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1.产生背景:在做碘的升华和凝华实验时,实验结束后,试管(或烧瓶)大多未清洗。2.原因:碘的蒸气有毒,能够剧烈地刺激人的口腔和鼻腔粘膜,吸入过多,则易中毒死亡。部分胆小、谨慎的学生怕出意外,故意省略了此步骤。3.引出的探究问题:能否把该实验器材做成永久的、安全的实验仪器?4.改进创新方法:将少量碘固体放入干净的细颈试管(或烧瓶)底部,用酒精喷灯将试管(或烧瓶)口的玻璃熔
1. Background: In the sublimation and desublimation experiments of iodine, after the end of the experiment, the test tubes (or flasks) were mostly not cleaned. 2. Reason: Iodine vapor is toxic and can strongly stimulate people’s oral and nasal mucous membranes. If they inhale too much, they are easily poisoned and die. Some of the timid, discreet students feared accidents and deliberately omitted this step. 3. Exploratory questions elicited: Can the experimental equipment be made as a permanent, safe laboratory instrument? 4. Improved innovative methods: Place a small amount of iodine solids in the bottom of a clean, thin-necked test tube (or flask) with an alcohol torch. Glass melting of the test tube (or flask)