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苏教版、人教版等高中化学教材都在必修1中介绍了萃取操作。萃取是学生继初中学习过的蒸发、结晶、过滤等之后的又一种关于物质分离与提纯的实验方法。萃取在实验、生活和科学研究等领域的应用十分广泛,笔者在教学设计中,在学生认知的最近发展区对其进行了适度加工和拓展延伸,从而使学生对这一知识点的认识更加全面和系统。一、关于萃取“模型”
Sujiao version, PEP and other high school chemistry textbooks are introduced in the compulsory 1 extraction operation. Extraction is a kind of experimental method of material separation and purification after evaporation, crystallization, filtration and so on that students have learned from junior high school. Extraction in the experimental, living and scientific research fields such as a wide range of applications, the author in the teaching design, the students in the most recent development of the area of its processing and extension of an appropriate extension, so that students know more about this knowledge point Comprehensive and systematic. First, on the extraction “model ”