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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes2 Marks
Question
Give example of two substances that can undergo physical and chemical changes, depending upon the conditions.
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Answer

  1. On heating, wax melts (physical change) but on burning it forms carbon dioxide (chemical change).
  2. On heating, water converts to water vapours (physical change) but on passing electricity through it, it splits into hydrogen and oxygen (chemical change).

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