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International ASChemistryEdexcelExam Questions2. Energetics, Group Chemistry, Halogenoalkanes & AlcoholsEnergetics

Energetics (Edexcel International AS Chemistry): Exam Questions

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11 mark

Which are correct for the reaction shown?

CH3COOH + KOH → CH3COO−K++ H2O        ΔH = –55.8 kJ mol−1

 

 

Type of reaction

Type of enthalpy change

☐

A

endothermic

formation

☐

B

endothermic

neutralisation

☐

C

exothermic

formation

☐

D

exothermic

neutralisation

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    21 mark

    Which is the correctly labelled reaction profile for an exothermic reaction?

    q1-paper-2-june-2021-edexcel-ial-chemistry

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      31 mark

      The energy profile for a reaction is shown.

      q1-paper-2-jan-2021-edexcel-ial-chemistry

      What is the minimum energy needed for this reaction to occur?

      • X

      • Y

      • X − Y

      • X + Y

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      41 mark

      Which equation does not represent a standard enthalpy change of atomisation?

      • Mg (s) → Mg (g)

      • Cl2 (g) → 2Cl (g)

      • 1⁄2O2 (g) → O (g)

      • Hg (l) → Hg (g)

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      51 mark

      Which equation represents the standard enthalpy change of atomisation, ΔatH, of bromine?

      • 1⁄2 Br2 (l) → Br (g)

      • Br2 (l) → 2Br (g)

      • 1⁄2 Br2 (g) → Br (g)

      • Br2 (g) → 2Br (g)

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      11 mark

      The equation for a reaction is

      2C (s) + O2 (g) → 2CO (g)

      Which is the correct symbol for the enthalpy change for this reaction?

      • ΔatH

      • ΔcH

      • ΔfH

      • ΔrH

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      2
      Sme Calculator      1 mark

      5.20 g of sodium hydrogencarbonate is added to an excess of acid.

      The temperature increases and the energy change is calculated to be 1030 J.

      What is the enthalpy change per mole of sodium hydrogencarbonate?

      [Mr NaHCO3 = 84.0]

      • –12.3 kJ mol−1

      • –16.6 kJ mol−1

      • –63.8 kJ mol−1

      • –16600 kJ mol−1

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      3
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      The equation for the complete combustion of methanal is shown.

      q4-paper-2-jan-2022-edexcel-ial-chemistry

      Some bond enthalpy data are shown.

      Bond

      Bond enthalpy / kJ mol−1

      C—H

      413

      OequalsO

      498

      CequalsO in CO2

      805

      O—H

      464

      What is the CequalsO bond enthalpy in methanal?

      • 623 kJ mol−1

      • 678 kJ mol−1

      • 805 kJ mol−1

      • 1036 kJ mol−1

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      4
      Sme Calculator      1 mark

      The table shows the amount of energy released per gram when some alkanes are burned in excess oxygen under standard conditions.

      Alkane

      Energy released / kJ g−1

      methane

      55.6

      ethane

      52.0

      propane

      50.4

      butane

      49.6

      Which alkane has a standard enthalpy change of combustion of −2877 kJ mol−1?

      • methane

      • ethane

      • propane

      • butane

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      5
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      The enthalpy changes for two reactions are shown.

      H+ (aq) + OH− (aq) → H2O (l)                    ΔrH = −57.2 kJ mol−1

      CH3COOH (aq) + OH− (aq) → CH3COO− (aq) + H2O (l)     ΔrH = −56.0 kJ mol−1

      What is the enthalpy change for the dissociation of CH3COOH (aq) into CH3COO− (aq) and H+ (aq) ions, in kJ mol−1?

      • +113.2

      • +1.2

      • −1.2

      • −113.2

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