2025 AQA AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry Worked Exam Solutions. Mark Scheme ATTACHED. Tuesday 13 May 2025 [VERIFIED]

2025 AQA AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry
Worked Exam Solutions. Mark Scheme ATTACHED.
Tuesday 13 May 2025 [VERIFIED]

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Section A box



Answer all questions in this section.


0 1 This question is about the extraction of titanium.

The first stage in the extraction of titanium is the formation of titanium(IV)
chloride, TiCl4

TiO2(s) + 2 C(s) + 2 Cl2(g) ⟶ TiCl4(l) + 2 CO(g)


0 1 . 1 Calculate the percentage atom economy to form TiCl4 in this first stage of the extraction.
[2 marks]




Percentage atom economy


0 1 . 2 Suggest one economic advantage of using a process with a high
percentage atom economy.
[1 mark]




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The second stage of the extraction is the reaction between TiCl4 and magnesium. box




0 1 . 3 Give the equation for the reaction between TiCl4 and magnesium. State

the role of magnesium in this reaction.
[2 marks]

Equation




Role of magnesium


0 1 4. Titanium is an expensive metal because its extraction process uses magnesium.

Suggest why magnesium is expensive.
[1 mark]



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