Curriculum
Science — Second Preparatory
Unit 1: Matter and Energy
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Unit 2: Matter and Chemical Reactions
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Unit 3: Energy Flow in Photosynthesis and Respiration
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Unit 4: Geological Processes
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Text lesson
Chemical Reactions
Chemical Reactions
Lesson summary
Lesson summary
- A chemical reaction turns reactants into new products after bonds are broken and new bonds are formed.
- Signs of a reaction include colour change, gas production, precipitate formation, heat change and light.
- A chemical change alters the chemical composition, while a physical change does not.
- Mass is conserved in a chemical reaction the mass of the reactants equals the mass of the products.
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