Concept 4 of 8Foundation
Watch on YouTubeVideoChemical changes
A chemical change creates NEW substances with different properties.
Telltale signs of chemical change:
- Colour change (iron → brown rust)
- Gas evolved (baking soda + vinegar → bubbles)
- New smell (egg cooking)
- Heat or light given off (burning)
- Sound (explosion)
- Permanent, cannot be reversed
Example
Baking soda + vinegar → vigorous fizz (CO₂ gas). That fizz tells you new substances have formed.
💡 Tip:Most chemical changes are irreversible by simple physical means.
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5 questions to check what you just read.
0 / 5
- Q1.Sign of a chemical change:
- Q2.Example of chemical change:
- Q3.Vinegar + baking soda bubbles because:
- Q4.Cooking an egg is:
- Q5.Which suggests a chemical change?