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Types of Reactions and Balancing Equations

Types of Reactions and Balancing Equations. Review Notes Part 1. Subscripts and Coefficients Give Different Information. Subscripts tell the number of atoms of each element in a molecule. Subscripts and Coefficients Give Different Information.

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Types of Reactions and Balancing Equations

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  1. Types of Reactions and Balancing Equations Review Notes Part 1

  2. Subscripts and Coefficients Give Different Information • Subscripts tell the number of atoms of each element in a molecule

  3. Subscripts and Coefficients Give Different Information • Subscripts tell the number of atoms of each element in a molecule • Coefficients tell the number of molecules

  4. Balancing Equations Balancing, Writing, and Naming Equations

  5. Balancing Equations

  6. 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.

  7. Balancing Equations • Paraphrase: • Law of Conservation of Atoms: • The number of atoms of each type of element must be the same on each side of the equation.

  8. Balancing Equations • Hydrogen + oxygen water • H2 + O2 H2O • Hydrogen and oxygen are diatomic elements. • Their subscripts cannot be changed. • The subscripts on water cannot be changed.

  9. Balancing Equation • H2 + O2 H2O • Count the atoms on each side. • Reactant side: 2 atoms H and 2 atoms O • Product side: 2 atoms H and 1 atom O

  10. Balancing Equations • H2 + O2 H2O • If the subscripts cannot be altered, how can the atoms be made equal? • Adjust the number of molecules by changing the coefficients.

  11. Balancing Equations • H2 + O22H2O • 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!

  12. Balancing Equations • 2H2 + O22H2O • 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!

  13. Balancing Equations • N2 + H2 NH3 • Nitrogen + hydrogen ammonia • Count atoms. • Reactants: 2 atoms N and 2 atoms H • Products: 1 atom N and 3 atoms of NH3

  14. Balancing Equations • Nothing is balanced. • Balance the nitrogen first by placing a coefficient of 2 in front of the NH3. • N2 + H22NH3

  15. 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 + 3H22NH3

  16. Balancing Equations • This method of balancing equations is the inspection method. • The method is trial and error. • Practice.

  17. Writing and Naming • Write each formula independently. • Ignore the rest of the equation. • Balance the equation after writing the formulas. • Ni + HCl NiCl2 + H2 • Ni + 2HCl NiCl2 + H2

  18. Cu + H2SO4 • CuSO4 + H2O + SO2 • Balance the formula equation.

  19. Cu + 2H2SO4 • CuSO4 + 2H2O + SO2

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