Balancing Equations Slides PDF

Balancing Equations Balancing, Writing, and Naming Equations: Mr. Yarndley  Balancing Equations Law of Conservation of Matter: In a chemical reaction, matter can be neither created nor destroyed. In a chemical reaction, the amount of...

Balancing Equations Balancing, Writing, and Naming Equations: Mr. Yarndley  Balancing Equations Law of Conservation of Matter: In a chemical reaction, matter can be neither created nor destroyed. In a chemical reaction, the amount of reactants equal the amount of products. *  Balancing Equations Hydrogen + oxygen water H2 + O 2 H 2O Hydrogen and oxygen are diatomic elements. Their subscripts cannot be changed. The equation above is called a skeleton equation The subscripts on water cannot be changed.*  Balancing Equation H2 + O 2 H 2O Count the atoms on each side. Reactant side: 2 atoms H and 2 atoms O Product side: 2 atoms H and 1 atom O  Balancing Equations H2 + O 2 H 2O If the subscripts cannot be altered, how can the atoms be made equal? Adjust the number of molecules by changing the coefficients. *  Balancing Equations H2 + O 2 2H2O Reactants: 2 atoms of H and 2 atoms of O Products: 4 atoms of H and 2 atoms of O H is no longer balanced!  Balancing Equations 2H2 + O2 2H2O Reactant side: 4 atoms of H and 2 atoms of O Product side: 4 atoms of H and 2 atoms of O It’s Balanced!  Balancing Equations N2 + H 2 NH3 Nitrogen + hydrogen ammonia Count atoms. Reactants: 2 atoms N and 2 atoms H Products: 1 atom N and 3 atoms of NH3  Balancing Equations Nothing is balanced. Balance the nitrogen first by placing a coefficient of 2 in front of the NH3. N2 + H 2 2NH3  Balancing Equations Hydrogen is not balanced. Place a 3 in front of H2. Reactant side: 2 atoms N, 6 atoms H Product side: 2 atoms N, 6 atoms H N2 + 3H2 2NH3  Writing and Naming Remember the diatomic elements: H2, N2, O2, F2, Cl2, Br2, and I2.