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化学实验基本操作作为实验内容的考查重点,引起了许多同学的关注。因教材内容“零而碎、繁而杂”,有些同学虽然用了不少时间去理解、记忆这部分内容,但收效甚微。为此,本文对一些重要的实验基本操作要点进行归类,以供同学们参考。一、常用仪器的使用要点1.量筒的使用一平二看三读。即:放平稳、看量程、凹面低处视线平;仰视量少实际多,俯视量多实际少。(说明:看量程是指所选用量筒的容量要与所量取的液体体积相匹配。)
The basic operation of chemistry experiments as the focus of the examination of experimental content has attracted the attention of many students. Because the content of the teaching materials was “zero-breaking, complex, complicated and miscellaneous,” some students used a lot of time to understand and remember this part of the content, but they had little effect. For this reason, this article categorizes some important basic operating points for students’ reference. First, the use of common instruments points 1. The use of graduated cylinders to see the third reading. That is: smooth, look at the range, low line of sight at the concave surface; the amount of looking up is less, and the amount of looking down is much less. (Note: To see the measuring range means that the volume of the measuring cylinder selected matches the volume of the liquid to be measured.)