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Changes Changes Presentation Transcript

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