Lesson 2 of 4 · Grade 9 Integrated Science
Chemical reactions, combustion and rusting
15 min
A chemical change forms new substances and is usually not easily reversible. Signs: colour change, gas given off, heat or light produced, a precipitate forms.
A physical change forms no new substance and is easily reversed (melting ice, dissolving sugar).
Combustion (burning)
A fuel reacts with oxygen, giving heat and light.
Fuel + Oxygen → Carbon dioxide + Water + Energy
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