教化学的王老师富有教学经验。以下是由他点拨，同学们预习催化剂概念的记录。首先王老师利用小黑板的一角形象直观地出示下列内容：顺口溜速率改变催化剂，加快减慢双重意；反应前后量不变，化学性质也不移；它非原物生成物，作为条件不可弃；一应并非只一剂，不同反应有差异 Professor Wang, who teaches chemistry, has a wealth of teaching experience. The following is a record of his students’ preview of the catalyst concept. First of all, Mr. Wang uses the corner of a small blackboard to visually present the following: The rate of change in the rate of catalyst changes and the dual meaning of slowing down; The quantity before and after the reaction remains unchanged, and the chemical properties are not changed; it is not the original product, as a condition is not to be abandoned; One should not be only one dose, different reactions have different