Chemical reactions — IGCSE Sciences - Co-Ordinated (0973) questions by topic
Chemical reactions questions ask which system is in equilibrium, whether iron(III) oxide or carbon monoxide is oxidised in blast-furnace extraction, writing a balanced equation for zinc and nitric acid, and identifying which equation shows metal oxidation, worth from 1 to 12 marks in this IGCSE Co-ordinated Sciences set.
Identify, state and calculate top the command words, with explain and write also frequent: write a balanced equation with correct formulae and state symbols, not just word names. 22 real questions from 2023 to 2025 papers sit below. Submitting each answer for instant marking flags oxidised and reduced species swapped the wrong way round before the mistake repeats.
May–June 2025, Paper 11
Solid zinc carbonate reacts with excess dilute hydrochloric acid. Which changes in the conditions increase the rate of this reaction? 1 Increase the concentration of hydrochloric…
Answer this question and get it marked →Which equation shows the oxidation of a metal? A CuO + H₂ → Cu + H₂O B CuO + Zn → Cu + ZnO C Fe₂O₃ + 3CO → 2Fe + 3CO₂ D 2ZnO + C → 2Zn + CO₂
Answer this question and get it marked →May–June 2025, Paper 22
Which processes are physical changes? 1 Hydrogen gas joins with oxygen gas to form steam. 2 Liquid water turns into steam. 3 Cl₂(g) → 2Cl(g) 4 CH₄(l) → CH₄(g) A 1 and 2 B 1 and 3…
Answer this question and get it marked →Equal masses of limestone pieces are reacted with acid in two experiments. Only one change to the conditions is made between experiment 1 and experiment 2. The volume of gas…
Answer this question and get it marked →May–June 2024, Paper 11
Dilute hydrochloric acid reacts with calcium carbonate. The equation is CaCO3 + 2HCl - CaCl2 + CO2 + H2O. Which change increases the rate of the reaction? A decreasing the…
Answer this question and get it marked →Which reactions involve oxidation? 1 C + O2 - CO2 2 2NaOH + H2SO4 - Na2SO4 + 2H2O 3 2Mg + O2 - 2MgO 4 CaCO3 - CaO + CO2 A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
Answer this question and get it marked →May–June 2024, Paper 12
Hydrogen gas is given off when zinc reacts with dilute sulfuric acid. Which piece of apparatus is used to collect the hydrogen gas and measure its volume? A balance B gas syringe…
Answer this question and get it marked →The equation for the reaction between iron(III) oxide, Fe2O3, and carbon is 2Fe2O3 + 3C - 4Fe + 3CO2. Which statement about this reaction is correct? A C is oxidised. B CO2 is…
Answer this question and get it marked →May–June 2024, Paper 21
Magnesium ribbon is reacted with 50 cm3 of dilute hydrochloric acid. Which change does not increase the rate of the reaction? A Increase the concentration of the hydrochloric…
Answer this question and get it marked →Which statement describes a system that is in equilibrium? A There is a resultant force and there is a resultant turning effect on the system. B There is a resultant force but…
Answer this question and get it marked →May–June 2024, Paper 22
In which equation is the underlined substance acting as an oxidising agent? (the underlined substance is shown in capitals/context) A AgNO3 + NaCl - AgCl + NaNO3 (AgNO3…
Answer this question and get it marked →May–June 2024, Paper 42
Some students investigate the reaction between marble chips and dilute hydrochloric acid, using chips of three different sizes A, B and C with excess acid, measuring the volume of…
Answer this question and get it marked →October–November 2024, Paper 41
Zinc reacts with dilute nitric acid to produce zinc nitrate and hydrogen gas. Write a balanced equation for this reaction.
Answer this question and get it marked →May–June 2023, Paper 11
Which statement shows that methane, CH4, is oxidised when it burns? A The products of the reaction are gaseous. B The products of the reaction are water and carbon dioxide. C The…
Answer this question and get it marked →The diagrams show all the forces acting on each of four objects. [Diagrams A-D: A has 6.0+2.0 N left vs 8.0 N right, 4.0 N up vs 4.0 N down. B has 8.0 N left vs 5.0+3.0 N right,…
Answer this question and get it marked →May–June 2023, Paper 12
Iron is extracted from its ore in the blast furnace. One of the reactions involved is shown. Fe2O3 + 3CO - 2Fe + 3CO2 Which statement is correct? A Iron(III) oxide and carbon…
Answer this question and get it marked →May–June 2023, Paper 21
Which row explains why increasing the concentration of a reactant increases the rate of reaction? A proportion of particles with the minimum energy to react: increases; collision…
Answer this question and get it marked →May–June 2023, Paper 22
Which statement explains why increasing the concentration of reactants increases the rate of a reaction? A The proportion of particles that possess the activation energy is…
Answer this question and get it marked →May–June 2023, Paper 31
An iron nail rusts when it is exposed to damp air. Rusting involves the oxidation of iron. State what is meant by the term oxidation.
Answer this question and get it marked →October–November 2023, Paper 11
When petrol burns in a car engine, carbon monoxide, CO, and nitrogen monoxide, NO, are produced. These gases pass through a catalytic converter where carbon monoxide reacts with…
Answer this question and get it marked →October–November 2023, Paper 21
The rate of reaction between calcium carbonate and dilute hydrochloric acid is determined either by measuring the change in gas volume per unit time or by measuring the change in…
Answer this question and get it marked →The ionic equation for the reaction between iron(II) chloride and chlorine is 2Fe2+ + Cl2 - 2Fe3+ + 2Cl-. Which row shows the substance that is reduced and the oxidising agent? A…
Answer this question and get it marked →Other IGCSE Sciences - Co-Ordinated topics
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- Organisms and their environment (28)
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- The Periodic Table (22)
- Human nutrition (21)
- Reproduction (21)
- Thermal physics (20)