plumiEvidence for ions and how they form: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 3.A.1 Evidence for ions and how they form, 2019–2025, with mark schemes and examiner’s reports where available.
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Q23(a)(iii)
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All 22 questions on Evidence for ions and how they form, as a list
- June 2025, AS Unit 1, Q23(a)(iii) (2 marks): Sodium and oxygen react to form sodium oxide, which is also ionic. Draw the dot-and-cross diagram showing the ions present in sodium oxide. (2)
- June 2025, AS Unit 3, Q3(a) (3 marks): Explain what the experiment tells us about the structure of silver nitrate and potassium chromate(VI), including an equation for the reaction which occurs. Stat
- June 2025, AS Unit 3, Q3(b)(i) (1 mark): The filter paper was soaked in tap water prior to the experiment and then gently shaken to remove excess water before use. Suggest the reason that deionised or
- June 2025, AS Unit 3, Q3(c) (2 marks): The experiment was repeated but this time using a spot of copper(II) chromate(VI) in the centre of the filter paper, as shown. + – The central spot of copper(II
- October 2024, AS Unit 1, Q11 (1 mark): Which row of the table shows properties consistent with the type of bonding shown? Electrical conductivity Bonding Solubility in water Melting temperature of so
- January 2024, AS Unit 1, Q20(b)(i) (2 marks): Draw a dot‑and‑cross diagram to show the bonding in magnesium oxide, MgO. Show outer electrons only. (2)
- January 2024, AS Unit 1, Q20(c) (2 marks): The table gives some data about the electrical conductivity of magnesium and magnesium oxide. Electrical conductivity State Magnesium Magnesium oxide solid high
- October 2023, AS Unit 1, Q3(a) (1 mark): What is the formula of the carbide ion? (1) A C2 – B C2 + C C2 2– D C2 2+
- October 2023, AS Unit 1, Q4 (1 mark): Which diagram best represents the electron density map of sodium chloride? A B C D Use this space for any rough working. Anything you write in this space will g
- October 2023, AS Unit 1, Q7 (1 mark): A direct electrical current was passed through a green solution of copper(II) chromate(VI) in the apparatus shown. Negative electrode Positive electrode Copper(
- January 2023, AS Unit 1, Q24(b)(ii) (3 marks): Explain how the electrical conductivity of sodium fluoride provides evidence for the existence of ions. (3)
- October 2022, AS Unit 1, Q14(b)(i) (2 marks): Draw a dot‑and‑cross diagram for barium chloride. Show the outer electrons only. (2)
- October 2022, AS Unit 1, Q14(c) (1 mark): Give a reason why solid barium chloride does not conduct electricity. (1)
- June 2022, AS Unit 1, Q11(b) (1 mark): Which substance has properties showing that it changes from a molecular structure to ions when it dissolves in water? (1) A L B M C P D Q
- January 2022, AS Unit 1, Q1(a) (1 mark): What is the formula of the compound formed from X and Y? (1) A XY B X2Y C XY2 D X2Y2
- January 2022, AS Unit 1, Q1(b) (1 mark): Under what conditions does the compound formed from X and Y conduct electricity? (1) A in the solid state and in the liquid state and in aqueous solution B in t
- January 2022, AS Unit 1, Q3 (1 mark): A drop of an aqueous solution of green copper(II) chromate(VI) is placed in the centre of a strip of damp filter paper. The ends of the filter paper are connect
- October 2021, AS Unit 1, Q12(e) (2 marks): Anhydrous calcium chloride is a crystalline, ionic solid which melts at 772 °C. Draw a dot-and-cross diagram for calcium chloride. Show the outer electrons only
- January 2020, AS Unit 1, Q19(c)(i) (3 marks): Draw a dot-and-cross diagram to show the bonding in aluminium oxide. Show outer shell electrons only. (3)
- January 2020, AS Unit 1, Q19(c)(ii) (1 mark): Give a reason why aluminium oxide must be in the liquid state before electrolysis can occur. (1)
- June 2019, AS Unit 1, Q1 (1 mark): Which statement is not true for sodium chloride? A sodium chloride conducts electricity in aqueous solution B sodium chloride conducts electricity when molten C
- January 2019, AS Unit 1, Q7 (1 mark): Which is the dot-and-cross diagram for magnesium chloride? Only outer shell electrons are shown. A Cl Mg B Cl Cl Mg + − C Cl Mg − 2+ − D Cl Mg Cl
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