From the list below, identify which situation(s) contain chemical changes.

I) A pot of water is being heated on a stove. Bubbles form and condensation appears on the lid of the pot.

II) A translucent, blue copper (II) sulfate solution is mixed with water and changes to a translucent lighter blue color.

III) Ammonium nitrate solid in added to water and the temperature drops significantly.

IV) Red and blue paint are mixed together and the color purple appears.
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