Chapter 5 - Chapter5 I ChemicalReaction: 1 Reactant: 2...

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Chapter 5 Chemical Reactions and Equations I. Chemical Reaction : the conversion of one substance or set of substances into another. 1. Reactan t: substance that we start. 2. Product : new substance that forms during the reaction. Example : NaOH (aq) + HCl (aq) = NaCl (aq) + H2O (l) NaOH, HCl : reactants. NaCl, H 2 0 : products. II. The clues most often when a chemical reaction occurs: 1. Change in color. 2. Production of light. 3. Formation of a solid (precipitate in solution, smoke in air, or a metal coating). 4. Formation of a gas (bubbles in solution of fumes in the gaseous state). 5. Absorption or release of heat ( sometimes appearing as a flame). III. Chemical Equation: 1. Chemical equation : a symbolic representation of a chemical reaction. Ex: aluminum + iron(III) oxide + heat aluminum oxide + iron Al (s) + Fe2O3 a + heat Al 2 O 3(s) + Fe (l) It is important to remember that you cannot change the subscript of an element in a compound to balance an equation. For example, Al 2 O 3 cannot be change to AlO 3 to balance the number of aluminum atoms .
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