课堂上教师先分别测定蒸馏水、稀硫酸、氢氧化钡溶液、硫酸钡悬浊液的电导率,然后提出:如果在该氢氧化钡溶液中逐滴滴加稀硫酸,混合物的电导率会如何变化?在学生猜想后,师生共同探究该实验。从实验结果的图像中,学生发现猜想部分正确,部分存在错误,在师生共同讨论后,学生豁然开朗,课堂达到高潮。课堂教学有序、有新意,还提高了学生的思维品质。 Class teachers were first measured in distilled water, dilute sulfuric acid, barium hydroxide solution, barium sulfate suspension conductivity, then proposed: If the barium hydroxide solution was added dropwise sulfuric acid, the conductivity of the mixture will change After the students guess, teachers and students to explore the experiment. From the images of the experimental results, the students found that the conjecture was partly correct and partly erroneous. After the teachers and students discussed together, the students suddenly realized that the classroom reached its climax. Classroom teaching orderly, innovative, but also improve the quality of student thinking.