Pearson Edexcel As Chemistry Paper 1 2025 Question Paper

Download the official Pearson Edexcel AS Level Chemistry Paper 1 question paper for the June 2025 examination series (8CH0/01). This examiner-authentic PDF contains the complete Core Inorganic and Physical Chemistry assessment used in the live Edexcel AS Chemistry examination.

The paper examines key AS Chemistry topics including atomic structure, ionisation energy, bonding, intermolecular forces, periodicity, redox chemistry, Group 2 chemistry, halide reactions, thermal decomposition, stoichiometry, empirical and molecular formula calculations, and quantitative chemistry. Students are required to apply theoretical knowledge to structured calculations, experimental scenarios, practical observations, and extended-response explanations.

Questions assess understanding of electronegativity, covalent bonding, ionic and metallic bonding, conductivity, hydrogen bonding, molecular polarity, thermal decomposition of magnesium nitrate, Avogadro calculations, isotopic abundance calculations, oxidation numbers, reducing agents, periodic trends, and ionisation-energy patterns across Period 3.

The examination includes structured calculations involving molar volume, isotopic mass determination, hydration calculations, empirical and molecular formula determination, percentage composition, and balanced chemical equations. Students also analyse experimental apparatus, gas collection methods, combustion analysis, and observations from practical chemistry investigations.

Practical and analytical contexts include sodium hydride reactions, magnesium nitrate decomposition, zinc isotope calculations, potassium iodide with concentrated sulfuric acid reactions, and combustion analysis of ferrocene. Students must demonstrate accurate scientific terminology, balanced equations, quantitative reasoning, and logical explanation skills under authentic Edexcel exam conditions.

The extended-response question explores trends in first ionisation energies across Period 3, requiring students to explain general increases and anomalies using nuclear charge, shielding, electron configuration, and subshell theory. This develops high-level analytical writing and synoptic understanding of atomic structure concepts.

This official Edexcel AS Chemistry 8CH0/01 question paper is ideal for timed exam practice, mock examinations, revision planning, classroom assessment, independent study, and preparation for the 2026 AS Chemistry examinations. Pair this paper with the matching Edexcel 8CH0/01 mark scheme on markscheme.net for complete examiner-standard revision and accurate self-assessment.

This document is designed for Pearson Edexcel AS Level Chemistry students studying the 8CH0 specification, especially Year 12 students preparing for the 2026 examination series who want authentic exam practice using official Edexcel assessment materials. It is particularly useful for students aiming to improve calculation accuracy, scientific explanation, equation balancing, analytical reasoning, and application of chemistry theory to experimental and practical contexts.

The paper is also highly valuable for Chemistry teachers, tutors, sixth-form colleges, revision centres, home-schooled learners, and retake candidates who require official Edexcel exam-standard materials for mock examinations, classroom activities, structured revision sessions, homework tasks, and exam-technique preparation. It supports stronger understanding of physical chemistry, inorganic chemistry, periodicity, redox processes, and quantitative chemistry skills.