What chemical change would you observe when:
(a) Mercuric oxide is heated.
(b) Dilute HCl is added to zinc metal.
(c) Water is added to quicklime.
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Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
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