(一)对教材的体会氮气是空气的重要组成部分,氮元素对学生来说,不是陌生的,但学生对氮的性质的具体理解则是很不够的。因此本单元教材的系统是先从单质氮的性质讲起。并简要地阐明氮气在通常状况下的不活动性,及在特定条件下能和氢、金属、氧等元素直接化合。然后再依次地引出氮和氢的化合物——氨;氮和氧的化合 (A) of the teaching experience Nitrogen is an important part of the air, nitrogen is not unfamiliar to students, but the students of the specific understanding of the nature of nitrogen is not enough. Therefore, the textbook system of this unit starts with the nature of elemental nitrogen. And briefly explain the nitrogen inactivity under normal conditions, and under certain conditions with hydrogen, metal, oxygen and other elements of direct combination. Then in turn leads to nitrogen and hydrogen compounds - ammonia; nitrogen and oxygen