Changes

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Changes

  1. 1. Changes
  2. 2. Mechanical change <ul><li>Changing the appearance of something without disturbing the chemical bonds </li></ul><ul><ul><li>Crush </li></ul></ul><ul><ul><li>Dissolve </li></ul></ul><ul><ul><li>Vaporize </li></ul></ul><ul><ul><li>Dehydrate (ex dehydration synthesis) </li></ul></ul><ul><li>Relatively easily reversible </li></ul>
  3. 3. Chemical Change <ul><li>Rearranges the bonds within molecules to form new substances </li></ul><ul><ul><li>Wood burning </li></ul></ul><ul><ul><li>Decay </li></ul></ul><ul><ul><li>Rusting </li></ul></ul>
  4. 4. Chemical Change and Energy <ul><li>Energy is put in or released when the new bonds are formed </li></ul><ul><li>Activation energy – what is needed to start the reaction </li></ul>
  5. 5. Rate of Reaction <ul><li>Influenced by </li></ul><ul><ul><li>Reagent availability (raw materials) </li></ul></ul><ul><ul><li>Temperature </li></ul></ul><ul><ul><li>pH </li></ul></ul>
  6. 6. Catalysts <ul><li>Speed up the rate of reactions </li></ul><ul><ul><li>Platinum within catalytic converter in car </li></ul></ul><ul><ul><li>Silver with Hydrogen Peroxide </li></ul></ul><ul><ul><li>Hand warmer thingy </li></ul></ul>
  7. 7. Enzymes <ul><li>Catalysts that are large organic molecules (proteins) that change the rate of reaction </li></ul><ul><li>Specific to the reaction </li></ul>

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