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10-10-2017
Chemistry

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Which is a sign of a chemical change?

A) Ice cream left at room temperature melts.
B) Calcium chloride is dissolved in H2O and disappears.
C) Paint on a freshly painted wall dries and is no longer sticky.
D)When H2S gas is bubbled into a lead acetate solution, a precipitate forms.

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10-10-2017

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