Energy Changes

• An exothermic energy transfer is an energy transfer to the surroundings.
• An endothermic energy transfer is an energy transfer from the surroundings.
• A reaction profile is a diagram showing how energy changes in a reaction.
• Activation energy is the minimum amount of energy required before a collision will result in a reaction.
• Bond energy is the energy required to break a bond or the energy released when a bond is formed.
• An exothermic reaction is when less energy is required to break the old bonds than is released when making the new bonds.
• An endothermic reaction is when more energy is required to break the old bonds than is released when making the new bonds.