C5

• What characterizes an exothermic energy transfer?

  Transfer to the surroundings
• What characterizes an endothermic energy transfer?

  Transfer from the surroundings
• What is a reaction profile?

  A diagram showing energy changes
• What is activation energy?

  Minimum energy for a reaction
• What is bond energy?

  Energy to break or form a bond
• What characterizes an exothermic reaction in terms of bond energy?

  Less energy needed to break bonds
• What characterizes an endothermic reaction in terms of bond energy?

  More energy needed to break bonds