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课外实验不仅可以帮助学生加深理解化学概念,巩固所学的化学知识,提高学生的能力,还能培养学生实事求是,严肃认真的科学态度和爱国情感。这可以通过“Fe_3O_4的制备”的兴趣小组活动过程来说明。一、活动课题的选定在教过铁的有关性质后,我曾组织高三化学兴趣小组的学生,先按课本文中演示实验的要求作实验。在含有Fe~(2+)的溶液中滴入碱溶液,立即生成白色胶状Fe(OH)_2沉淀,它在空气中极易被进一步氧化而转化
Extracurricular experiments can not only help students to deepen their understanding of chemical concepts, consolidate their knowledge of chemistry, improve students 'abilities, but also develop students' pragmatic, serious and scientific attitude and patriotic feelings. This can be illustrated by the process of interest group activity “Preparation of Fe_3O_4”. First, the selection of the subject of activities After teaching about the nature of iron, I had organized the third year chemistry interest group of students, according to the text of the demonstration experiment requirements for experiments. Alkali solution was dropped into the solution containing Fe ~ (2+) to produce a white colloidal Fe (OH) _2 precipitate, which was easily oxidized and transformed into air