非金属元素硫在中学教材中作为重点元素学习,它的化合物也是学生们比较熟悉的内容,如硫酸、硫酸盐、硫的氧化物等。硫的氧化物包含S2O、S2O3、SO2、SO3、S2O7和SO4等多种,其中SO2和SO3是中学化学教材中重点介绍的两种硫的氧化物。SO2在通常状况下为无色有刺激性气味的气体,而SO3在通常状况下的状态却常常被学生搞错,解决问题时,学生经常误以为是气体。依据中学教材中的编注,SO3的熔点为16.8℃,沸点为44.8℃。 Non-metallic elemental sulfur in secondary school textbooks as a key element of learning, its compounds are also more familiar to students, such as sulfuric acid, sulfate, sulfur oxides. Sulfur oxides include S2O, S2O3, SO2, SO3, S2O7 and SO4 and many other kinds, of which SO2 and SO3 are secondary oxides introduced in the textbook of secondary chemistry. SO2 is a colorless and irritating gas under normal conditions. However, SO3 is often mistaken for students under normal conditions. Students often mistakenly think gas when solving problems. According to the middle school textbook editor, SO3 melting point of 16.8 ℃, the boiling point of 44.8 ℃.