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2 April 2026

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Exothermic & Endothermic Reactions – Lesson, Worksheet & Practical

Edexcel IGCSE Chemistry | Unit 3 | Physical Chemistry

This Synapse Science lesson pack covers Unit 3 – Exothermic and Endothermic Reactions from the Edexcel IGCSE Chemistry specification. It includes a structured lesson, a printable worksheet with exam-style questions, a lab-based practical to classify energy changes, and a complete answer key with mark scheme.

Perfect for teaching or revising the fundamentals of energy changes in chemical reactions, including real-world examples and energy profile diagrams.

Specification Points Covered
  • 3.1: Know that chemical reactions in which heat energy is given out are described as exothermic, and those in which heat energy is taken in are described as endothermic
  • 3.5C: Draw and explain energy level diagrams to represent exothermic and endothermic reactions (optional for higher-tier students)
What’s Included
  • Lesson Slides – Editable PowerPoint presentation with theory, examples, and diagrams
  • Student Worksheet – Printable PDF with exam-style questions and diagrams
  • Practical Activity – Classify four real reactions as exothermic or endothermic using temperature change
  • Teacher & Technician Notes – Method, setup, expected results, and safety guidance
  • Answer Key & Mark Scheme – Full mark breakdowns for all worksheet questions
Key Features
  • Practical activity using safe reactions (neutralisation, salt dissolving, acid + carbonate)
  • Built-in observations table and conclusion prompts
  • Student-friendly diagrams and language
  • Clean Synapse Science layout for consistency across your chemistry curriculum
  • Fully printable and editable — ideal for classwork, homework or revision
Keywords

Edexcel IGCSE Chemistry, Exothermic Reactions, Endothermic Reactions, Energy Changes, Required Practical, Physical Chemistry, Synapse Science, Temperature Change, Energy Profile Diagrams, Worksheet, Mark Scheme

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Get this resource as part of a bundle and save up to 17%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

Bundle

Edexcel IGCSE Chemistry – Unit 3 Complete Bundle (Paper 1 & 2)

# **Edexcel IGCSE Chemistry – Unit 3 Complete Bundle (Physical Chemistry)** Energy Changes, Reaction Rates & Reversible Reactions – Lessons, Worksheets, Practicals & Mark Schemes This Synapse Science bundle provides a complete set of teaching resources for **Unit 3 – Physical Chemistry** in the **Edexcel IGCSE Chemistry (2017) specification**, covering both **Paper 1 (Core)** and **Paper 2 (Triple)** content. The bundle includes fully structured **lessons, worksheets, required practicals, and mark schemes**, allowing teachers to deliver the entire unit with minimal preparation. All resources follow the specification sequence and match the **Synapse Science Scheme of Work for Unit 3**. Every resource follows the consistent **Synapse Science format**, with clear explanations, exam-style questions, and structured learning progression. --- ## Topics Covered (Specification Order – Core & Triple) ### Topic 3A – Energetics Lesson 39 – Exothermic & Endothermic Reactions – Lesson, Worksheet & Practical Lesson 40 – Enthalpy & Calorimetry – Lesson & Worksheet Lesson 41 – Temperature Changes in Reactions – Required Practical (3.8) Lesson 42 – Energy Level Diagrams & Bond Energy – Lesson & Worksheet --- ### Topic 3B – Rates of Reaction Lesson 43 – Rates of Reaction – Lesson & Worksheet Lesson 44 – Rates of Reaction – Surface Area & Concentration (Required Practical 3.15) Lesson 45 – Catalysts – Lesson, Worksheet & Practical Lesson 46 – Effect of Catalysts on Rate – Required Practical (3.16) --- ### Topic 3C – Reversible Reactions Lesson 47 – Reversible Reactions – Lesson, Worksheet & Practical Lesson 48 – Dynamic Equilibrium (Triple) – Lesson & Worksheet --- ## What’s Included **7 complete lessons + 3 required practical investigations (10 teaching resources total)** • Editable PowerPoint lesson slides • Printable and digital student worksheets • Required practical worksheets with teacher notes • Full mark schemes and model answers • Exam-style questions and scaffolded tasks • Consistent Synapse Science layout and formatting --- ## Teaching Structure Each lesson follows a clear teaching sequence: Starter → Core Theory → Activities → Review Worksheets include **graded exam-style questions**, allowing teachers to quickly assess understanding and provide structured feedback. --- ## Ideal For Edexcel IGCSE Chemistry – Unit 3: Physical Chemistry Teachers delivering **Paper 1 and Paper 2 (Triple) content** Schools seeking a **complete ready-to-teach unit** Classwork, homework, revision, or exam preparation --- ## Keywords Edexcel IGCSE Chemistry, Unit 3 Bundle, Physical Chemistry, Energy Changes, Rates of Reaction, Equilibrium, Required Practicals, Synapse Science, Chemistry Lessons, Chemistry Worksheets

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