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一、实验目的由于江苏省化学学科在高考中地位的下降,直接导致初中化学课程地位也随之降低,很多地市的中考化学分值下降,初中化学教师所教班级数目增多。淮安尤其严重,初中化学学科的中考分值由100分变为60分,教师被要求至少带3个班才是满工量,而且课的安排大多是在下午,往往是三节课连续上,这样导致我市的化学教师在教授氧气性质这一节内容时,手忙脚乱,无暇应对。每个班演示氧气性质实验至少需要5瓶氧气,3个班至少要15瓶,如果提前收好氧气,放在准备室,很容易逸散掉,而且将集满氧气的集气瓶向教室运输时,也
First, the purpose of the experiment As the chemical industry in Jiangsu Province in the college entrance examination status decline, a direct result of junior high school chemistry courses also will reduce the status of many places in the test scores dropped, the number of junior high school chemistry teachers taught classes increased. Huaian is particularly serious, junior high school chemistry exam scores from 100 points to 60 points, teachers were asked to take at least three classes is full, and the class arrangement is mostly in the afternoon, often three consecutive classes, so As a result, the city’s chemistry teacher was confused and confused when teaching the nature of oxygen. Each class demonstrated the oxygen nature of the experiment requires at least 5 bottles of oxygen, 3 classes at least 15 bottles, if you receive oxygen in advance, on the preparation room, it is easy to escape, and the oxygen-filled gas cylinders to the classroom transport When, too