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Physical and Chemical Change — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYPhysical and Chemical Change3 Marks
Question
What are reversible and irreversible changes ? Give one example for each.
Change is the law of nature and occur in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Reversible and irreversible change.
✓

Answer

  1. Reversible change : When a change in a substance can be reversed by changing the conditions, it is said to be a reversible change.
    Example : Melting of ghee or wax.
  2. Irreversible change : When a substance can not be brought back to its original state after a change, it is said to be an irreversible change.
    Example : Souring of milk.

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