在中学化学教学中 ,常发现学生写出一些似是而非的化学方程式。如何才能正确书写这类化学方程式 ,是教学中的一个难点。造成错误的原因是多方面的 ,现将常见的具有代表性的错误分析如下 :　　 [方程式一 ]实验室制取二氧化碳的反应ＣａＣＯ3 +Ｈ2 ＳＯ4ＣａＳＯ4+ＣＯ2 ↑ +Ｈ2 In chemistry teaching in middle schools, students are often found to write some plausible chemical equations. How to correctly write this kind of chemical equation is a difficult point in teaching. The causes of the errors are many, and the common representative errors are now analyzed as follows: [Equation 1] The reaction of carbon dioxide produced by the laboratory CaCO3 + H2 SO4CaSO4 + CO2 + H2