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化学是一门以实验为基础的学科,它是生命科学的指南,是能源开发的根本,是环境保护的领袖。它通过教师演示实验或组织学生亲手实验操作,能把书本知识由微观变为宏观,把抽象变成具体,变无形为有形。本人教学有年,积累浅见些许,列举如下,希望同仁共同商榷。一、利用反应物的接触面积扬利避害先了解可燃物的燃烧现象:燃烧指可燃物与氧气发生的一种发光、放热的剧烈的氧化反应。燃烧必须同时具备三个条件:1.可燃物;2.氧气;3.达到燃烧所需的最低温度(也叫着火点)。其中着火点是物质的一种属性,不可改变。那么,改变可燃物的状态,或增大可燃物与氧气的接触面积就可以使燃烧更符合
Chemistry is an experiment-based discipline, a guide to life sciences, a fundamental energy development, and a leader in environmental protection. It demonstrates the experiment by teachers or students hands-on experimental operation, can change the book knowledge from the micro into the macro, the abstract into a concrete, change intangible to tangible. I have teaching years, the accumulation of a humble opinion, cite below, I hope my colleagues to discuss. First, the use of reactant contact area Yang avoidance First understand the combustion of combustibles: Combustion refers to a combustible and oxygen occurs a glowing, exothermic violent oxidation reaction. Combustion must have three conditions at the same time: 1 combustible; 2 oxygen; 3 to achieve the minimum temperature required for combustion (also called the ignition point). One of the ignition point is a material property, can not be changed. Then, changing the state of the combustibles or increasing the contact area of combustibles with oxygen can make the combustion more in line with