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How do you know a chemical How do you know a chemical reaction has occurred?reaction has occurred?
Unlike a physical change, where no Unlike a physical change, where no substances are created, a chemical substances are created, a chemical change creates new substances by change creates new substances by rearranging atoms.rearranging atoms.
Law of Conservation of Mass –states Law of Conservation of Mass –states that during a chemical reaction, that during a chemical reaction, mass is neither created nor mass is neither created nor destroyed. destroyed.
Evidence of a Chemical Evidence of a Chemical ReactionReaction
Precipitation – a Precipitation – a solid is created.solid is created.
Evidence of a Chemical Evidence of a Chemical ReactionReaction
Formation of Formation of water- water-
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