Pearson Edexcel GCSE Combined Science Paper 2 Higher 2025 Ms

Download the official Pearson Edexcel GCSE (9–1) Combined Science Paper 2 Chemistry Higher Tier mark scheme from the Summer 2025 examination series (1SC0/1CH). This authentic examiner-issued Chemistry mark scheme contains official answers, accepted alternative responses, examiner guidance, calculation methods, practical-investigation marking criteria, indicative content, and level-based descriptors used by Pearson Edexcel examiners during the marking of the June 2025 GCSE Combined Science Higher Tier Chemistry examination.

This Higher Tier Chemistry mark scheme is ideal for students preparing for the 2026 GCSE Combined Science examinations, teachers conducting mock assessments, tutors improving exam technique, intervention programmes, homeschooling learners, and independent students who want to understand exactly how marks are awarded in Pearson Edexcel Chemistry papers.

The mark scheme includes detailed examiner guidance for Chemistry topics including subatomic particles, isotopes, ionic compounds, electrolysis, electronic configuration, intermolecular forces, boiling points, fractional distillation, thermal decomposition, equilibrium, the Haber process, electrolysis of magnesium sulfate, percentage mass calculations, Avogadro constant calculations, and decomposition of ammonium chloride.

Extended-response questions include official indicative content and level-based descriptors explaining how students are assessed on electrolysis reactions, oxidation and reduction, movement of ions, equilibrium shifts, and industrial ammonia production using scientific explanations and ionic equations.

This official Pearson Edexcel GCSE Combined Science Higher Tier Chemistry mark scheme is designed for Year 10 and Year 11 students preparing for Summer 2026 GCSE examinations, Higher Tier Combined Science learners improving Chemistry exam performance, GCSE resit candidates, and independent learners studying the Pearson Edexcel Combined Science specification.

It is also highly valuable for Chemistry teachers, science departments, tutors, revision academies, intervention coordinators, homeschooling parents, and classroom assessors who require examiner-standard answers, accepted alternative responses, official mark allocation criteria, and authentic Pearson Edexcel assessment guidance.