This question is about lattice enthalpies - AQA - A-Level Chemistry - Question 1 - 2018 - Paper 1
Question 1
This question is about lattice enthalpies.
Figure 1 shows a Born-Haber cycle for the formation of magnesium oxide.
Complete Figure 1 by writing the missing symbols... show full transcript
Worked Solution & Example Answer:This question is about lattice enthalpies - AQA - A-Level Chemistry - Question 1 - 2018 - Paper 1
Step 1
Mg(g) → Mg²⁺(g) + 2e⁻
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Answer
The energy level represents the ionization of magnesium, which requires energy to remove two electrons.
Step 2
O(g) + 2e⁻ → O²⁻(g)
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Answer
This step shows the addition of electrons to oxygen, resulting in the formation of an oxide ion.
Step 3
Mg(g) + 1/2 O2(g) → MgO(s)
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Answer
The final step represents the formation of solid magnesium oxide from gaseous magnesium and oxygen.
