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初中化学全一册编入了一些学生讨论题,教学时,教师不可越俎代疱,直接作答,要注意引导学生联系实际,或阅读课本自己作答,以利培养他们学习化学的兴趣。1.第20页[讨论]:“根据可燃物燃烧的条件,你怎样使火熄灭?”教师可引导学生回顾在家里是怎么生火的,怎么灭火的,让学生联系实际作答,并归结为:只需破坏可燃物燃烧的两个条件中的任何一个,火就会熄灭。2.第86页[讨论]:“……不管它是从什么地方取来的水,……或者在实验室中用人工方法制得的水,所含氢元素和氧元素的质量都是一定的,即 H:O=1:8。请你用已学到的物质结构的初步知识加以解释。
The junior high school chemistry consists of a number of student discussion questions. When teaching, teachers should not be asked to answer questions directly. They should pay attention to guiding students to contact with the actual situation or reading textbooks to answer questions in order to facilitate their interest in learning chemistry. 1. Page 20 [Discussion]: “How do you extinguish a fire according to the conditions of combustible burning?” The teacher can guide the student to review how the fire was made at home and how to extinguish the fire. Ask the student to contact the actual answer, which boils down to: Only one of the two conditions of combustible burning will be destroyed and the fire will go out. 2. Page 86 [Discussion]: "... no matter where it is taken from water, ... or artificially prepared water in the laboratory, the quality of hydrogen and oxygen contained in the water is constant. , that is, H:O=1: 8. Please explain with the preliminary knowledge of the material structure you have learned.