From Paper 1: Advanced Inorganic and Physical Chemistry
7(a)4 marks
Calculate the lattice energy of magnesium oxide.
ΔfH(MgO) −602; atomisation Mg +148; 1st IE Mg +738; 2nd IE Mg +1451; atomisation O +249; 1st EA O −141; 2nd EA O +798 (all kJ mol⁻¹).
From Paper 1: Advanced Inorganic and Physical Chemistry
7(b)2 marks
Explain why the second electron affinity of oxygen is endothermic.
From Paper 1: Advanced Inorganic and Physical Chemistry
7(c)4 marks
For CaCO₃(s) → CaO(s) + CO₂(g), ΔH = +178 kJ mol⁻¹ and ΔS(system) = +161 J K⁻¹ mol⁻¹. Calculate ΔS(surroundings) at 298 K and ΔS(total), and state whether the reaction is feasible at 298 K.
From Paper 3: General and Practical Principles in Chemistry
5(a)6 marks
Methanol is made from CO and H₂: CO(g) + 2H₂(g) ⇌ CH₃OH(g), ΔH = −91 kJ mol⁻¹. Discuss the choice of conditions (about 250 °C, 50–100 atm, copper-based catalyst) in terms of yield, rate, cost and safety.
From Paper 3: General and Practical Principles in Chemistry
7(a)5 marks
For N₂O₄(g) → 2NO₂(g), ΔH = +58 kJ mol⁻¹ and ΔS(system) = +176 J K⁻¹ mol⁻¹. Calculate the temperature above which the reaction is feasible and explain why a gas-phase dissociation has a positive entropy change.
From Paper 3: General and Practical Principles in Chemistry
9*6 marks
Discuss how the type of bonding affects the physical properties of sodium chloride, magnesium, silicon dioxide and iodine.
Score 0 / 27 · 0 of 6 marked
This paper is written by Plasmo in the style of the Edexcel A-Level Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.
Energetics II Exam Questions: Edexcel A-Level Chemistry | Plasmo