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本课题是初中化学第九单元第一课题,根据《课程标准》在这一课题中要求学生建立溶液的概念并认识溶液、溶质、溶剂三者的关系.在本节中,学生对于许多物质都能溶解在水里、水能做许多物质的溶剂这一点很容易接受,但学生对于下面两个问题不大容易理解:1其他液体能否做溶剂感受不深刻;2当水和其他液体混合在一起时哪个做溶质哪个做溶剂.为此,本节课我结合教材上的实验做了一些改进,使学生在教学过程中看的更直观更容易明白.
This subject is the first issue of the ninth unit of junior high school chemistry, according to the “curriculum standards” in this subject require students to establish the concept of solution and understanding of the relationship between the solution, solute, solvent.In this section, students for many substances Soluble in water, water can make many substances in the solvent is easy to accept, but students are not easy to understand the following two issues: 1 other liquids can not feel solvent; 2 when the water and other liquids mixed Which solute which to do when doing solvent.To this end, I combined with the experimental teaching materials to make some improvements, so that students in the teaching process to see more intuitive and easier to understand.