高一教材中铁与硫的反应是这样做的：将５g铁粉（还原铁粉）与５g硫粉混合均匀，装在试管里，并平铺成为一薄层，然后将试管固定在铁架台上（见图１），加热试管底部，看到底部药品红热后立即把酒精灯移开，观察发生的现象。我们认为，该实验操作虽然简单，现象也很明显，但是 The reaction of iron and sulfur in the first grade textbook is done by mixing 5g of iron powder (reduced iron powder) with 5g of sulfur powder, placing it in a test tube and flattening it into a thin layer, and then fixing the tube on the iron stand. (See Figure 1). Heat the bottom of the tube and remove the alcohol lamp immediately after seeing the red heat from the bottom of the tube. Observe the phenomenon. We believe that the experimental operation is simple and the phenomenon is obvious, but