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概念是反映客观事物的最本质的特征和联系的东西,它是通过其有关的字词或语句表达出来的。正如《初中化学课程标准》中所说的:化学概念是课程内容的重要组成部分,是化学知识的“骨架”。抽象的化学概念往往使学生望而生畏。因此,应从学生熟悉的、身边的真实现象导入,使学生从感知概念到形成概念;而且在教材中引出概念不仅是为了知识表述的简约性,更重要的是通过概念启迪学生进一步思维,拓宽知识视野,建立相关知识之间的联系,运用已
Concept is the most essential feature of the objective things and contact things, it is through their related words or phrases to express. As stated in the Junior Middle School Chemistry Curriculum Standard: The chemical concept is an important part of the course content and is the “skeleton” of chemical knowledge. Abstract chemical concepts often make students daunting. Therefore, students should be familiar with the real phenomenon around to import, so that students from the concept of perception to the formation of concepts; and in the textbook leads to concepts not only for the simplicity of knowledge representation, more importantly, to enlighten students through the concept of further thinking and broaden their knowledge Vision, the establishment of the link between knowledge, use has been