Exothermic and endothermic

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Exothermic and endothermic

  1. 1. How did fossil fuels form? 500 million years ago living matter- mostly plants- died and was buried in sediment. Pressure, heat, and microbes converted the organic matter into petroleum. Buried sunshine?
  2. 2. Potential Energy Stored energy or energy of position
  3. 3. Kinetic Energy Energy related to motion video clip
  4. 4. Chemical energy A form of potential energy that is stored in the bonds of chemical compounds. Burning hydrocarbons releases energy in the form of heat and light
  5. 5. Types of energy in chemicalreactions Endothermic: energy “enters” the reaction Feels ________________ Exothermic: energy “exits” the reaction Feels ________________
  6. 6. Reactions take place in 2 steps: 1) Bonds must be broken in the starting reactants. * When bonds are broken, energy is released. So this is an exothermic process. CH4 + 2O2  C + 4H + 4O + Energy
  7. 7. Step 2: Separated atoms now join to form a new bonds to make the products. It takes energy to form bonds, so this process is endothermic. Energy + C + 4H + 4O  CO2 + 2 H2O
  8. 8. CH4 + 2O2  C + 4H + 4O
  9. 9. Net equation for burning ofmethane CH4 + 2O2  CO2 + 2H2O + energy Notice the energy shows up as a product so more energy was released so the reaction is exothermic. gummy bear experiment
  10. 10. Energy + 2H2O  2H2 + O2 Is more energy put into the reaction or released by the reaction? Is the reaction endothermic or exothermic? endothermic reaction

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