Chemical Reactions Chapter 2.4.

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Presentation transcript:

Chemical Reactions Chapter 2.4

Chemical Changes Burn, rot, rust, decompose, ferment, explode, and corrode During a chemical change, the composition of matter always changes.

Chemical Reaction When one or more substances change into one or more NEW substances Reactant at beginning  product at end

Was That A Chemical Change? Transfer of energy Change in color Production of a gas Formation of a precipitate (solid)

Conservation of Mass During chemical rxn. mass of product always = mass of reactants (Law of Conservation of Mass: mass is neither created nor destroyed)