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Pearson Edexcel · GCSE · Chemistry
3 Chemical changes Topical Past Papers
Pearson Edexcel GCSE Chemistry past-paper questions on "Chemical changes" grouped from the official 2026 Edexcel specification. Free to browse.
Pearson Edexcel GCSE Chemistry topical past papers — Topic: Chemical changes — free, no signup. Original Chemistry past papers and mark schemes from the official source, compiled for you. This free archive covers 31 past-paper components — questions grouped by topic, mark scheme alongside, no worked solutions. Free to browse online — no signup, no download limits.
What's in your Topic: Chemical changes
Edexcel GCSE Chemistry topical past papers for the scope you picked — Topic: Chemical changes. Every past-paper question is reproduced with the original wording and paired with the official mark scheme — questions only, no worked solutions on this free archive.
Questions are organised so you can revise systematically without opening a dozen separate session PDFs. If you want step-by-step worked solutions to the same questions, the Topical Solved version is one click away.
How the free Chemistry archive works
Open this page and every Edexcel GCSE Chemistry question on the topic is already grouped for you under the official 2026 syllabus numbering — no signup, no download, nothing to buy. Read them in your browser on any device.
Each question sits next to its official mark scheme, so you can attempt it and mark yourself straight away. When you want the full method walked through, the Topical Solved version of the same questions adds a step-by-step worked solution to every one.
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Always current, always free
Edexcel releases new Chemistry sessions every year, and every session adds new questions to this topical archive. As soon as a session lands, the new questions are filed under the right syllabus topic on this page — so the day after a results day the topic already includes the freshest questions. No stale archive, no waiting.
When Edexcel updates the Chemistry syllabus mapping or retires a topic, the affected topic pages here are re-checked against the official 2026 syllabus and re-grouped — still free to browse. Stale topic mapping is one of the biggest hidden quality problems with free past-paper sites; this archive is re-checked on every release.
Chemistry topical past papers — what students search for
Students search for "Chemistry topical past papers", "Chemistry topic-wise questions", "Chemistry chapter-wise past papers", "Chemistry questions by topic", "free Edexcel Chemistry past papers by topic", and dozens more variations every day. This free page is the canonical landing spot for every topic-wise variant of Chemistry — open the topic you need and the questions are right there.
Common searches — "Chemistry 2026 paper", "Chemistry recent past papers", "Chemistry latest questions by topic" — all resolve to questions grouped under their official syllabus topic here, free to browse.
Some students search specifically for "Chemistry questions only no solutions" or "Chemistry past papers without answers" — that is exactly what this free archive is. If you actually want "Chemistry worked solutions" or "Chemistry step-by-step", the Topical Solved version has the same questions with a teacher-verified worked solution for each.
Subtopics within Chemical changes
Recall that acids in solution are sources of hydrogen ions and
Recall that a neutral solution has a pH of 7 and that acidic
Recall the effect of acids and alkalis on indicators, including
Recall that the higher the concentration of hydrogen ions
Recall that as hydrogen ion concentration in a solution
Core Practical: Investigate the change in pH on adding
Explain the terms dilute and concentrated, with respect
Explain the terms weak and strong acids, with respect to
Recall that a base is any substance that reacts with an acid to
Recall that alkalis are soluble bases
Explain the general reactions of aqueous solutions of acids with:
Describe the chemical test for:
Describe a neutralisation reaction as a reaction between an acid
Explain an acid-alkali neutralisation as a reaction in which
Explain why, if soluble salts are prepared from an acid and an
Explain why, if soluble salts are prepared from an acid and a
Core Practical: Investigate the preparation of pure, dry
Describe how to carry out an acid-alkali titration, using burette
Recall the general rules which describe the solubility of common
Predict, using solubility rules, whether or not a precipitate will
Describe the method used to prepare a pure, dry sample of an
Recall that electrolytes are ionic compounds in the molten state
Describe electrolysis as a process in which electrical energy
Explain the movement of ions during electrolysis, in which:
Explain the formation of the products in the electrolysis, using
Predict the products of electrolysis of other binary, ionic
Write half equations for reactions occurring at the anode
Explain oxidation and reduction in terms of loss or gain
Recall that reduction occurs at the cathode and that
Explain the formation of the products in the electrolysis of
Core Practical: Investigate the electrolysis of copper sulfate
Frequently Asked Questions
Is this Chemistry topical archive really free?
Yes. Every Edexcel Chemistry past-paper question grouped by topic on this page is free to browse online — no signup, no paywall, no download limit. The only paid option is Topical Solved, which adds a step-by-step worked solution to each question.
What's the difference between this and Topical Solved?
This free archive gives you the questions grouped by topic with the official mark scheme alongside — questions only. Topical Solved is the same questions plus a teacher-verified, step-by-step worked solution for each one, so you can see exactly how the marks are earned.
Is the mark scheme included?
Yes — every question is shown next to its official mark scheme, so you can attempt it and mark your own answer without leaving the page.
How up to date is the Chemistry archive?
As soon as Edexcel releases a new Chemistry session, the new questions are filed under the right syllabus topic here — so the archive already includes the freshest session the day after results day, still free.