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人教版化学教材必修1第三章“金属及其化合物”第一节“金属的化学性质”第48页实验:将铝箔在空气中加热融化但不滴落,其原因是Al与O2可以形成致密的氧化物薄膜Al2O3,且Al2O3熔点远高于Al。将氧化物薄膜用砂纸打磨后重复操作,现象仍为加热融化但不滴落,教师试图说明Al与O2能快速反应,但学生往往理解为Al与O2很难反应。为此,笔者通过以下实验尝试改进。
PEP Teaching Chemistry 1 Chapter 3 “Metal & Its Compounds ” Section “Chemistry of Metal ” p. 48 Experiment: The aluminum foil is melted by heating in the air but does not drip. The reason for this is that Al With O2 can form a dense oxide film Al2O3, and Al2O3 melting point much higher than Al. After polishing the oxide film with sandpaper and repeating the operation, the phenomenon is still melted by heating but does not drip. The teacher tries to show that Al and O2 can react rapidly, but students often understand that Al and O2 hardly react with each other. To this end, I try to improve through the following experiment.