Question 5 - Are Water-to-Ice and Water-to-Steam Physical or Chemical? - Questions at the end of the chapter - Chapter 5 Class 7 - Changes Around Us: Physical and Chemical (Curiosit

Last updated at July 13, 2026 by

Q5
Question

Are the changes of water to ice and water to steam, physical or chemical? Explain.

📚 Concept: 5.1 A Substance May Change in Appearance but Remain the Same!
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Answer
Both are physical changes .
  • In both cases, only the state of water changes — not the substance itself.
  • Water to ice = liquid → solid (freezing).
  • Water to steam = liquid → gas (boiling/evaporation).
  • In all three states, the substance remains H₂O (water molecules).
  • No new substance is formed in either change.
  • Both changes are also reversible — ice can melt back to water, steam can condense back to water.

→ Pure state changes (solid ↔ liquid ↔ gas) are always physical changes.

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