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化学实验可以培养学生的创新思维。在化学实验中,学生可以在掌握一定知识和技能的基础上,凭借自己的头脑去解决一些简单的新问题,探索一些新的知识。所以我们就“铜与浓硝酸、稀硝酸的反应”(苏教必修1第四单元第三节“硝酸的性质”)实验探讨,本环节的重难点就是浓硝酸、稀硝酸与铜反应时,气体产物不同,共有产物是硝酸铜。在课本上硝酸与铜的反应为演示实验,不利于学生的观察。改成分组实验,不仅利于观察,而且更好
Chemistry experiments can cultivate students’ innovative thinking. In chemistry experiments, students can solve some simple new problems and explore some new knowledge by using their own minds on the basis of acquiring certain knowledge and skills. Therefore, we “experiment on the reaction between copper and concentrated nitric acid and dilute nitric acid” (Sujiao Compulsory 1, Unit 4, Section 3, “Nature of Nitric Acid”). The crux of the process is concentrated nitric acid, dilute nitric acid Copper reaction, the gas product is different, the common product is copper nitrate. The reaction of nitric acid and copper in the textbook is a demonstration experiment, which is not good for students’ observation. Into a group experiment, not only conducive to observation, but also better