Chemical Equations Types

Lesson Overview

• Duration: 50 minutes
• Class: Year 10 (ages 14-15)
• Class size: 30 students
• Curriculum Link: National Curriculum for England – KS4 Chemistry content, specifically the development of knowledge and understanding of chemical changes and the representation of chemical reactions (Programme of Study: Chemistry - Atomic structure and the periodic table; Chemical reactions).
• Topic Focus: Types of chemical reactions (displacement, neutralisation, combustion, oxidation, decomposition), understanding reversible vs irreversible reactions, practice writing and identifying word equations.

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National Curriculum References

• Chemistry KS4 Programme of Study, specifically:
  • "Represent chemical reactions using formulae and balanced equations."
  • "Explain how chemical changes involve substances reacting to form different substances and include key reaction types such as combustion and oxidation."
  • "Introduce reversible reactions, and factors affecting the direction of reactions."

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Learning Objectives (WALT)

• WALT:
  • Identify and define key types of chemical reactions.
  • Distinguish between reversible and irreversible reactions with reasons.
  • Write word equations for different reaction types.
  • Practise applying definitions and constructing word equations accurately.

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Success Criteria

• I can describe and define displacement, neutralisation, combustion, oxidation, and decomposition reactions.
• I can explain which reactions are reversible or irreversible and justify why.
• I can write correct word equations matching the reaction type.
• I can confidently apply my understanding in a variety of practice questions.

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Resources Needed

• Whiteboard and markers
• Printed worksheets with practice questions (dyslexia-friendly font, e.g., Arial or Comic Sans, larger text size, and colour-coded key terms)
• Flashcards with reaction definitions & examples
• Mini whiteboards and pens for I do/We do/You do activities
• Visual aids/pictures for reaction examples (e.g., apples browning for oxidation, combustion flames)
• Timer for guided practice intervals

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Lesson Structure

1. Do It Now: Retrieval Practice (5 minutes)

Purpose: Activate prior knowledge and engage memory (Rosenshine Principle: Daily review)

• On entry, pupils answer 3 quick questions on mini whiteboards:
  1. What is a word equation?
  2. Name one reaction type they know from previous lessons.
  3. What happens during combustion?
• Peer discuss answers for 1 minute, followed by whole class share.

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2. Introduction & WALT (3 minutes)

• Share WALT and success criteria clearly.
• Use visual icons next to each success criterion for clarity.
• Explain today’s focus: "We will learn about different types of chemical reactions and how to write their word equations."

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3. I Do: Teacher Modelling (12 minutes)

• Briefly define each reaction with examples:
  • Displacement reaction (e.g., zinc + copper sulfate → zinc sulfate + copper)
  • Neutralisation reaction (acid + base → salt + water)
  • Combustion reaction (fuel + oxygen → carbon dioxide + water)
  • Oxidation reaction (e.g., iron rusting)
  • Decomposition reaction (e.g., heating calcium carbonate → calcium oxide + carbon dioxide)
• Use flashcards and visual aids for definitions.
• Model writing word equations step-by-step for 2-3 examples on the board.
• Highlight which reactions are reversible or irreversible:
  • Explain reversibility using the example of neutralisation (reversible under certain conditions) and combustion (irreversible because energy is released).
• Discuss why reversibility depends on energy changes and reaction environments.
• Use think-alouds to verbalise thought process.

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4. We Do: Guided Practice (15 minutes)

• Display 5 practice questions (all reaction types mixed).
• Work through first two questions together on mini whiteboards:
  1. Identify reaction type from scenario.
  2. Write word equation.
  3. State if reversible or irreversible and explain why.
• Use questioning to engage all pupils ("What clues tell us it’s a combustion reaction?")
• Use paired discussion following each question for peer scaffolding.
• Circulate to offer in-the-moment feedback & support.
• Visual aids/diagrams accompany more challenging questions.
• Differentiate by providing simpler word problems to SEND students, using colour-coding and graphic organisers; challenge more able students to create balanced symbol equations (extension).

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5. You Do: Independent Practice (10 minutes)

• Pupils complete 3 practice questions independently (worksheet):
  • Identify reaction type.
  • Write word equation.
  • Determine reversibility with justification.
• For SEND: provide word banks and sentence starters on worksheet.
• For advanced learners: extra questions involving prediction of products or brief symbol equation writing.
• Encourage pupils to use mini whiteboards or highlight key words to support focus.

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6. Plenary: Recap & Reflect (5 minutes)

• Use a quick-fire quiz format (hands up or mini whiteboards) with 5 rapid questions targeting:
  • Definitions of reactions
  • Identifying reversible/irreversible
  • Writing simple word equations
• Ask: “Why is combustion irreversible?” to check conceptual understanding.
• Highlight next steps and how today’s learning links to future topics on reaction rates and equilibrium.

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Differentiation & Inclusive Strategies

• Use dyslexia-friendly font and colour-coded text in handouts.
• Visual prompts and real-life examples support understanding.
• Allow mixed-ability pair work to encourage peer support.
• Provide sentence starters and word banks for SEND pupils.
• Use mini whiteboards for kinaesthetic learners to engage actively.
• Extension tasks challenge higher ability learners with balanced symbol equations or explanation of energy changes in reversibility.

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Assessment

• Formative assessment through quick questioning, observation during guided practice, and independent work marking.
• Use quiz responses to identify common misconceptions for next lesson focus.

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Reflection & Adaptation Suggestions for Teacher

• Adapt lesson length on modelling based on student responsiveness.
• Incorporate digital quiz apps for retrieval practice if technology allows in future lessons.
• Use student-created flashcards for ongoing revision.

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This lesson plan embeds Rosenshine's Principles through structured review, clear modelling (I do), collaborative work (We do), and independent practice (You do), adapting to diverse learners while ensuring curriculum alignment and deep conceptual understanding.