这已经很通俗了，看下面这个图吧，希望对你有帮助。
不过你最好还是系统地学习一下物理化学。

              ┬     ╭──╮ 过渡态能量                                        
              │     ┆    ┆                                                    
              │     ┆    ┆                                                    
            活化能   ┆    ┆                                                    
              │     ┆    ┆                                                    
              │     ┆    ┆                                                    
  反应物能量  ┴ ──╯    ┆      ┬                                            
                           ┆   自由能变                                        
                           ╰──  ┴     产物能量                              

【 在 songyx (Enjoy everyday) 的大作中提到: 】
: 能通俗的把活化能给解释一下吗
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