化学实验要能吸引学生的注意力,激发学生的学习兴趣,一般要具备以下条件:一是实验现象要吸引眼球;二是实验内容要是学生感兴趣的现实问题。在义务教育教科书九年级化学(沪教版)中有如下实验存在不足。1.在验证浓硫酸特性的演示实验中蔗糖慢慢变黑,不仅耗时较长,而且容器壁上黏附的炭也不容易清洗。2.燃烧引起的爆炸实验有两个,其中在面粉的爆炸实验中受面粉材质的制约,成功率较低;在电解 Chemical experiments to be able to attract students ’attention and stimulate students’ interest in learning, generally have the following conditions: First, the phenomenon of the experiment to attract the eye; Second, the content of the experiment if students are interested in practical problems. In the compulsory education textbook ninth grade chemistry (Shanghai Education Edition) in the following experiments there are deficiencies. 1. Demonstration of concentrated sulfuric acid to verify the performance of the experiment sucrose slowly black, not only takes longer, and the container wall adhesion of carbon is not easy to clean. There are two experiments of explosion caused by combustion, of which the flour explosion experiment is limited by the flour material, the success rate is low; in electrolysis