Lab Safety Awareness

Overview

• Unit: Chemical Changes Uncovered (Lesson 4 of 5)
• Duration: 50 minutes
• Class Size: 30 students (44.4% SEND)
• National Curriculum Links:
  • KS3 Science Programme of Study – Working Scientifically and Chemistry:
    • Recognise hazard symbols and associated risks (NC ref: KS3 Chemistry, Sc5/1.5a)
    • Demonstrate safe working practices in practical science (Sc5/1.1a)
• Learning Focus: Identifying chemical safety hazards and precautions in the laboratory.

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Learning Objectives (WALT)

• WALT: Identify hazards and safety precautions in the lab.
• Success Criteria:
  • Students can correctly name at least two safety precautions related to specific hazard symbols.
  • Students can explain the risks associated with common chemical hazards.

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Curriculum Links

• Chemical Changes Uncovered Unit: Safety and practical skills in chemistry experiments
• Working Scientifically: Understanding and applying risk assessments and safe practice (NC KS3)
• Cross-curricular links: PSHE (Personal safety and responsibility)

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Resources

• Pictorial hazard symbol flashcards (dyslexia-friendly with clear images and colour coding)
• Laminated student safety checklists
• Whiteboard and coloured markers
• Projector for symbol presentations
• Worksheets for symbol identification and matching safety precautions
• Materials for poster creation (A3 paper, markers, crayons)

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Lesson Structure

1. Do It Now: Retrieval Practice (8 minutes)

Activity: Quick recall quiz on material from Lessons 2 & 3

• Questions include:
  • Name a type of chemical reaction studied (e.g., acid-base reactions).
  • Recall what happened in an earlier experiment (e.g., bubbling/gas release).
  • What previous safety rule did you follow in the lab?
• Differentiation:
  • Provide multiple-choice options for SEND students.
  • Visual scaffold prompts to support recall (images from prior lessons).

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2. Introduction & Discussion (7 minutes)

• Present the topic: "Safety in the Lab" using WALT and Success Criteria.
• Show pictorial hazard symbols one by one (corrosive, flammable, toxic, irritant).
• Briefly explain the meaning of each symbol with real-world examples.
• Rosenshine Principle: Use questioning & checking for understanding after each symbol.

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3. Main Activity – Group Symbol Matching Game (15 minutes)

• Split class into 6 groups (5 students per group, mixed abilities).
• Each group receives a set of hazard symbol cards and separate safety precaution cards.
• Task: Match hazard symbols to the correct safety precautions (e.g., wear gloves for corrosive chemicals).
• Groups discuss and write two precautions per symbol.
• Teacher circulates, scaffolds and probes thinking.

Differentiation:

• Highlight key symbols for SEND groups with pictures and keywords.
• Extension groups: add why these precautions work or suggest additional safeguards.

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4. Whole Class Feedback & Discussion (10 minutes)

• Groups present one symbol and their precautions.
• Teacher clarifies misconceptions and highlights important safety messages.
• Use mini whiteboards for quick individual recall of matched pairs.
• Reinforce correct scientific vocabulary aligned with NC standards.

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5. Extension Task – Create a Safety Poster (7 minutes)

• For early finishers or advanced learners: design a visual safety poster for the classroom.
• Include at least three hazard symbols and corresponding safety rules.
• Encourage creativity using pictures, colours, and catchy slogans.

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6. Plenary – Success Criteria Check (3 minutes)

• Ask students to self-assess if they can name two safety precautions related to the symbols covered.
• Quick thumbs up/down or exit ticket: write one safety tip learned today.
• Optionally read out and display some exit tickets on board.

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Differentiation Strategies

• SEND support:
  • Use dyslexia-friendly materials (clear font, pictorial symbols).
  • Step-by-step visual instructions.
  • Provide word banks for key vocabulary.
• Higher achievers:
  • Challenge to explain why safety precautions are essential.
  • Extend by researching an uncommon hazard symbol.
• EAL learners:
  • Use bilingual glossaries where required.
  • Label pictures with key vocabulary.

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Assessment & Feedback

• Formative throughout: questioning, group discussions and matching activities.
• Summative via exit tickets summarising safety knowledge.
• Teacher feedback spotting misconceptions about hazards or precautions.

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Reflection & Adaptations for Next Lesson

• Monitor students’ retention of safety vocabulary via next practical experiment.
• Provide alternative recording methods (voice/diagram) for those struggling with writing.
• Plan follow-up safety games or interactive quizzes to consolidate learning.

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Additional Notes for Teachers

• Maintain safety-first ethos in the classroom – model wearing PPE yourself.
• Use real practical examples to contextualise symbols to student experiences.
• Use the Rosenshine Principles throughout, especially spaced retrieval and modelling.

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By embedding hazard symbol knowledge early, students develop sound awareness crucial for both science and everyday life—ensuring safe, confident engagement in future chemical investigations.