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Fav十万个为什么
为什么没擦干的小刀放在火上一烤会变蓝？
没擦干的小刀放在火上一烤会变蓝，主要是因为刀面上的水在高温下与铁发生氧化反应，生成了蓝色的氧化铁。
1、水在高温下与铁发生反应：当小刀没有擦干就放在火上烤时，刀面的水分会迅速蒸发，并与炽热的铁发生反应。
2、生成氧化铁：这个反应的化学方程式通常可以表示为 3Fe + 4H2O 高温 . Fe3O4 + 4H2，生成的四氧化三铁（Fe3O4）是一种蓝色的化合物。
3、氧化铁附着在刀面：生成的氧化铁会附着在小刀的表面，形成一层蓝色的薄膜，因此小刀看起来变蓝了。
总结：没擦干的小刀放在火上一烤会变蓝，主要是因为刀面上的水在高温下与铁发生氧化反应，生成了蓝色的氧化铁。
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