Kitchen Activities Reversible and Irreversible Changes Class 7
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Kitchen Activities: Reversible and Irreversible Changes Class 7
Kitchen Activities: Reversible and Irreversible Changes Class 7
Observation:
Many changes happen in the kitchen. Let's classify some common ones as physical or chemical, and whether they can be reversed.
| Kitchen Activity | Type of Change | Reversible? | Explanation |
| Melting butter | Physical | Yes | No new substance formed; can solidify again |
| Boiling water | Physical | Yes | Water vapor can condense back to liquid |
| Dissolving sugar in tea | Physical | Yes | Sugar can be recovered by evaporation |
| Cutting vegetables | Physical | No | No new substance, but cannot get whole veg back |
| Cooking an egg | Chemical | No | New substances formed; cannot get raw egg back |
| Baking a cake | Chemical | No | Ingredients react to form new substances |
| Curdling of milk | Chemical | No | New substance is formed; cannot get milk back. |
| Toasting bread | Chemical | No | Browning is a chemical change (Maillard reaction) |
(Some physical changes, like cutting, are technically irreversible in practice, but they do not form new substances)