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Physical and Chemical Change — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYPhysical and Chemical Change3 Marks
Question
Mention a change which is always
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Answer

  1. Desirable : Changes that are useful to man are desirable changes, e.g. change of milk into curd.
  2. Undesirable : Change that brings about destruction is an undesirable change, e.g. floods and epidemics are undesirable changes.
  3. Periodic : Changes that are repeated at regular intervals of time are called periodic changes, e.g. change of day and night.

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