这节课的难点是实验室制备二氧化碳的原理。在一般的教学过程中 ,都是由教师直接告诉学生 ,用石灰石或大理石和稀盐酸反应。学生只能被动接受。为了突破难点 ,结合知识的发展过程和学生的认知过程 ,设计问题 :( 1)哪些物质反应可以产生二氧化碳 ?( 2 )实验室为什么选择碳酸盐和 The difficulty of this lesson is the principle of laboratory carbon dioxide preparation. In the general teaching process, teachers directly tell students that limestone or marble react with dilute hydrochloric acid. Students can only accept passively. In order to break through the difficulties, combined with the development process of knowledge and the cognitive process of students, the design questions: (1) What material reactions can produce carbon dioxide? (2) Why labs choose carbonate and