2025 AQA AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry Final Marking Scheme
Please write clearly in block capitals.
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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:
the Periodic Table/Data Sheet, provided as an insert (enclosed) For Examiner’s Use
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 7
this book. Write the 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 TOTAL
want to be marked.
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.
7404/1
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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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, 3
Do not write
outside the
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
Turn over ►
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IB/M/Jun25/7404/1
, 4
Do not write
outside the
There are no questions printed on this page box
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
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IB/M/Jun25/7404/1
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
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:
the Periodic Table/Data Sheet, provided as an insert (enclosed) For Examiner’s Use
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 7
this book. Write the 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 TOTAL
want to be marked.
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.
7404/1
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/G4002/V6
, 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]
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/7404/1
, 3
Do not write
outside the
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
Turn over ►
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/7404/1
, 4
Do not write
outside the
There are no questions printed on this page box
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/7404/1
