Chemistry 2.1

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Chemistry 2.1

  1. 1. Chemistry Chapter 2 - Section 1 Chemical Formulas & Equations Monday, July 9, 2012
  2. 2. Physical or Chemical?Monday, July 9, 2012
  3. 3. Physical or Chemical?Monday, July 9, 2012
  4. 4. Physical or Chemical? Yeast + Hydrogen Peroxide = ???????Monday, July 9, 2012
  5. 5. Chemical Reaction?Monday, July 9, 2012
  6. 6. Chemical Reaction? A process that produces a chemical changeMonday, July 9, 2012
  7. 7. Chemical EquationsMonday, July 9, 2012
  8. 8. Chemical EquationsMonday, July 9, 2012
  9. 9. Chemical Equations Substances that exist before the reaction beginsMonday, July 9, 2012
  10. 10. Chemical Equations Substances that Substances that exist before the form as a result reaction begins of the reactionMonday, July 9, 2012
  11. 11. Describe What is HappeningMonday, July 9, 2012
  12. 12. Describe What is Happening I use a chemical equation to know the reactants, products and proportions of each substance.Monday, July 9, 2012
  13. 13. Describe What is HappeningMonday, July 9, 2012
  14. 14. Describe What is Happening My Chemical Equation can use words, chemical names, or formulas.Monday, July 9, 2012
  15. 15. Using Words Baking Soda + Vinegar --> Gas + White Solid Charcoal + Oxygen --> Ash + Gas + HeatMonday, July 9, 2012
  16. 16. Chemical Names Acidic Acid + Sodium Hydrogen Carbonate --> Sodium Acetate + Water + Carbon DioxideMonday, July 9, 2012
  17. 17. Chemical Formula’s CH3COOH + NaHCO3 --> CH3COONa + H2O + CO2 Acetic Sodium Sodium Water Carbon Acid Hydrogen Acetate Dioxide CarbonateMonday, July 9, 2012
  18. 18. Arrows and SubscriptMonday, July 9, 2012
  19. 19. It’s All a Balancing ActMonday, July 9, 2012
  20. 20. Conserve That MassMonday, July 9, 2012
  21. 21. Conserve That Mass The mass of the products must be the same as the mass of the reactants in the chemical reaction.Monday, July 9, 2012
  22. 22. Conserve That Mass The mass of the products must be the same as the mass of the reactants in the chemical reaction. Atoms are never lost of created in a chemical reaction; however they do change partners.Monday, July 9, 2012
  23. 23. Conserve That MassMonday, July 9, 2012
  24. 24. Let’s Try Tarnishing silver.... Ag + H2S --> Ag2S + H2 Hydrogen Silver Silver sulfide Hydrogen SulfideMonday, July 9, 2012
  25. 25. Let’s TryMonday, July 9, 2012
  26. 26. Let’s Try Na + AlCl3 --> NaCl + Al KBr + Cl2 --> KCl + Br2 H2O2 --> H20 + O2Monday, July 9, 2012
  27. 27. Energy in a Chemical EquationMonday, July 9, 2012
  28. 28. Energy in a Chemical Equation Energy is often released or absorbed during a chemical reaction.Monday, July 9, 2012
  29. 29. Energy ReleasedMonday, July 9, 2012
  30. 30. Energy Released  Where does this energy come from?Monday, July 9, 2012
  31. 31. Energy Released  Where does this energy come from?  You have to think about the chemical bonds of the reactants and the products, in order to answer this question.Monday, July 9, 2012
  32. 32. Energy ReleasedMonday, July 9, 2012
  33. 33. Energy Released  When energy is released, the products are more stable, and their bonds have less energy than those of the reactants.Monday, July 9, 2012
  34. 34. Energy Released  When energy is released, the products are more stable, and their bonds have less energy than those of the reactants.  The extra energy is released in different forms: light, sound, thermal energy.Monday, July 9, 2012
  35. 35. Energy AbsorbedMonday, July 9, 2012
  36. 36. Energy Absorbed  When energy is absorbed, the reactants are more stable, and their bonds have less energy than those of the products.Monday, July 9, 2012
  37. 37. Energy Absorbed  When energy is absorbed, the reactants are more stable, and their bonds have less energy than those of the products.  The extra energy needed to form the products can be supplied in the form of electricity, light, sound, thermal energy.Monday, July 9, 2012
  38. 38. Energy Released 2H2 + O2 --> 2H2O + energyMonday, July 9, 2012
  39. 39. Energy Released 2H2 + O2 --> 2H2O + energy 2H2O + energy --> 2H2 + O2Monday, July 9, 2012
  40. 40. Energy Released 2H2 + O2 --> 2H2O + energy Energy Absorbed 2H2O + energy --> 2H2 + O2Monday, July 9, 2012
  41. 41. When thermal energy is gained or lost, special terms are used….Monday, July 9, 2012
  42. 42. When thermal energy is gained or lost, special terms are used….Monday, July 9, 2012
  43. 43. When thermal energy is gained or lost, special terms are used….Monday, July 9, 2012
  44. 44. When thermal energy is gained or lost, special terms are used…. Absorb Release thermal thermal energy energyMonday, July 9, 2012
  45. 45. Endothermic or Exothermic Absorb or Release Quickly or SlowlyMonday, July 9, 2012
  46. 46. Adding ENERGY to the equationMonday, July 9, 2012
  47. 47. Finished!Monday, July 9, 2012

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