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为了使学生巩固已经学习过的关于各类无机化合物的重要化学性质,更清晰的形成氧化物、硷、酸、盐的概念,学会运用知识解决一些简单的实际问题,并为了使学生熟练地掌握使用简单仪器、药品进行实验的方法和溶解、过滤、加热、蒸发等操作的技能技巧,能够独立的进行系统的实验工作。我在讲过初中化学第六章“氧化物、硷、酸、盐”之后进行了一次两节课时的实习作业。在这一章的总结复习之后先布置了下列题目作为家庭作业:“根据你学过的关于氧化物、硷、酸、盐的知识,怎样用最简便的方法从二氧化硅和氧化铜的混合物中提取纯净的氧化铜?写出主要的操作手续,以及有关的化学方程式。[说明:硫酸铜、硝酸铜、氯化铜、钠盐、钾盐均能溶于水]要求学生在下次上课前完成上项作业,让教师详细批改并给予评分。由于学生对这一章各类物质的性质掌握得较好,又经过教师适当的提示说明,在作业上发生理论性错误的为数极少。仅从个别学生的作业中发现有先用碱与二氧化硅作用或应用三氧化硫与氧化铜作用等,但另一方面从作业中也发现了学生对溶液的知识和物质
In order to enable students to consolidate the important chemical properties that have been learned about various inorganic compounds and to create a clearer concept of oxides, bases, acids and salts, to learn to solve some simple practical problems and to make them proficient The use of simple equipment, pharmaceutical methods of experiment and dissolution, filtration, heating, evaporation and other skills and skills to operate independently of the system experiment. I did a two-lesson internship after I spoke about Chemistry, Chapter 6, “Oxides, Alkaloids, Acids and Salts” in Junior High School chemistry. Following the summary review in this chapter, the following topics were arranged for homework: "Based on what you have learned about oxides, bases, acids, and salts, use the simplest method from a mixture of silica and copper oxide In the extraction of pure copper oxide? Write the main operating procedures, and the relevant chemical formula. [Description: copper sulfate, copper nitrate, copper chloride, sodium salt, potassium salt can dissolve in water] Students are required before the next class To complete the previous assignment, let the teacher modify and give a detailed rating as the students of this chapter all kinds of material to better grasp the nature of the class, but also through the teacher’s appropriate instructions, there is a theoretical error in the operation of the very few. From the operation of individual students found that the first with alkali and silica or the application of sulfur trioxide and copper oxide role, but on the other hand from the operation also found that students knowledge of the solution and material