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Question
Some changes are given here. Write physical changes in the area marked 'A' and chemical changes in the area marked 'B'. Enter the changes which are both physical and chemical in the area marked 'C'.
Process of burning a candle; Tearing of paper; Rusting; Curdling of milk; Ripening of fruits; Melting of ice; Folding of clothes; Burning of magnesium; and Mixing baking soda with vinegar.
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Answer
| Region | Type | Items from the list |
|---|---|---|
| A | Physical changes only | Tearing of paper; Melting of ice; Folding of clothes |
| C (overlap) | Both physical AND chemical | Process of burning a candle |
| B | Chemical changes only | Rusting; Curdling of milk; Ripening of fruits; Burning of magnesium; Mixing baking soda with vinegar |
Why each placement:
- Tearing paper, melting ice, folding clothes โ only appearance/state changes; same substance.
- Burning a candle โ melting and evaporation of wax (physical) PLUS combustion of wax vapour (chemical) โ goes in the overlap.
- Rusting, curdling, ripening, magnesium burning, baking soda + vinegar โ all form new substances.
