2 Minute Drill Homework Complete the Chemical Equation worksheet Learner Objective Learner will be able to balance the reactants and products of a chemical reaction equation . Lec: Balancing Chemical Equations NaOH + HCl NaCl + H2O When balancing a chemical equation the quantity and types of elements in the reactants has to be equal to the quantity and types of elements in the products. NaOH + HCl NaCl + H2O Step 1. Break the reactants and products down into the type of elements. Na O H Cl Na O H Cl NaOH + HCl NaCl + H2O Step 2. Place the quantity of each element in the reactants and products. Na:1 O:1 H:2 Cl:1 Na:1 O:1 H:2 Cl:1 NaOH + HCl NaCl + H2O Step 3. Determine if the quantities of each element are the same. If they are you will state “The chemical equation is balanced. If not, state which elements are not. Na:1 Na:1 O:1 O:1 H:2 H:2 Cl:1 Cl:1 Fe(s) + O2 Step 1: Fe O Fe2O3 Fe O Fe(s) + O2 Fe: 1 O: 2 Fe2O3 Fe: 2 O: 3 Is this chemical equation balanced? The chemical equation is not balanced because both Fe and O are not equal. HCl + O2 Cl2 + H2O Is this chemical equation balanced? Balancing a chemical equation with a Chemical Group Pb(NO3)2 + KI PbI2+ KNO3 Balancing a chemical equation with a Chemical Group Pb(NO3)2 + KI PbI2+ KNO3 NO3 is a chemical group on both sides of the chemical equations. Balancing an chemical equation with a Chemical Group Pb(NO3)2 + Step 1 Pb: NO3: K: I: KI PbI2+ Pb: NO3 : K: I: KNO3 Balancing an chemical equation with a Chemical Group Pb(NO3)2 + KI Pb: 1 NO3: 2 K: 1 I: 1 Is this chemical equation balanced? PbI2+ Pb :1 NO3 :1 K :1 I: 2 KNO3 Challenger Balancing a Chemical Equation when the number of elements on both sides are not equal. Fe(s) + O2 Fe: 1 O: 2 Fe2O3 Fe: 2 O: 3 Fe(s) + 3O2 2Fe2O3 Step 3: (reactants) (products) Fe: 1 Fe: 2 O: 2 x 3 = 6 O: 3 x 2 = 6 Fe(s) + 3O2 2Fe2O3 Step 3:The increase in O on the product side causes the Fe to increase too and now needs to be increased. Fe: 1 O: 2 x 3 = 6 Fe 2 x 2 = 4 O: 3 x 2 = 6 4 Fe(s) + 3 O2 Fe 1 x 4 = 4 O 2x3=6 2 Fe2O3 Fe 2 x 2 = 4 O 3x2=6 4 Fe(s) + 3 O2 2 Fe2O3 What does this chemical reaction make? 4 Fe(s) + 3 O2 2 Fe2O3 What does this chemical reaction make? Answer: Rust! Balancing an chemical equation with a Chemical Group Pb(NO3)2 + Pb: 1 NO3: 2 K: 1 I: 1 KI PbI2+ Pb :1 NO3 :1 K :1 I: 2 KNO3 Pb(NO3)2 + KI Pb: 1 NO3: 2 K: 1 I: 1 PbI2+ 2KNO3 Pb :1 NO3 :1 x 2 =2 K :1 I: 2 Pb(NO3)2 + 2KI Pb: 1 NO3: 2 K: 1 x 2 = 2 I: 1 PbI2+ 2KNO3 Pb :1 NO3 :1 x 2 = 2 K :1 x 2= 2 I: 2 Pb(NO3)2 + 2KI Pb: 1 NO3: 2 K: 1 x 2 = 2 I: 1 x 2 = 2 PbI2+ 2KNO3 Pb :1 NO3 :1 x 2 =2 K :1 x 2= 2 I: 2 H2SO4 + NaOH HOH + Na2SO4