Chemistry 2.1
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Chemistry 2.1

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Chemistry 2.1 Chemistry 2.1 Presentation Transcript

  • Chemistry Chapter 2 - Section 1 Chemical Formulas & Equations Monday, July 9, 2012
  • Physical or Chemical?Monday, July 9, 2012
  • Physical or Chemical?Monday, July 9, 2012
  • Physical or Chemical? Yeast + Hydrogen Peroxide = ???????Monday, July 9, 2012
  • Chemical Reaction?Monday, July 9, 2012
  • Chemical Reaction? A process that produces a chemical changeMonday, July 9, 2012
  • Chemical EquationsMonday, July 9, 2012
  • Chemical EquationsMonday, July 9, 2012
  • Chemical Equations Substances that exist before the reaction beginsMonday, July 9, 2012
  • Chemical Equations Substances that Substances that exist before the form as a result reaction begins of the reactionMonday, July 9, 2012
  • Describe What is HappeningMonday, July 9, 2012
  • Describe What is Happening I use a chemical equation to know the reactants, products and proportions of each substance.Monday, July 9, 2012
  • Describe What is HappeningMonday, July 9, 2012
  • Describe What is Happening My Chemical Equation can use words, chemical names, or formulas.Monday, July 9, 2012
  • Using Words Baking Soda + Vinegar --> Gas + White Solid Charcoal + Oxygen --> Ash + Gas + HeatMonday, July 9, 2012
  • Chemical Names Acidic Acid + Sodium Hydrogen Carbonate --> Sodium Acetate + Water + Carbon DioxideMonday, July 9, 2012
  • Chemical Formula’s CH3COOH + NaHCO3 --> CH3COONa + H2O + CO2 Acetic Sodium Sodium Water Carbon Acid Hydrogen Acetate Dioxide CarbonateMonday, July 9, 2012
  • Arrows and SubscriptMonday, July 9, 2012
  • It’s All a Balancing ActMonday, July 9, 2012
  • Conserve That MassMonday, July 9, 2012
  • 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
  • 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
  • Conserve That MassMonday, July 9, 2012
  • Let’s Try Tarnishing silver.... Ag + H2S --> Ag2S + H2 Hydrogen Silver Silver sulfide Hydrogen SulfideMonday, July 9, 2012
  • Let’s TryMonday, July 9, 2012
  • Let’s Try Na + AlCl3 --> NaCl + Al KBr + Cl2 --> KCl + Br2 H2O2 --> H20 + O2Monday, July 9, 2012
  • Energy in a Chemical EquationMonday, July 9, 2012
  • Energy in a Chemical Equation Energy is often released or absorbed during a chemical reaction.Monday, July 9, 2012
  • Energy ReleasedMonday, July 9, 2012
  • Energy Released  Where does this energy come from?Monday, July 9, 2012
  • 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
  • Energy ReleasedMonday, July 9, 2012
  • 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
  • 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
  • Energy AbsorbedMonday, July 9, 2012
  • 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
  • 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
  • Energy Released 2H2 + O2 --> 2H2O + energyMonday, July 9, 2012
  • Energy Released 2H2 + O2 --> 2H2O + energy 2H2O + energy --> 2H2 + O2Monday, July 9, 2012
  • Energy Released 2H2 + O2 --> 2H2O + energy Energy Absorbed 2H2O + energy --> 2H2 + O2Monday, July 9, 2012
  • When thermal energy is gained or lost, special terms are used….Monday, July 9, 2012
  • When thermal energy is gained or lost, special terms are used….Monday, July 9, 2012
  • When thermal energy is gained or lost, special terms are used….Monday, July 9, 2012
  • When thermal energy is gained or lost, special terms are used…. Absorb Release thermal thermal energy energyMonday, July 9, 2012
  • Endothermic or Exothermic Absorb or Release Quickly or SlowlyMonday, July 9, 2012
  • Adding ENERGY to the equationMonday, July 9, 2012
  • Finished!Monday, July 9, 2012