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化学是一门以实验为基础的学科。它不仅要求学生去学去记,还要去做。做实验对提高学生的动手操作能力有很大的帮助,但在实验过程中,学生一些不规范的操作小则损坏仪器,大则对学生的安全构成威胁。下面的这些违规操作是学生经常碰到的:一、试管的违规使用1.加热时试管外壁有水就直接加热,使试管炸裂。2.加热时没有先预热直接对某一点加热,使试管炸裂。3.加热时试管的液体超过容积的三分之一,且管口对着人,液体飞溅,伤到人。
Chemistry is an experiment-based discipline. It not only requires students to learn to remember, but also to do. Experiments to improve the ability of students to operate a great help, but in the course of the experiment, some students do not regulate the operation of a small damage to the instrument, which is largely a threat to the safety of students. The following violations are often encountered by students: First, the use of test tubes illegally 1. The outer wall of the test tube heated directly heated when the test tube rupture. 2. Heating without preheating directly to a point of heating, so that the tube burst. 3. Heating test tube liquid over one third of the volume, and the nozzle facing the people, liquid splashes, hurt people.