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中学教材中浓硫酸与蔗糖的演示实验,能直观形象地为学生的学习提供感性材料。但由于实验条件、安全等因素影响,该演示实验的功能得不到充分发挥,在实际操作过程中存在以下不足之处:药品用量过多,资源浪费;产生的大量刺激性气体没有进行处理,污染环境;若使用的浓硫酸浓度过低,反应现象不明显,实验中只能得到黑褐色黏稠物,难以形成疏松多孔的海绵状碳,导致实验失败。针对以上问题,为了提高演示实验教学效果,在大量
Secondary high school teaching materials in the demonstration of sucrose and sucrose experiment, visual image to provide students with sensitive material. However, due to the influence of experimental conditions, safety and other factors, the function of the demonstration experiment can not be brought into full play. In actual operation, the following deficiencies exist: excessive drug consumption and waste of resources; a large amount of irritating gas generated is not processed; Pollution of the environment; if the concentration of concentrated sulfuric acid is too low, the reaction was not obvious, the experiment can only get dark brown sticky, difficult to form loose porous sponge-shaped carbon, leading to experimental failure. In view of the above problems, in order to improve the demonstration experiment teaching effect, a large number