一、从实效出发,尽量把工作做细在教学中,我们还注意抓容易混淆的一些概念:如元素、原子、离子,溶解性与溶解度,溶解度与百分比浓度,电离、电解、电镀,原电池与电解池,鉴定和鉴别,区别或分别认识,推断或论证等,我们都注意揭示本质,交待规律,引导学生积极思考,彻底弄清,学生遇到BaSO_4往往认为它们难溶于水,一定是弱 First, starting from actual results, try to do a good job in teaching, we also pay attention to some concepts that are easily confused: such as elements, atoms, ions, solubility and solubility, solubility and percentage concentration, ionization, electrolysis, electroplating, primary battery With the electrolytic cell, identification and identification, differentiation or understanding, inference or argumentation, etc., we all pay attention to reveal the nature, explain the laws, guide students to think positively, and thoroughly understand. When students meet BaSO4, they often think that they are difficult to dissolve in water. weak