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BALANCING CHEMICAL EQUATIONS Allie Burke, Mason Glass, Stephanie Shirvell BALANCING EQUATIONS When a chemical reaction occurs, it can be described in a mathematical equation. The chemicals on the left side represent the reactants and the chemicals on the right side represent the product that is formed after the reaction occurs. LAW OF CONSERVATION OF MASS The law of conservation of mass states that matter cannot either be created or destroyed in a chemical reaction. This means that the mass on both sides of an equation comparing reactants to products must be the same. HOW TO BALANCE Think of a teeter totter. The mass on both sides must be the same for the activity to work properly. Therefore you must change the amount of atoms in each chemical to balance the sides. UNBALANCED REACTION In an unbalanced reaction, the number of atoms of each chemical are different on each side. For example: H2 + O2 H2O In this example the hydrogen atoms are balanced, there are two on each side, yet the oxygen atoms are unbalanced. There are two atoms on the left side and only one on the right side. H2 + O2 H2O 2 + 2 2 1 NEXT STEP H2 + O2 H2O To balance this equation You need to Change the numbers of oxygen on the right side. You cannot add a subscript number in a reaction to change the amount of atoms, you can only change the amount of compounds. Therefore you add another to the front of the compound. Since the compounds cannot be separated, you cannot just add a two in front of the oxygen atom only, it has to be in front of the whole compound. H2 + O2 2H2O 2+ 2 4 2 Great! Now the oxygen atoms are balanced, yet there’s another problem. Now the hydrogen atoms aren’t balanced. It is still an unbalanced equation. ITS BALANCED! H2 + O2 2H2O 2 + 2 4 2 To balance this equation, you need to make the Hydrogen atoms on the left hand side equal to the atoms on the left hand side. Therefore you add another change the one H2 to 2H2 . 2H2 + O2 2H2O 4 + 2 4 2 IT’S BALANCED!!!!! BIBLIOGRAPHY wikipedia.org vision learning balancing chemical equations Balancing Equations Picture Law of Conservation of Mass Winne The Poo teeter totter picture balanced teeter totter