plumiBalanced and ionic equations: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 2.1.2.2 Balanced and ionic equations, 2016–2025, with mark schemes and examiner’s reports where available.
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Q24(b)
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All 22 questions on Balanced and ionic equations, as a list
- June 2025, AS Paper 1, Q24(b) (1 mark): Pentene, C5H10, can undergo complete combustion to produce the same products as the combustion of an alkane. Write the equation for the complete combustion of C
- June 2024, Paper 3, Q4(b)(i) (1 mark): Phosphine reacts with oxygen gas to form phosphorus(V) oxide and water. Write the equation for this reaction. [1]
- June 2024, Paper 3, Q4(c)(i) (1 mark): Write an equation for the reaction of PCl 5 and ammonium chloride to form P3N3Cl 6. [1]
- June 2024, AS Paper 1, Q21(b)(ii) (1 mark): Balance the equation for the reduction of Fe2O3 with carbon monoxide. Fe2O3 + CO Fe + CO2 [1]
- June 2023, AS Paper 2, Q2(b)(i) (2 marks): Write an equation for the formation of barium sulfate in step 2. Include state symbols. [2]
- June 2022, Paper 1, Q21(b)(ii) (1 mark): 10 cm3 of dilute sulfuric acid is added to 10 cm3 of the colourless solution of Ba(OH)2. Write an ionic equation, including state symbols, for the reaction. [1]
- November 2021, Paper 3, Q1(d) (4 marks): Compound A has the following percentage composition by mass: Ca, 81.10%; N, 18.90%. A student reacts compound A with water to form alkaline gas B and alkali C.
- November 2021, AS Paper 1, Q23(c) (1 mark): A mixture of potassium perchlorate, KCl O4, and aluminium is used in fireworks. When the firework ignites, KCl O4 reacts with aluminium to form potassium chlori
- November 2020, Paper 2, Q17(b) (3 marks): Compound C can be prepared by ‘trimerisation’ of propanone using concentrated sulfuric acid as a catalyst. Suggest an equation for this reaction, using molecula
- November 2020, AS Paper 1, Q8 (1 mark): The unbalanced equation for the reaction of copper with concentrated nitric acid is shown below. Cu + HNO3 → Cu(NO3)2 + NO2 + H2O What is the number of moles of
- November 2020, AS Paper 1, Q22(a)(ii) (1 mark): Write the equation for the reaction of phosphorus with bromine. [1]
- November 2020, AS Paper 2, Q3(c)(i) (1 mark): H2Se can be prepared by reacting aluminium selenide, Al 2Se3, with water. Aluminium hydroxide and hydrogen selenide are formed. Write the equation for this reac
- June 2019, Paper 3, Q3(a)(i) (1 mark): Write the equation for the reduction of Pb2O3 with CH4. [1]
- June 2019, AS Paper 1, Q21(d)(ii) (2 marks): Calcium nitride reacts with water to form a solution containing two alkaline compounds. Write an equation for this reaction. [2]
- June 2018, AS Paper 1, Q15 (1 mark): 1 mol of a compound reacts with 8 mol O2 for complete combustion. What is the formula of the compound? A C4H8 B C4H9OH C C5H11OH D C5H12 Your answer [1]
- June 2018, AS Paper 1, Q22(b)(ii) (1 mark): When exposed to air, phosphine spontaneously ignites, forming P4O10 and water. Construct an equation for this reaction. [1]
- June 2018, AS Paper 2, Q2(c)(ii) (2 marks): Sodium selenide reacts with hydrochloric acid to form a toxic gas, B, with a relative molecular mass of 81.0. Identify gas B and write an equation for this reac
- June 2017, Paper 3, Q2(d)(iii) (1 mark): Construct the equation for this reaction. Equation [1]
- June 2017, AS Paper 1, Q24(b)(i) (1 mark): The unbalanced equation for the reaction is shown below. Balance the equation. ……. Al (s) + ……. CH3COOH(aq) → ……. (CH3COO)3Al (aq) + …… H2(g) [1]
- June 2017, AS Paper 2, Q1(c)(ii) (4 marks): Solid barium nitride is reacted with water, forming an alkaline solution A and an alkaline gas B. Identify A and B. Write an equation, including state symbols,
- June 2016, AS Paper 1, Q24(b) (1 mark): Write an ionic equation for the reaction that the student carries out. Include state symbols. [1]
- June 2016, AS Paper 2, Q2(c) (1 mark): Aluminium forms a sulfide, Al2S3. Al2S3 reacts with water to form aluminium hydroxide and hydrogen sulfide, H2S. Write an equation for the reaction of Al2S3 wit
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