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Chemical Reactions Lesson Notes

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Chemical Reactions Lesson Notes

Authors: Classroom lesson material Year: 2026 Venue: Slide deck Link: Science Class pptx Tags: papers chemistry education science y7 Created: 2026-04-23T00:00:00Z Last Updated: 2026-04-23T00:00:00Z

Summary

This source defines chemical reactions as rearrangements of atoms to create new substances, distinguishes them from physical changes, and explains their characteristics and usefulness. It covers evidence for reactions, types of reactions (exothermic, endothermic, displacement, neutralization), and the role of catalysts.

Core Ideas

  • Chemical reactions rearrange atoms to form new substances and transfer energy.
  • Evidence includes gas release, temperature change, color change, flames, smells, or sounds.
  • Useful for producing medicines, fabrics, fuels; some are harmful like rusting or food spoilage.
  • Physical changes (melting, freezing, dissolving) are reversible and don’t create new substances.
  • Catalysts speed up reactions without being consumed.

Teaching and Assessment Focus

  • Identify chemical reactions vs physical changes using observations.
  • Explain atom rearrangement and irreversibility.
  • Describe exothermic/endothermic reactions and energy transfer.
  • Recognize displacement and neutralization reactions.

Sources

  • sources/Chemical Reactions PPT.pptx

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