α – low penetrating ability ; β – electron ; γ – low ionising ability and high penetrating ability ; 3 9(e)(ii) splits ; 1 For (a), fill in the blanks with 'kinetic', 'electrical', and 'thermal' in order. For (b), state one advantage such as 'does not use up a fossil fuel', 'does not produce CO2', or 'renewable'. For (c)(i), define frequency as the 'number of waves produced per second' or 'passing a fixed point per second'. For (c)(ii), state a frequency in the range of 20 Hz to 50 Hz. For (d), draw correct magnetic field lines and include arrows pointing from North to South. For (e)(i), describe alpha as having 'low penetrating ability', beta as an 'electron', and gamma as having 'low ionising ability and high penetrating ability'. For (e)(ii), state that the nucleus 'splits'.

11 (a) (i) Table 11.1 shows information about three colourless liquids J, K and L. Complete Table 11.1 by inserting the pH for pure water. Table 11.1 liquid description pH J acid rain 4 K dilute sulfuric acid 2 L pure water [1] (ii) Name one gas that causes acid rain. … [1] (iii) Name the indicator used to find the pH of a liquid. … [1] (b) A student reacts dilute sulfuric acid with four metals. The student's observations are shown in Table 11.2. Table 11.2 metal observation copper does not react iron reacts slowly lithium reacts explosively magnesium reacts rapidly Place the four metals in order of their reactivity from the most reactive to the least reactive. … most reactive … … … least reactive [2] (c) Table 11.2 shows that magnesium reacts rapidly with sulfuric acid. (i) State the name of one of the products of this reaction. … [1] (ii) Suggest two ways of increasing the rate of reaction between magnesium and dilute sulfuric acid. 1 … … 2 … … [2] (iii) The gas formed in this reaction is not a greenhouse gas. State the names of two greenhouse gases. 1 … 2 … [2] [Total: 10]

11(a)(i) 7; 1 11(a)(ii) sulfur dioxide / nitrogen dioxide; 1 11(a)(iii) universal ; 1 11(b) lithium magnesium iron copper ;; 2 11(c)(i) hydrogen / magnesium sulfate; 1 11(c)(ii) increase temperature; increase surface area of magnesium; increase concentration of acid; max 2 2 11(c)(iii) carbon dioxide; methane; 2 (a)(i) To earn this mark, a student must state the pH of pure water as 7. (a)(ii) To earn this mark, a student must name either sulfur dioxide or nitrogen dioxide as a gas that causes acid rain. (a)(iii) To earn this mark, a student must name universal indicator as the indicator used to find pH. (b) To earn these marks, a student must list the metals in the correct order of reactivity from most to least reactive: lithium, magnesium, iron, copper. (c)(i) To earn this mark, a student must name either hydrogen or magnesium sulfate as a product of the reaction. (c)(ii) To earn these marks, a student must suggest two distinct ways to increase the reaction rate, such as increasing temperature, increasing the surface area of magnesium, or increasing the concentration of the acid. (c)(iii) To earn these marks, a student must name two greenhouse gases, such as carbon dioxide and methane.

Cambridge IGCSE Co-ordinated Sciences · 0654

IGCSE Co-ordinated Sciences (0654) Chemistry of the environment past paper questions

Revise IGCSE Co-ordinated Sciences (0654) — Chemistry of the environment with real Cambridge past-paper questions grouped by topic, each shown with its marking scheme. Working one topic at a time targets exactly the skill each question tests.

105 free questions from 2016–2021, each with its marking scheme. Open the full topical bank to filter by subtopic, paper, and year.

Chemistry of the environment in IGCSE Co-ordinated Sciences 0654 exams, 2020–2025

Across 2020–2025, Chemistry of the environment accounted for 164 questions worth 874 marks in Cambridge IGCSE Co-ordinated Sciences (0654) papers.

By year
Year	Questions	Marks
2020	20	68
2021	23	103
2022	26	165
2023	42	214
2024	30	205
2025	23	119

Most-tested subtopics

C10.2 Air quality and climate621 marks
C10.1 Water199 marks

Appears in

Paper 1 · 42 qs
Paper 2 · 43 qs
Paper 3 · 53 qs
Paper 4 · 23 qs
Paper 6 · 3 qs

All most-tested Co-ordinated Sciences topics

2021 May/Jun · Paper 3 · Q5 · 10 marks
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2021 Oct/Nov · Paper 3 · Q5 · 9 marks
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2021 Oct/Nov · Paper 3 · Q9 · 11 marks
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2021 Feb/Mar · Paper 3 · Q11 · 10 marks
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2021 May/Jun · Paper 1 · Q8 · 1 mark
Marking scheme
Mark scheme — 2021 Paper 1 Q8
Answer: C
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