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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Common chemical changes are:
  • A
    Change in temperature
  • B
    Formation of precipitate
  • C
    Formation of bubbles
  • ✓
    All of above
✓

Answer

Correct option: D.
All of above
A change in temperature is characteristic of a chemical change. When the reactants are mixed, the temperature change caused by the reaction is an indicator of a chemical change.
The formation of a precipitate may be one of the most common signs of a chemical reaction taking place. The formation of bubbles, or rather a gas, is another indicator of a chemical reaction taking place. When bubbles form, a temperature change could also be taking place.

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