AQA As Chemistry Paper 1 2025 Question Paper Pdf

Get the official AQA AS Chemistry Paper 1 question paper from the May 2025 series (7404/1), sat on Tuesday 13 May 2025 (morning). This paper focuses on **Inorganic and Physical Chemistry** and is worth **80 marks over 1 hour 30 minutes**.

The paper covers a wide range of AS-level topics with structured questions and multiple-choice sections:

**Section A (pages 2–17):**
- **Question 1 (pages 2–3):** Titanium extraction, including atom economy calculation, reaction equations (TiO₂ with Cl₂ and C), and role of magnesium as a reducing agent.
- **Question 2 (pages 5–7):** Halogens and their compounds, including trends in boiling points (Table 1), chlorine in water treatment, disproportionation reactions, and redox equations involving NaClO and ClO₃⁻.
- **Question 3 (pages 8–10):** Atomic structure and TOF mass spectrometry, including electron configurations, isotope abundance (Table 2), and calculation of relative atomic mass and ion mass using kinetic energy data.
- **Question 4 (page 11):** Group 2 chemistry, including trends in melting point and atomic radius, reactions with water, and ionisation energy.
- **Question 5 (pages 12–13):** Titration calculations to determine relative molecular mass of an acid (H₂A), including use of concordant titres from Table 3 and percentage uncertainty calculations.
- **Question 6 (pages 14–15):** Qualitative analysis using test-tube reactions (Table 4), requiring identification of ions and writing ionic equations.
- **Question 7 (pages 16–17):** Chemical equilibrium, including concentration-time graphs (Figure 1), Le Chatelier’s principle, and calculation of Kc for methanol synthesis.

For example, the **graph in Figure 1 (page 16)** shows iodine concentration decreasing over time, requiring students to sketch the corresponding increase in hydrogen iodide concentration and explain equilibrium shifts.

**Section B (multiple choice, pages 18–24):**
Includes 15 questions covering:
- Periodicity and ionisation energy trends
- Equilibrium and gas calculations (PV = nRT)
- Structure and bonding (polarity, ionic lattices)
- Organic and inorganic chemistry fundamentals

Examples include:
- Calculating mass of CO gas using ideal gas equation (page 18)
- Identifying polar molecules (page 23)
- Determining equilibrium shifts with pressure (page 22)

This paper is essential for realistic AS-level exam practice, helping you master calculations, data analysis, and core inorganic/physical chemistry concepts required for top grades.

Fully updated for the 2025/2026 academic year and optimised for instant download on markscheme.net.

This paper is ideal for Year 12 students preparing for AQA AS Chemistry exams or Year 13 students revising foundational topics for A-Level Chemistry.

Teachers and tutors use this resource for mock exams, timed practice, and topic-based revision. It is also perfect for independent learners who want authentic exam-style questions from the official AQA paper.