实验操作考试前的一天下午,李丽和她的小伙伴们在实验室里进行模拟训练。在她和本组的杨婧同学把打磨好的铝片放入盛有硫酸铜溶液的试管里观察金属与盐溶液反应的现象时,她们看到铝片一下子沉到试管的底部,同时其表面的颜色也在变红、变暗,由此她们再次体会到活泼金属是能将不活泼金属从其盐溶液里置换出来的。 One day before the experiment operation exam, Li Li and her friends conducted simulation training in the laboratory. When she and her classmate Yang Jing polished the aluminum piece into a test tube filled with cupric sulfate solution and observed the reaction of metal and salt solution, they saw the aluminum piece sink to the bottom of the test tube at the same time The color of the surface is also reddish, dark, so they once again realized that the lively metal is able to displace the inactive metal from its salt solution out.