Concept 1 of 8Foundation
Watch on YouTubeVideoChanges are everywhere
Nothing stays exactly the same. Change happens constantly — leaves turn yellow, ice melts, iron rusts, babies grow.
Scientists classify changes in four ways:
- Reversible vs Irreversible
- Physical vs Chemical
- Fast vs Slow
- Desirable vs Undesirable
A single change often belongs to several categories at once.
Example
Milk → curd: chemical, irreversible, slow, desirable.
Paper burning: chemical, irreversible, fast, undesirable (usually).
Paper burning: chemical, irreversible, fast, undesirable (usually).
💡 Tip:Look for signs: new smell, new colour, gas evolved, heat given out, impossible to reverse → chemical.
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5 questions to check what you just read.
0 / 5
- Q1.A change we can undo is:
- Q2.A change we CANNOT undo:
- Q3.A paper burning is:
- Q4.A shirt drying after washing:
- Q5.Change categories include: