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化学演示实验必须做到准确无误、万无一失,才能在教学中发挥其作用,为了增强化学演示实验教学效果,让演示实验在教学中充分发挥作用,笔者就如何优化化学演示实验教学谈几点粗浅见解。 一、突出实验现象 实验现象鲜明突出,便于学生观察,易于吸引学生注意力,激发学生学习化学知识的兴趣,调动学生学习的积极性,学生也能对知识加深认识和产生求知欲。突出实验现象的方法很多,如用试剂最佳配量来突出实验现象:初三化学(实验4-3),40毫升浓硫酸溶于100毫升水中,改为53.3毫升浓硫酸溶于180毫升水中,可使温度升高到81℃。通过改变剂量配比,达到试剂
Chemical demonstration experiment must be accurate and foolproof to play its role in teaching. In order to enhance the effectiveness of chemical demonstration experiment teaching, let the demonstration experiment play a full role in teaching, the author on how to optimize chemical demonstration experiment teaching to talk about a few superficial insights . First, to highlight the experimental phenomenon The experimental phenomenon is prominent, easy for students to observe, easy to attract the attention of students, stimulate students interest in learning chemical knowledge, mobilize the enthusiasm of students to learn, students can also deepen their knowledge of knowledge and generate curiosity. There are many ways to highlight the experimental phenomenon, such as highlighting the experimental phenomenon with the best dosage of reagents: Junior Chemicals (Experiment 4-3), 40 ml of concentrated sulfuric acid dissolved in 100 ml of water, and 53.3 ml of concentrated sulfuric acid dissolved in 180 ml of water The temperature can be raised to 81 °C. Reach reagents by changing the dose ratio