论文部分内容阅读
我们对高一教材中学生实验十“分子量的测定”进行了若干次试验,初步找到了产生误差的原因和应采取的措施,在实验方法上作了一些改进。现介绍如下。一、实验用品。除教材上所述的实验用品外,增加毫克砝码、表面皿、温度计、钻孔硬纸板盖、粉笔匣。把石棉铁丝网改为无石棉的铁丝网或泥三角。二、实验中应采取的措施及注意事项。 1.加热烧杯中的热水时,烧杯口应盖上表面皿;用无石棉的铁丝网或泥三角代替石棉铁丝网,以缩短加热时间。
We conducted a number of experiments on the “Determination of Molecular Weight” in Experiment 10 of High School Textbook for Primary School Students, initially found out the reasons for the error and the measures to be taken, and made some improvements in the experimental methods. Now introduced as follows. First, experimental supplies. In addition to the experimental materials described in the textbook, add milligram weight, watch glass, thermometer, drill cardboard lid, chalk box. Change asbestos barbed wire to asbestos free barbed wire or clay triangle. Second, the experiment should take measures and precautions. 1. When heating the hot water in the beaker, the beaker should be covered with a watch glass; asbestos barbed wire should be replaced with asbestos-free wire or mud triangle to shorten the heating time.