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2 marksEnergetics

CAPE Chemistry Unit 1 · 2008 · Paper 2 · Question 1(a)(i)

This section covers fundamental chemistry concepts, including enthalpy changes and bonding. The first question focuses on enthalpy of formation and solution, and then explores lattice energies and experimental errors in thermochemistry.

Define the term 'standard enthalpy of formation', ΔHᶠθ.

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  1. 1(a)(ii)The enthalpy of formation of both carbon monoxide and aluminium oxide cannot be determined directly by experimental means. Suggest ONE reason in EACH case for…[2 marks]
  2. 1(b)(i)Write the enthalpy change represented by ΔH₁, ΔH₂ and ΔH₃ in Figure 1. ΔH₁ : ΔH₂ : ΔH₃ :[3 marks]
  3. 1(b)(ii)Calculate the enthalpy of solution for KBr, given the following information. ΔH₁ = + 672 kJ mol⁻¹ ΔH₂ = - 656 kJ mol⁻¹[3 marks]
  4. 1(c)(i)What kind of bonding is present in halides of X?[2 marks]
  5. 1(c)(ii)What kind of bonding is present in halides of Y?[1 mark]
  6. 1(d)(i)Identify THREE errors in the above method.[3 marks]

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