一、教材的地位与学生认知结构分析氮气安排在“氧气”“氯气”“原子结构化学键”“硫”之后,是以已有知识经验和理论为指导进行重点学习的第四个非金属单质。氮单质是最丰富的自然资源之一,它是合成氨、氮肥及硝酸的重要原料。充分认识氮肥对农业粮食增产、解决民生问题有利于激发学生学习本单 First, the status of teaching materials and student cognitive structure analysis Nitrogen arranged in the “oxygen” “chlorine ” “atomic structure chemical bond ” “sulfur ”, is based on existing knowledge and theory as the guideline Learn the fourth non-metallic element. Nitrogen is one of the most abundant natural resources, it is an important raw material for ammonia, nitrogen fertilizer and nitric acid. Fully understand the nitrogen fertilizer on agricultural grain production, solve the livelihood problems is conducive to inspire students to learn this single