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上海市重点中学理科班教材,根据部颁《全日制十年制学校中学化学教学大纲(试行草案)》的规定,增添了学生实验“阿佛加德罗常数的测定”。 这种比较复杂的定量实验,以前很少碰到,开始时我们怕测出常数的误差太大,这个实验 做不好。后来我们摸索着做了几次试验,并掌握了本实验成败的关键,因此课堂教学中做学生实验时,测定也取得了较好的效果。我校三个理科班学生测定阿佛加德罗常数的数据(N×10~(28))如下:
The teaching materials of science classes for key middle schools in Shanghai were added to the student experiment “Determination of Avogadro’s constants” in accordance with the regulations of the Ministry of Education on “The Chemistry Curriculum for Secondary Schools and 10-year Secondary Schools (Trial Draft)”. This relatively complicated quantification experiment was rarely encountered before. We were afraid that the error of the measured constant was too great at the beginning. This experiment did not work well. Later, we fumbled for several trials and mastered the key to the success or failure of the experiment. As a result, the student’s experiment in classroom teaching also achieved good results. The data of the Avocadero constants (N×10~28) measured by the three science students of our school are as follows: