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CHAPTER 11 BALANCING EQUATIONS CHEMICAL REACTIONS SIGNS THAT A CHEMICAL REACTION HAS OCCURRED 1) LIGHT AND/OR HEAT GIVEN OFF 2) GAS / BUBBLES RELEASED 3) A COLOR CHANGE 4) PRECIPITATE FORMS (SOLID FROM 2 LIQUIDS) SYMBOLS THE FOLLOWING SYMBOLS ARE USED TO REPRESENT THE PHASE OF COMPOUNDS IN A REACTION. S = SOLID C = CRYSTAL G = GAS Aq = AQUEOUS SOLUTION L = LIQUID DIATOMIC ELEMENTS THESE ELEMENTS ARE SO REACTIVE THAT THEY WILL FORM A BOND WITH THEMSELVES. I2 H2 N2 O2 Br2 F2 Cl2 I HAVE N O BROWNIES FOR CLASS PARTS OF A CHEMICAL REACTION 1 + 1 → 2 3 + 3 1 = REACTANTS 2 = YIELDS/ FORMS/ PRODUCES/MAKES 3 = PRODUCTS STEPS USED TO BALANCE EQUATIONS 1) INCLUDE ALL REACTANTS AND PRODUCTS. 2) CORRECT FORMULAS (OXIDATION #S) 3) REACTANT SIDE MUST = PRODUCT SIDE 4) EQUATIONS ARE BALANCED BY COEFFICIENTS IN FRONT OF COMPOUNDS. HINTS 1) START ON THE LEFT AND WORK TO THE RIGHT 2) THINK MULTIPLY NOT ADD 3) BALANCE BY USING COEFFICIENTS 4) DO NOT CHANGE SUB SCRIPTS 5) IF YOU HAVE 3 OR MORE OF THE SAME ELEMENT SAVE IT FOR LAST. EXAMPLE CH4 + O2 --> REACTANTS H2O + CO2 PRODUCTS EXAMPLE CH4 + O2 --> REACTANTS 1CH4 = + O2 --> H2O + CO2 PRODUCTS H2O + 1CO2 EXAMPLE CH4 + O2 --> REACTANTS CH4 4 + O2 --> H2O + CO2 PRODUCTS 2H2O + CO2 2X2 =4 EXAMPLE CH4 + O2 --> REACTANTS CH4 + 2O2 --> 2X2=4 H2O + CO2 PRODUCTS 2H2O + CO2 2X2 = 4 EXAMPLE CH4 + O2 --> REACTANTS H2O + CO2 PRODUCTS 1CH4 + 2O2 --> 2H2O + 1CO2 2X2=4 2+2 = 4