Reactions of acids: AQA GCSE Combined Science questions

Every AQA GCSE Combined Science exam question on 5.4.2 Reactions of acids, 2018–2025, with its mark scheme and examiner’s report.

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3,069 questions

Q05.2
June 2025 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q05.4
June 2025 · Chemistry Paper 1 Higher
2 marks5.4.2 Reactions of acids
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Q05.1
June 2025 · Chemistry Paper 1 Foundation
2 marks5.4.2 Reactions of acids
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Q05.2
June 2025 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
Mark scheme (PDF)
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Q05.3
June 2025 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
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Q05.4
June 2025 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
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Q05.5
June 2025 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
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Q05.7
June 2025 · Chemistry Paper 1 Foundation
2 marks5.4.2 Reactions of acids
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Q05.8
June 2025 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
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Q02.1
June 2024 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q02.2
June 2024 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q02.3
June 2024 · Chemistry Paper 1 Higher
2 marks5.1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes 5.4.2 Reactions of acids
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Q04.1
June 2024 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q04.2
June 2024 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q04.3
June 2024 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q04.4
June 2024 · Chemistry Paper 1 Higher
1 mark5.4.2 Reactions of acids
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Q04.6
June 2024 · Chemistry Paper 1 Higher
1 mark5.3.2 Use of amount of substance in relation to masses of pure substances 5.4.2 Reactions of acids
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Q05.1
June 2024 · Chemistry Paper 1 Foundation
1 mark5.4.1 Reactivity of metals 5.4.2 Reactions of acids
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Q07.1
June 2024 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
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Q07.2
June 2024 · Chemistry Paper 1 Foundation
1 mark5.4.2 Reactions of acids
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All 98 questions on Reactions of acids, as a list

June 2025, Chemistry Paper 1 Higher, Q05.2 (1 mark): A solution of hydrochloric acid has: • a pH of 2.5 • a concentration of H+ ions of 3.16 × 10−3 mol/dm3. What is the concentration of H+ ions in a solution of hy
June 2025, Chemistry Paper 1 Higher, Q05.4 (2 marks): Hydrogen chlorate dissolves in water to form a weak acid. Explain why a weak acid has a higher pH than a strong acid of the same concentration. [2 marks]
June 2025, Chemistry Paper 1 Foundation, Q05.1 (2 marks): The method does not give an accurate volume of alkali needed to react completely with the acid. Suggest two improvements to the method. [2 marks] 1 2
June 2025, Chemistry Paper 1 Foundation, Q05.2 (1 mark): What is the pH of the solution when the universal indicator paper turns green? [1 mark] Tick () one box. 1 5 7 9
June 2025, Chemistry Paper 1 Foundation, Q05.3 (1 mark): What name is given to the reaction between an acid and an alkali? [1 mark] Tick () one box. Combustion Displacement Neutralisation
June 2025, Chemistry Paper 1 Foundation, Q05.4 (1 mark): Which ion do all acids contain? [1 mark] Tick () one box. Cl− H+ Na+
June 2025, Chemistry Paper 1 Foundation, Q05.5 (1 mark): Name the acid that reacts with sodium hydroxide to produce sodium nitrate. [1 mark]
June 2025, Chemistry Paper 1 Foundation, Q05.7 (2 marks): When making a salt solution, excess solid is added to the acid. Draw the apparatus used to separate the excess solid from the salt solution by filtration. The a
June 2025, Chemistry Paper 1 Foundation, Q05.8 (1 mark): Solid X reacts with hydrochloric acid to produce zinc chloride and hydrogen gas. Name solid X. [1 mark]
June 2024, Chemistry Paper 1 Higher, Q02.1 (1 mark): What is the formula of the acid used to prepare copper sulfate? [1 mark] Tick () one box. HCl HNO3 H2SO4
June 2024, Chemistry Paper 1 Higher, Q02.2 (1 mark): Why is excess copper carbonate used in stage 1? [1 mark]
June 2024, Chemistry Paper 1 Higher, Q02.3 (2 marks): Beaker N contained copper sulfate solution. Describe how the student could produce copper sulfate crystals from the copper sulfate solution in beaker N. [2 mark
June 2024, Chemistry Paper 1 Higher, Q04.1 (1 mark): What is meant by a ‘strong acid’? [1 mark]
June 2024, Chemistry Paper 1 Higher, Q04.2 (1 mark): Nitric acid is used as a dilute aqueous solution. What is meant by ‘dilute aqueous solution’? [1 mark]
June 2024, Chemistry Paper 1 Higher, Q04.3 (1 mark): 10 cm3 of a nitric acid solution has a pH of 1 Water is added to the nitric acid solution to change the pH of the nitric acid solution to pH 3 How does the hydr
June 2024, Chemistry Paper 1 Higher, Q04.4 (1 mark): Write the ionic equation for the reaction between an acid and an alkali. [1 mark] + →
June 2024, Chemistry Paper 1 Higher, Q04.6 (1 mark): A student mixed some magnesium carbonate with excess nitric acid. The student then added two drops of universal indicator to the solution. What colour was the s
June 2024, Chemistry Paper 1 Foundation, Q05.1 (1 mark): Magnesium reacts with hydrochloric acid to produce magnesium chloride and a gas. Which gas is produced? [1 mark] Tick () one box. Hydrogen Nitrogen Oxygen
June 2024, Chemistry Paper 1 Foundation, Q07.1 (1 mark): What is the formula of the acid used to prepare copper sulfate? [1 mark] Tick () one box. HCl HNO3 H2SO4
June 2024, Chemistry Paper 1 Foundation, Q07.2 (1 mark): Why is excess copper carbonate used in stage 1? [1 mark]
June 2024, Chemistry Paper 1 Foundation, Q07.3 (2 marks): Beaker N contained copper sulfate solution. Describe how the student could produce copper sulfate crystals from the copper sulfate solution in beaker N. [2 mark
June 2023, Chemistry Paper 1 Higher, Q01.1 (1 mark): Which ion makes the solution acidic? [1 mark]
June 2023, Chemistry Paper 1 Higher, Q01.2 (2 marks): Name an indicator that could be used to test if the solution is acidic. Give the result of the test. [2 marks] Indicator Result
June 2023, Chemistry Paper 1 Higher, Q01.4 (1 mark): Carbon dioxide dissolves in water to form an acidic solution. How does the pH of the solution change as the temperature of the water increases? Use Figure 1. [1
June 2023, Chemistry Paper 1 Higher, Q01.6 (6 marks): Figure 2 shows equipment a student used for an investigation. Figure 2 The student investigated the volume of carbon dioxide produced when different masses of c
June 2023, Chemistry Paper 1 Higher, Q02.1 (1 mark): What type of reaction is this? [1 mark]
June 2023, Chemistry Paper 1 Higher, Q05.5 (4 marks): Sodium chloride solution has a pH of 7 During the electrolysis of sodium chloride solution: • hydrogen gas is produced at the negative electrode • the pH of the
June 2023, Chemistry Paper 1 Higher, Q06.1 (2 marks): Describe how solid magnesium chloride is obtained from the reaction mixture. [2 marks]
June 2023, Chemistry Paper 1 Higher, Q06.2 (2 marks): The reaction between magnesium and hydrochloric acid is a redox reaction. Explain what happens to the magnesium atoms in this reaction. [2 marks]
June 2023, Chemistry Paper 1 Foundation, Q04.3 (1 mark): Copper ions and bromide ions carry the electrical charge through the solution. The formula of a copper ion is Cu2+ The formula of a bromide ion is Br – What is
June 2023, Chemistry Paper 1 Foundation, Q06.1 (1 mark): Which ion makes the solution acidic? [1 mark]
June 2023, Chemistry Paper 1 Foundation, Q06.2 (2 marks): Name an indicator that could be used to test if the solution is acidic. Give the result of the test. [2 marks] Indicator Result
June 2023, Chemistry Paper 1 Foundation, Q06.4 (1 mark): Carbon dioxide dissolves in water to form an acidic solution. How does the pH of the solution change as the temperature of the water increases? Use Figure 14. [
June 2023, Chemistry Paper 1 Foundation, Q06.6 (6 marks): Figure 15 shows equipment a student used for an investigation. Figure 15 The student investigated the volume of carbon dioxide produced when different masses of
June 2023, Chemistry Paper 1 Foundation, Q07.1 (1 mark): What type of reaction is this? [1 mark]
June 2022, Chemistry Paper 1 Higher, Q01.1 (3 marks): Excess copper carbonate is added to sulfuric acid. Give three observations you would make. [3 marks] 1 2 3
June 2022, Chemistry Paper 1 Higher, Q01.2 (1 mark): How can the excess copper carbonate be removed? [1 mark]
June 2022, Chemistry Paper 1 Higher, Q01.3 (1 mark): The pH of the solution changes during the reaction. What is the pH of the solution at the end of the reaction? [1 mark] pH =
June 2022, Chemistry Paper 1 Higher, Q01.4 (1 mark): Copper carbonate and sulfuric acid react to produce copper sulfate. What type of reaction is this? [1 mark]
June 2022, Chemistry Paper 1 Higher, Q01.5 (3 marks): Ammonium nitrate is a salt. Figure 1 shows the maximum mass of ammonium nitrate that can dissolve in 100 cm3 of water at different temperatures. Figure 1 A stud
June 2022, Chemistry Paper 1 Higher, Q06.2 (1 mark): Hydrogen chloride dissolves in water to produce hydrochloric acid. Hydrochloric acid is a strong acid. What is meant by the term strong acid? [1 mark]
June 2022, Chemistry Paper 1 Higher, Q06.3 (2 marks): Describe how magnesium can be used to distinguish between a strong acid and a weak acid of the same concentration. [2 marks]
June 2022, Chemistry Paper 1 Higher, Q06.4 (2 marks): The concentration of hydrochloric acid is increased by a factor of 100 What is the change in pH? [2 marks]
June 2022, Chemistry Paper 1 Foundation, Q02.2 (1 mark): Hydrogen chloride dissolves in water to produce hydrochloric acid. Hydrochloric acid reacts with sodium hydroxide solution. Complete the word equation for the r
June 2022, Chemistry Paper 1 Foundation, Q02.3 (1 mark): In the reaction, 3.65 g of hydrogen chloride reacts with 4.00 g of sodium hydroxide. 1.80 g of water is produced. Calculate the mass of the other product. [1 ma
June 2022, Chemistry Paper 1 Foundation, Q02.4 (1 mark): Figure 5 shows part of the thermometer used to measure the temperature. Figure 5 What is the temperature reading on the thermometer? [1 mark] Temperature = °C
June 2022, Chemistry Paper 1 Foundation, Q02.6 (2 marks): Sodium hydroxide is an alkali. Which two ions are in sodium hydroxide solution? [2 marks] Tick () two boxes. Cl– H+ Na+ O2– OH–
June 2022, Chemistry Paper 1 Foundation, Q05.1 (3 marks): Excess copper carbonate is added to sulfuric acid. Give three observations you would make. [3 marks] 1 2 3
June 2022, Chemistry Paper 1 Foundation, Q05.2 (1 mark): How can the excess copper carbonate be removed? [1 mark]
June 2022, Chemistry Paper 1 Foundation, Q05.3 (1 mark): The pH of the solution changes during the reaction. What is the pH of the solution at the end of the reaction? [1 mark] pH =
June 2022, Chemistry Paper 1 Foundation, Q05.4 (1 mark): Copper carbonate and sulfuric acid react to produce copper sulfate. What type of reaction is this? [1 mark]
June 2022, Chemistry Paper 1 Foundation, Q05.5 (3 marks): Ammonium nitrate is a salt. Figure 13 shows the maximum mass of ammonium nitrate that can dissolve in 100 cm3 of water at different temperatures. Figure 13 A st
November 2021, Chemistry Paper 1 Higher, Q02.1 (1 mark): Give the colour change when nitric acid is added to the mixture of universal indicator and water. [1 mark] Tick () one box. Blue to red Green to purple Green t
November 2021, Chemistry Paper 1 Higher, Q02.2 (1 mark): What happens to the pH of water when nitric acid is added? [1 mark] Tick () one box. Decreases Stays the same Increases
November 2021, Chemistry Paper 1 Higher, Q02.4 (2 marks): Give two observations that would be made when zinc carbonate is added to nitric acid until the zinc carbonate is in excess. [2 marks] 1 2
November 2021, Chemistry Paper 1 Higher, Q02.5 (1 mark): The formula of the zinc ion is Zn2+ The formula of the nitrate ion is NO3– What is the formula for zinc nitrate? [1 mark] Tick () one box. ZnNO3 Zn(NO3)2 Zn2NO
November 2021, Chemistry Paper 1 Higher, Q02.6 (6 marks): Acids react with insoluble metal oxides to produce salts. Plan a method to produce a pure, dry sample of the soluble salt copper chloride from an acid and a met
November 2021, Chemistry Paper 1 Foundation, Q07.1 (1 mark): Give the colour change when nitric acid is added to the mixture of universal indicator and water. [1 mark] Tick () one box. Blue to red Green to purple Green t
November 2021, Chemistry Paper 1 Foundation, Q07.2 (1 mark): What happens to the pH of water when nitric acid is added? [1 mark] Tick () one box. Decreases Stays the same Increases
November 2021, Chemistry Paper 1 Foundation, Q07.4 (2 marks): Give two observations that would be made when zinc carbonate is added to nitric acid until the zinc carbonate is in excess. [2 marks] 1 2
November 2021, Chemistry Paper 1 Foundation, Q07.5 (1 mark): The formula of the zinc ion is Zn2+ The formula of the nitrate ion is NO3– What is the formula for zinc nitrate? [1 mark] Tick () one box. ZnNO3 Zn(NO3)2 Zn2NO
November 2021, Chemistry Paper 1 Foundation, Q07.6 (6 marks): Acids react with insoluble metal oxides to produce salts. Plan a method to produce a pure, dry sample of the soluble salt copper chloride from an acid and a met
November 2020, Chemistry Paper 1 Higher, Q03 (6 marks): Some students investigated the thermal decomposition of metal carbonates. The word equation for the reaction is: metal carbonate → metal oxide + carbon dioxide
November 2020, Chemistry Paper 1 Higher, Q04.1 (2 marks): Complete the equation for the reaction by writing the state symbols. [2 marks] ZnO( ) + 2 HCl( ) → ZnCl2( ) + H2O( )
November 2020, Chemistry Paper 1 Higher, Q04.2 (1 mark): Give one way that the student could speed up the reaction between zinc oxide powder and hydrochloric acid. [1 mark]
November 2020, Chemistry Paper 1 Higher, Q04.3 (1 mark): How could the student know when all the hydrochloric acid has reacted? [1 mark]
November 2020, Chemistry Paper 1 Higher, Q04.4 (1 mark): How could the student obtain zinc chloride solution from the reaction mixture when all the hydrochloric acid has reacted? [1 mark]
November 2020, Chemistry Paper 1 Higher, Q04.5 (2 marks): Describe how zinc chloride crystals are produced from zinc chloride solution. [2 marks]
November 2020, Chemistry Paper 1 Higher, Q04.6 (2 marks): Sulfuric acid is gradually added to sodium hydroxide solution. The pH of the mixture changes as the sulfuric acid is added until in excess. Suggest the pH at: •
November 2020, Chemistry Paper 1 Higher, Q04.7 (2 marks): Complete the symbol equation for the preparation of sodium sulfate. You should balance the equation. [2 marks] NaOH + H2SO4 → +
November 2020, Chemistry Paper 1 Higher, Q04.8 (1 mark): A solution of hydrochloric acid had a hydrogen ion concentration of 1.0 mol/dm3 Water was added to the hydrochloric acid until the pH increased by 1 What was th
November 2020, Chemistry Paper 1 Foundation, Q01.1 (1 mark): What is the pH of sulfuric acid? [1 mark] Tick () one box. 1 7 14
November 2020, Chemistry Paper 1 Foundation, Q01.2 (1 mark): An acid reacts with zinc to produce zinc chloride and hydrogen. Which acid reacts with zinc to produce zinc chloride? [1 mark] Tick () one box. Hydrochloric ac
November 2020, Chemistry Paper 1 Foundation, Q01.3 (1 mark): What type of substance is zinc chloride? [1 mark] Tick () one box. Alkali Base Salt
November 2020, Chemistry Paper 1 Foundation, Q01.4 (1 mark): An alkali is a base in solution. Which compound is an alkali? [1 mark] Tick () one box. Sodium hydroxide Sodium nitrate Sodium sulfate
November 2020, Chemistry Paper 1 Foundation, Q01.6 (1 mark): The reaction between the acid and copper oxide is very slow at room temperature. How could the student speed up the reaction? [1 mark]
November 2020, Chemistry Paper 1 Foundation, Q01.7 (1 mark): Complete the sentence to show how the student makes sure that all the acid reacts. Choose the answer from the box. [1 mark] in excess in solution molten soluble
November 2020, Chemistry Paper 1 Foundation, Q01.8 (1 mark): The student filters the unreacted copper oxide from the solution. Which apparatus does the student use? [1 mark] Tick () one box.
November 2020, Chemistry Paper 1 Foundation, Q01.9 (1 mark): What process is used to produce crystals of a salt from a salt solution? [1 mark]
November 2020, Chemistry Paper 1 Foundation, Q08 (6 marks): Some students investigated the thermal decomposition of metal carbonates. The word equation for the reaction is: metal carbonate → metal oxide + carbon dioxide
June 2019, Chemistry Paper 1 Higher, Q02.2 (1 mark): What is the formula of nitric acid? [1 mark] Tick () one box. HCl HNO3 H2SO4 NH4OH
June 2019, Chemistry Paper 1 Higher, Q02.3 (2 marks): Ammonia gas dissolves in water to produce ammonia solution. Ammonia solution contains hydroxide ions, OH– A student adds universal indicator to solutions of nit
June 2019, Chemistry Paper 1 Higher, Q02.4 (1 mark): The student gradually added nitric acid to ammonia solution. Which row, A, B, C or D, shows the change in pH as the nitric acid is added until in excess? [1 mar
June 2019, Chemistry Paper 1 Foundation, Q02.1 (1 mark): Which acid should the student use? [1 mark] Tick () one box. Hydrochloric acid Nitric acid Sulfuric acid
June 2019, Chemistry Paper 1 Foundation, Q02.2 (1 mark): Suggest how the student would know that excess copper oxide has been added. [1 mark]
June 2019, Chemistry Paper 1 Foundation, Q02.3 (2 marks): There are four more stages, A, B, C and D, to make copper chloride crystals. The stages A, B, C and D are not in the correct order. Stage A Partially evaporate
June 2019, Chemistry Paper 1 Foundation, Q07.2 (1 mark): What is the formula of nitric acid? [1 mark] Tick () one box. HCl HNO3 H2SO4 NH4OH
June 2019, Chemistry Paper 1 Foundation, Q07.3 (2 marks): Ammonia gas dissolves in water to produce ammonia solution. Ammonia solution contains hydroxide ions, OH– A student adds universal indicator to solutions of nit
June 2019, Chemistry Paper 1 Foundation, Q07.4 (1 mark): The student gradually added nitric acid to ammonia solution. Which row, A, B, C or D, shows the change in pH as the nitric acid is added until in excess? [1 mar
June 2018, Chemistry Paper 1 Higher, Q03 (6 marks): A student plans a method to prepare pure crystals of copper sulfate. The student’s method is: 1. Add one spatula of calcium carbonate to dilute hydrochloric aci
June 2018, Chemistry Paper 1 Higher, Q07.1 (6 marks): Identify the solids A, B, C and D. Explain your answers. [6 marks]
June 2018, Chemistry Paper 1 Higher, Q07.2 (2 marks): 10 cm3 of solution B is added to a beaker. Distilled water is added to the beaker until the final volume in the beaker is 1000 cm3 The pH of the solution is mea
June 2018, Chemistry Paper 1 Higher, Q08.1 (1 mark): Name the other product. [1 mark]
June 2018, Chemistry Paper 1 Foundation, Q03.1 (1 mark): Which ion is found in all acids? [1 mark] Tick one box. Cl– H+ Na+ OH–
June 2018, Chemistry Paper 1 Foundation, Q03.2 (2 marks): Zinc nitrate can be produced by reacting an acid and a metal oxide. Name the acid and the metal oxide used to produce zinc nitrate. [2 marks] Acid Metal oxide
June 2018, Chemistry Paper 1 Foundation, Q03.4 (1 mark): The pH of a solution is 8 Some hydrochloric acid is added to the solution. Suggest the pH of the solution after mixing. [1 mark] pH =
June 2018, Chemistry Paper 1 Foundation, Q03.5 (4 marks): Table 2 shows the solubility of three solids in water at room temperature. Table 2 Solid The mass of the solid that dissolves in 100 cm3 of water Phosphorus oxi
June 2018, Chemistry Paper 1 Foundation, Q07 (6 marks): A student plans a method to prepare pure crystals of copper sulfate. The student’s method is: 1. Add one spatula of calcium carbonate to dilute hydrochloric aci

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