bond calculations

• hows an exothermic reaction's energy change shown

  shown as negative as energy has been transferred from the reaction to the surroundings
• hows an endothermic reaction's energy change shown

  shown as positive as energy has been taken into the reaction from the surroundings
• breaking a bond is? (exo or endo)

  endothermic as it requires energy to be taken in
• making a bond is? (exo or endo)

  exothermic as it releases energy to the surroundings
• what does a chemical bond's energy value show

  energy required to break that bond