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Question

Explain how the following changes are identified as chemical or physical changes?

  1. Burning of wood

  2. Cutting of wood

  3. Conversion of steam to water

  4. Rusting of almirah


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Solution

  1. Burning of wood - Chemical change ‐The chemical composition of wood changes.

  2. Cutting of wood - Physical change - The chemical composition remains the same, only the size of the wood changes.

  3. Conversion of steam to water- Physical change - No change in chemical nature of the substance.

  4. Rusting of almirah- Chemical change ‐ Iron present in almirah converts into iron oxide (new compound) due to the presence of moisture.


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