Energy changes

• Energy changes

  Exothermic: Energy is transferred to the surroundings

  Endothermic: Energy is transferred from the surroundings
• Reaction profile: Diagram showing how the energy changes in a reaction
• Activation energy: Minimum amount of energy required before a collision will result in a reaction
• What is a bond energy

  The energy required to break a bond or the energy released when a bond is formed
• In terms of bond breaking and making, what is an exothermic reaction

  Less energy is required to break the old bonds than is released when making the new bonds
• In terms of bond breaking and making, what is an endothermic reaction

  More energy is required to break the old bonds than is released when making the new bonds
• Exothermic, Energy transfer, temp change, bonds

  Energy transfer: To the surroundings

  Temp change: Temp of surroundings increases

  Bonds: More energy released when making bonds than required to break bonds
• Endothermic, Energy transfer, temp change, bonds

  Energy transfer: From the surroundings

  Temp change: Temp of surroundings decreases

  Bonds: Less energy released when making bonds than required to break bonds