化学是一门以实验为基础的科学,以实验为基础展开化学教学已成为所有化学教学工作者的共识。初中化学中的有些实验,如按教材中的常规做法,不仅现象不很明显、消耗时间较长,而且不少实验还会产生有毒气体,对环境造成污染。巧妙地利用注射器,对实验进行改进,虽然已经有许多化学教师进行了研究,如用作集气瓶、量筒、滴管、分液漏斗、烧杯等常用仪器的代用品;也可改变容器内的压强,如检查装置的气密性、研究压强等对化学反应的影响等,但结合自己的教学实际,为了最大限度地发挥仪器 Chemistry is an experiment-based science. Experiment-based chemistry teaching has become the consensus of all chemistry teaching workers. Some experiments in junior high school chemistry, such as teaching materials by conventional practices, not only the phenomenon is not obvious, longer time consuming, and many experiments will produce toxic gases, causing pollution to the environment. Clever use of syringes to improve the experiment, although many chemical teachers have been studied, such as the collection of gas bottles, measuring cylinders, dropper, separatory funnel, beakers and other commonly used instruments substitute; also can change the container Pressure, such as checking the airtightness of the device, studying the effects of pressure on the chemical reaction, etc., but in light of their own teaching practice, in order to maximize the instrument