由于化学中的“怪物”——特殊性的存在,使许多的命题变为假命题,从而判断错误。在化学复习中既要掌握一般规律,又要熟记“怪物”,这样才能事半功倍。本文将“怪物”总结如下: 1．卤素元素一般都有变价——“怪物”氟除外。2．卤素单质与水反应一般生成HX和HXO——“怪物”氟气除外。 Because of the “monster” in chemistry - the existence of particularity, many propositions are turned into false propositions to judge errors. In chemistry review, we must not only master the general laws but also remember the “monsters” so that we can do more with less. This article summarizes “monsters” as follows: Halogen elements generally have a price change - except “Monster” fluorine. 2. The halogen simple substance reacts with water to generate HX and HXO, except for “Monster” fluorine gas.