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Chemical Equations Parts of an equation and how to balance Chemical Equation: Set of directions for a chemical reaction. The directions tell us: 1. What materials to use 2. How much you need 3. Amount of product you will get Chemical Equations Give info about: Reactants – substances being used in the reaction (starting materials on Left side of equation) Products – new substances formed (ending materials on Right side of equation) * Numbers in Equations Coefficients – small whole numbers in front of compounds ex. 2 NaCl = 2 NaCl ’s Subscripts – small numbers following elements ex. H2O = 2 H’s , 1 O * Indications of a Chemical Reaction 1. Color 2. Gas / Bubbles 3. Precipitate 4. Temperature Change 5. Light Chemists Get Practice Trying Labs (Typically, more than one will be seen) * Diatomic Elements * Two elements that exist bonded together when not bonded to another elements Remember the seven + one rule that starts at element #7 H N, O, F Cl Br I At Chemical Equation Symbols * Symbol (s) (l) (g) (aq) Meaning solid liquid gas aqueous dissolved in water Chemical Equation Symbols * (Cont.) Symbol 3500 Meaning yields equilibrium heated temp at which reaction is run Balancing Equations 1. Check for diatomics 2. Balance metals 3. Balance nonmetals 4. Balance Oxygen 5. Balance Hydrogen 6. Recount all atoms 7. If every coefficient will reduce, write in simplest whole number ratio