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铝与稀盐酸反应实验和铝与硫酸铜溶液反应实验是人教版九年级化学“金属和金属材料”一节中的两个重要实验,这两个实验均存在反应现象慢、难以得出正确结论的问题,为此,笔者进行如下改进。一、铝与稀盐酸反应实验的改进1.实验不足之处。用铝片做该实验根本无法很快看到所需要的现象。因为在铝片表面生成了一层致密的氧化膜,用砂纸很难打磨铝片上的氧化膜,而氧化膜与稀盐酸反应又需要比较长的时间,在短时间
Aluminum and dilute hydrochloric acid reaction experiment and aluminum and copper sulfate solution reaction experiment is the human religion version of the ninth grade chemistry “metal and metal materials, ” one of the two important experiments, both experiments there are slow reaction phenomenon, it is difficult to get Correct conclusions of the problem, for which, I make the following improvements. First, the improvement of aluminum and dilute hydrochloric acid reaction experiment 1. Experimental deficiencies. The experiment with aluminum sheet simply can not see the desired phenomenon. Because a dense oxide film is formed on the surface of the aluminum sheet, it is difficult to polish the oxide film on the aluminum sheet with the sandpaper, and the oxide film and the dilute hydrochloric acid take a relatively long time to react. In a short time