化学实验的演示是化学教学中的重要方法之一。因为通过演示实验可以使学生顺利地形成化学的基本概念,认识物质变化的本质、转变的条件和变化的规律,而且能使学生对于理性知识确信其真实性。所以,作为一个化学教师在讲课时应该千方百计尽可能多做演示实验。中学化学教材“接触法制硫酸”所用的催化剂是五氧化二钒或钒,但是,目前有很多学校,尤其是农村中学设备较差,没有五氧化二钒,那么,如何来解决课堂 Demonstration of chemical experiments is one of the important methods in chemistry teaching. Because the demonstration experiment can make students successfully form the basic concepts of chemistry, recognize the essence of material change, the conditions of change and the law of change, and make students be convinced of the authenticity of rational knowledge. So, as a chemistry teacher, you should do everything possible to do as much as you can during your lecture. High school chemistry textbook “contact with legal system sulfuric acid” catalyst used is vanadium pentoxide or vanadium, but at present there are many schools, especially in rural secondary school equipment is poor, there is no vanadium pentoxide, then how to solve the classroom