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一、明确概念的内涵和外延每一个概念都有它们的内涵和外延。内涵是指一个概念所确定的本质属性的总和,外延是指一个概念所确定的对象范围。内涵是掌握概念的关键,外延是激发学生思维的“催化剂”。例如:固体物质的溶解度概念的内涵:“一定温度,100克溶剂,达到饱和状态,溶解溶质质量”定义的外延指“一切可以在水中能溶解的物质。”又如:催化剂概念的内涵是“能改变其它物质的反应速度,本身的质量和化学性质在反应前后都没有改变”。概念的外
First, define the concept of connotation and extension Each concept has its connotation and extension. Connotation refers to the sum of the essential attributes determined by a concept. Extension refers to the range of objects defined by a concept. Connotation is the key to mastering concepts, and extension is the “catalyst” that stimulates students’ thinking. For example: the concept of solid material solubility: “a certain temperature, 100 grams of solvent, reaching saturation, dissolved solute quality” defined extension refers to “everything that can be dissolved in water.” Another example: catalyst concept The connotation is that “it can change the reaction speed of other substances, and its quality and chemical properties have not changed before and after reaction.” Outside the concept