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1 改进目的1 1 中学化学教材中苯的溴代反应的装置、试剂和操作存在下列不足 :1 1 1 液溴与苯的体积比 (1∶2 )过高 :表面积极大的还原铁粉作催化剂 ,反应一旦发生将异常剧烈。若铁粉的用量过多、加入顺序不当 ,有时会使反应液喷出 ,造成事故。1 1 2 实验设计不严密 :剧烈
1 Improvement purpose 1 1 The brominated reaction devices, reagents and operations in middle school chemistry textbooks have the following deficiencies: 1 1 The volume ratio of liquid bromine to benzene (1:2) is too high: the reduced iron powder with a very large surface area The catalyst will react abnormally once it occurs. If the amount of iron powder is too much and the order of addition is improper, the reaction solution may sometimes be sprayed and cause accidents. 1 1 2 The experimental design is not strict: dramatic