AQA A Level Chemistry Paper 3 2025 Question Paper Pdf

Get the official AQA A-Level Chemistry Paper 3 question paper from the June 2025 series (7405/3). This is the synoptic paper combining **Physical, Organic, and Inorganic Chemistry**, with practical skills and multiple-choice questions, designed to test full A-Level understanding.

**Section A (pages 1–17)** focuses on structured and practical-based questions:
- **Question 1 (pages 1–3):** Calorimetry and Hess’s Law, including enthalpy of solution calculations for potassium hydroxide using experimental data (Table 1 shows temperature change from 18.1°C to 30.4°C).
- **Question 2 (pages 4–7):** Kinetics investigation of the iodine–thiosulfate reaction, requiring analysis of rate data (Table 3), determination of reaction orders, rate equation, and uncertainty evaluation.
- **Question 3 (pages 8–10):** Electrochemistry, including identification of errors in a standard electrode setup (Figure 1), EMF concepts, and redox reactions involving Fe²⁺/Fe³⁺ and Cu²⁺/Cu systems.
- **Question 4 (pages 11–12):** Equilibrium and Kc calculations involving Fe³⁺ and I⁻ reactions, including titration data and unit determination.
- **Question 5 (pages 13–15):** Organic oxidation, requiring identification of primary vs secondary alcohols, oxidation methods, chemical tests, and IR spectroscopy confirmation.
- **Question 6 (pages 16–17):** Organic chemistry of esters and stereochemistry using triglyceride structures (Figure 2), including E/Z isomerism and hydrolysis reactions.

**Section B (pages 18–20)** contains multiple-choice questions testing a wide range of topics:
- Organic chemistry mechanisms and functional groups
- Inorganic chemistry (periodicity and p-block elements)
- Physical chemistry including bonding, energetics, and equilibrium
- Industrial chemistry such as cracking and fuel composition

For example:
- Page 18 includes a question on quaternary ammonium salts formed from amines and haloalkanes.
- Page 19 tests knowledge of crude oil fractions and cracking processes.
- Page 20 includes bonding and shape questions such as identifying tetrahedral species.

This paper is highly synoptic, requiring students to link concepts across the entire A-Level Chemistry course while demonstrating strong problem-solving, calculation, and evaluation skills.

This resource is essential for realistic exam practice, helping you master synoptic thinking, practical chemistry skills, and multiple-choice techniques required for top grades. Pair it with the official mark scheme for full examiner-standard revision. Fully updated for the 2025/2026 academic year and optimised for instant download on markscheme.net.

This paper is essential for Year 13 students preparing for the 2026 AQA A-Level Chemistry exams, particularly those aiming to master Paper 3, which tests synoptic understanding across all topics.

Teachers and tutors use this paper for mock exams, structured revision, and practical skills assessment. It is also ideal for independent learners and retake students who want full exam-style practice across the entire A-Level specification.