Edexcel IGCSE Science(Double Award)-Chemistry (4wsd0-1c)

States of matter

12 worked examples and 12 model answers. Every link opens the solution on the Learning Portal.

States of Matter

Study notes →

Worked examples (6)

Model answers (6)

Diffusion & Dilution

Study notes →

Worked examples (6)

Model answers (6)

More Tutopiya study tools

Pair this formula sheet with past papers, revision checklists, and planners — all free on our study tools hub.

Exam technique cheat sheet Command words, mark scheme triggers and per-question tactics for 35 IGCSE, GCSE, A Level and IB subjects.
AI Lesson Analysis guides User guide, feature deep-dives and case studies — plus live demo and free trial for Tutopiya lesson analysis.
All study tools Browse the full hub: calculators, planners, past papers, and more.
Past paper finder Search past papers by board, subject, and year.
Revision checklists Topic-by-topic checklists for IGCSE & A Level (2026 syllabi).
Keywords & definitions Examiner-style keywords and definitions by topic — Cambridge & Edexcel IGCSE & A Level.
Interactive periodic table All 118 elements, filtered to your IGCSE, GCSE, A Level or IB chemistry syllabus.
Free lesson planner Plan IGCSE, GCSE, A-Level & IB lessons with portal links and printable export.
Study planner Build schedules and stay on track before exams.
Past paper error log Log mistakes from papers and review them systematically.
Score tracker Track marks and grades across past paper sittings.
Past paper exam timer Board presets, pacing tips, and a graph of time taken per paper.
Topic & paper planner Plan revision by topic and tie it to past papers.
GPA calculator Convert IGCSE, GCSE, and A Level grades to GPA-style summaries.
The Tutopiya Test Quick diagnostic to see where you stand.
IGCSE resources Practice questions, notes, and guides for Cambridge & Edexcel IGCSE.

Study tools blog A Level resources IB resources