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Entropy and the direction of change: Edexcel International A Level Chemistry questions

Edexcel International A Level Chemistry past-paper questions on 12.A.1 Entropy and the direction of change, 2019–2025, with mark schemes and examiner’s reports where available.

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  1. Q3

    June 2025 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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  2. Q14

    January 2025 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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  3. Q5

    January 2023 · Unit 4

    1 mark12.A.1 Entropy and the direction of change12.A.2 Entropy changes in changes of state, dissolving and reactions
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  4. Q5

    October 2022 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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  5. Q14

    June 2022 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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  6. Q5

    October 2021 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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  7. Q1

    June 2021 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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  8. Q20(c)

    June 2021 · Unit 4

    3 marks12.A.1 Entropy and the direction of change12.A.2 Entropy changes in changes of state, dissolving and reactions
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  9. Q1

    January 2021 · Unit 4

    1 mark12.A.1 Entropy and the direction of change
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All 9 questions on Entropy and the direction of change, as a list
  1. June 2025, Unit 4, Q3 (1 mark): Which of these substances would be expected to have the greatest standard molar entropy? A FeO B FeS C FeCl2 D FeCl3
  2. January 2025, Unit 4, Q14 (1 mark): Which has the greatest molar entropy? A Hg(l) B H2O(l) C NO(g) D NO2(g)
  3. January 2023, Unit 4, Q5 (1 mark): Two flasks, P and Q, are connected by a tube fitted with a tap. P Q Flask P contains argon gas and flask Q is in vacuum. Assume argon behaves as an ideal gas an
  4. October 2022, Unit 4, Q5 (1 mark): Which sequence shows the elements in order of increasing standard entropy? A He(g) < O2(g) < Hg(l) < Os(s) B O2(g) < He(g) < Hg(l) < Os(s) C Os(s) < Hg(l) < He(
  5. June 2022, Unit 4, Q14 (1 mark): In which series does the standard molar entropy of the compounds increase? A CaO(s) < H2O(l) < CO2(g) < SO2(g) B CaO(s) < H2O(l) < SO2(g) < CO2(g) C SO2(g) < CO
  6. October 2021, Unit 4, Q5 (1 mark): The standard molar entropy, S , of a substance A is not affected by changes of state or changes in temperature B only changes when the temperature changes C onl
  7. June 2021, Unit 4, Q1 (1 mark): Which of these gases would have the greatest standard molar entropy? A NH3 B H2 C N2 D SO2
  8. June 2021, Unit 4, Q20(c) (3 marks): Draw a sketch of entropy against temperature for water to illustrate the entropy changes as temperature increases, including when water changes state. A scale i
  9. January 2021, Unit 4, Q1 (1 mark): Which of these has the highest standard molar entropy at 298 K and 1 atm pressure? A carbon dioxide, CO2 B copper, Cu C ethanol, C2H5OH D hydrogen, H2

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