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从上表可知,测出阿佛加德罗常数的数值在5×10~(23)～7×10~(23)的人数占总人数的89.4%,可见学生做这个实验是可以取得较好成绩的。二、实验教学过程: (一)讲清基本原理硬脂酸苯溶液滴到水面时,为什么会形成单分子膜?硬脂酸是一种高级脂肪酸,分子式为C_(17)H_(35)COOH,它能溶于苯,难溶于水,而苯难溶于水,易挥发。因此,将硬脂酸的苯溶液滴到水面时,硬
As can be seen from the above table, the number of people who measured the Avogadro constant in the range of 5×10 23 to 7×10 23 accounted for 89.4% of the total number. It can be seen that students can do better in this experiment. Achievements. Second, the experimental teaching process: (A) explain the basic principles stearic acid benzene solution drops to the surface, why will form a monomolecular film? Stearic acid is a higher fatty acid, molecular formula C_ (17) H_ (35) COOH It is soluble in benzene and hardly soluble in water, while benzene is insoluble in water and volatile. Therefore, when the benzene solution of stearic acid is dropped on the water, it is hard