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In a container, a solid consisting of white crystals is combined with a blue liq...

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In a container, a solid consisting of white crystals is combined with a blue liquid and the following observations are obtained.

  1. The colour of the liquid changed from blue to yellow.
  2. The solid got smaller.
  3. The solution temperature changed from 25 °C to 30 °C.
  4. Bubbles formed in the container.

Which of these indicate a chemical reaction has occurred?

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