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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AS
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry

Tuesday 13 May 2025 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
For Examiner’s Use
 the Periodic Table/Data Sheet, provided as an insert (enclosed)
 a ruler with millimetre measurements Question Mark
 a scientific calculator, which you are expected to use where appropriate.
1

Instructions 2
 Use black ink or black ball-point pen. 3
 Fill in the boxes at the top of this page. 4
 Answer all questions.
5
 You must answer the questions in the spaces provided. Do not write outside the box around each page
or on blank pages. 6
 If you need extra space for your answer(s), use the lined pages at the end of this book. Write the 7
question number against your answer(s). Section B
 All working must be shown.
 Do all rough work in this book. Cross through any work you do not want to be marked. TOTAL


Information
 The marks for questions are shown in brackets.
 The maximum mark for this paper is 80.

Advice
 You are advised to spend 65 minutes on Section A and 25 minutes on Section B.




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, 2
Do not write
outside the
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]



6




Turn over for the next question




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There are no questions printed on this page box




DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED




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0 2 This question is about the halogens and their compounds.


0 2 . 1 Table 1 shows the boiling points of some halogens.

Table 1


Halogen Boiling point / °C

Fluorine –188

Chlorine –35

Bromine 59




Explain the trend in the boiling points of these halogens.
[2 marks]




0 2 . 2 Chlorine is toxic but is added to drinking water.

State why chlorine is added to drinking water.

Explain why this is safe to do even though chlorine is toxic.
[2 marks]

Why chlorine is added



Why this is safe




Question 2 continues on the next page




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