Broken bonds are a necessary first step in most of chemical reactions. The energy required for this in initial breaking of bonds can be viewed as an energy barrier. The minimum energy required to overcome this energy barrier is known as the activation energy(活化能) H C-N H c H2c一N≡C H 2c一c≡N Reaction pathwayBroken bonds are a necessary first step in most of chemical reactions. The energy required for this in initial breaking of bonds can be viewed as an energy barrier. The minimum energy required to overcome this energy barrier is known as the activation energy (活化能)