some exqmple of fast change in class 7 physical and chemical change chapter
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Fast changes occur with in seconds or minutes. Whereas slow changes take place very slowly and may take hours, days or months to complete. Examples for fast changes: Burning of paper, Burning of a candle. Examples for slow changes: Rusting of iron, Germination of seed, curdling of milk etc
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Explanation:
CHEMICAL CHANGE
- Burning wood
- Souring milk
- Mixing acid and base
- Digesting food
- Cooking an egg
- Heating sugar to form caramel
- Baking a cake
- Rusting of iron
PHYSICAL CHANGE
- Crumpling a sheet of aluminum foil
- Melting an ice cube
- Casting silver in a mold
- Breaking a bottle
- Boiling water
- Evaporating alcohol
- Shredding paper
- Sublimation of dry ice into carbon dioxide vapor
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