Lesson 8.1.2

8.1.2 Measuring enthalpy changes Quiz: Pearson Edexcel Chemistry, Unit 8

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 8.1.2, Measuring enthalpy changes: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 8: Energetics I, written with Revision Ninja.

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The 20 questions

  1. What is the expression used to calculate the energy transferred to a known mass of water in an enthalpy experiment?

    • q = m x c x delta T
    • q = c x delta T / m
    • q = m / c x delta T
    • q = m x c / delta T

  2. What is the specific heat capacity of water usually taken to be in calorimetry calculations?

    • 41.8 J g-1 K-1
    • 0.418 J g-1 K-1
    • 2.10 J g-1 K-1
    • 4.18 J g-1 K-1

  3. 50.0 g of water is heated by 12.0 K in an experiment. How much energy is transferred to the water, using c = 4.18 J g-1 K-1?

    • 0.502 kJ
    • 25.1 kJ
    • 2.51 kJ
    • 2508 kJ

  4. In a spirit burner experiment, 2.00 g of ethanol (Mr = 46.0) heats 100 g of water by 10.0 K. What is the enthalpy of combustion of ethanol, in kJ mol-1?

    • -191 kJ mol-1
    • -9.61 kJ mol-1
    • -96.1 kJ mol-1
    • -4.18 kJ mol-1

  5. What is the main reason experimental alcohol combustion enthalpies are less exothermic than theoretical values?

    • High atmospheric pressure
    • Overheating the water
    • Using excess oxygen
    • Heat loss

  6. In a neutralisation experiment, 25.0 cm3 of 1.00 mol dm-3 HCl is mixed with 25.0 cm3 of 1.00 mol dm-3 NaOH. The temperature rises by 6.0 K. What is the enthalpy of neutralisation? Assume the solution has mass 50.0 g and c = 4.18 J g-1 K-1.

    • -100 kJ mol-1
    • -50.2 kJ mol-1
    • -1.25 kJ mol-1
    • +50.2 kJ mol-1

  7. What sign must be given to an enthalpy change value for an endothermic reaction?

    • Neutral
    • Positive
    • Zero
    • Negative

  8. Which change reduces the percentage uncertainty in measuring a temperature change during calorimetry?

    • Smaller water mass
    • Larger beaker volume
    • Larger temperature change
    • Smaller temperature change

  9. What effect does using an unlidded polystyrene cup have on the measured temperature change in calorimetry?

    • Lower than expected
    • Higher than expected
    • Zero
    • Unchanged

  10. Which law is used to calculate an enthalpy change that cannot be measured directly?

    • Hess's law
    • Le Chatelier's law
    • Henry's law
    • Avogadro's law

  11. If the temperature of the solution decreases during a reaction, what type of process has occurred?

    • Isothermal
    • Exothermic
    • Endothermic
    • Adiabatic

  12. What standard density value for water in g cm-3 is assumed during simple calorimetry calculations?

    • 1.00 g cm-3
    • 0.10 g cm-3
    • 10.0 g cm-3
    • 100 g cm-3

  13. What is the main purpose of using polystyrene cups in simple calorimetry experiments?

    • Increase surface area
    • Reduce heat loss
    • Increase reaction rate
    • Prevent chemical reaction

  14. What is the sign and value of the enthalpy change if 0.0100 mol of a substance releases 0.5 kJ of heat?

    • -50 kJ mol-1
    • +0.5 kJ mol-1
    • +50 kJ mol-1
    • -5.0 kJ mol-1

  15. A reaction releases 1.26 kJ of heat when 0.0250 mol of a reagent reacts. What is the enthalpy change in kJ mol-1?

    • +50.4 kJ mol-1
    • -1.26 kJ mol-1
    • -31.5 kJ mol-1
    • -50.4 kJ mol-1

  16. What are the standard units for specific heat capacity in the calorimetry equation q = mcΔT?

    • J K-1
    • J g-1 K-1
    • J mol-1
    • kJ K-1

  17. What quantity is divided into the energy transferred to calculate the enthalpy change per mole?

    • Mass of solution
    • Temperature change
    • Specific heat capacity
    • Moles of reactant

  18. In a cooling curve graph for calorimetry, why is the line extrapolated back to the mixing time?

    • Correct heat loss
    • Determine activation energy
    • Calculate reaction rate
    • Measure total mass

  19. What apparatus limitation causes uncertainty in calorimetry temperature measurements?

    • Burette length
    • Pipette size
    • Balance precision
    • Thermometer resolution

  20. Which formula calculates heat energy transferred to water during calorimetry?

    • q = m/cΔT
    • q = mcΔT
    • q = c/mΔT
    • q = nΔH

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