2 Reactants yield Products REVIEW:The starting materials are called reactantsThe ending materials are called productsReactants yield Products
3 Why we balance equations: The Law of Conservation of Matter states that matter can not be created or destroyed. So we need to have the same number of atoms before the reaction as after the reaction. The number of reactant atoms = product atoms.
5 How to balance equations: Step 1:Write the equation and count the number of each atom, both reactant and product.Put this information in a before and after chart.
6 CH4 + O2 = CO2 + H2O CH4 + 2O2 = CO2 + 2H2O Carbon has 1 on each sideHydrogen is unbalanced, 4 and 2Oxygen is unbalanced, 2 and 3Step 2:Place a coefficient in front of the molecule to balance the equationCH O2 = CO H2O
7 Step 2:Place a coefficient in front of the molecule to balance the equationCH O2 = CO H2OC = 1 C = 1H = 4 H = 4O = 4 O = 4