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学习溶液知识时,老师组织学生进行了制取大块硫酸铜晶体的课外趣味实验。结果很意外:学生制得的硫酸铜晶体都很小,与大块硫酸铜晶体标本相去甚远。提出问题什么条件影响制取的硫酸铜晶体的大小?做出猜想制取的硫酸铜晶体的大小受晶核材质、介质、降温速度、杂质四个条件的影响。进行实验采用控制变量法,分四个小组开展实验研究。第一组研究晶核材质对晶体形成的影响。在四个烧杯中分别加入50m L80℃~90℃的热水,然后各加入35g~40g研细的硫酸铜晶
When learning about solution knowledge, the teacher organized the students to conduct extra-curricular fun experiments to produce large copper sulphate crystals. The result was very unexpected: students made copper sulfate crystals are small, with a large copper sulfate crystal specimens far apart. Ask questions What conditions affect the size of copper sulfate crystals produced? Make a guess that the size of the copper sulfate crystals by the crystal material, media, cooling rate, impurities four conditions. Experimental control variable method, divided into four groups to carry out experimental research. The first group investigates the effect of crystal material on crystal formation. In four beakers were added 50m L 80 ℃ ~ 90 ℃ hot water, then add 35g ~ 40g fine copper sulfate crystals