Chemical Reactions.

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Presentation transcript:

Chemical Reactions

Evidence for a Chemical Reaction Color Change Solid(Precipitate) forms Gas is released ex. Bubbles Energy is given off or absorbed in the form of heat or light

Chemical Equations Chemical reactions are represented by chemical equations Reactants Products Mass of reactants = mass of products Law of Conservation of Mass- atoms are not created or destroyed in a chemical reaction Yield

Chemical Equations Chemical equations also identify The physical state of each reactant and product Condition of reaction Amount of each compound needed

Balancing Chemical Equations Since no atoms can be created or destroyed in a reaction: The number of atoms on the product side must be the same as the number of atoms on the reactant side Use an atom inventory to balance the elements