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一、深刻理解化学基本概念,切实加强化学基本概念的教学。 1、首先帮助学生深刻理解概念的定义。例如讲解酸性氧化物这一概念,其定义是:“凡能跟碱起反应生成盐和水的氧化物叫做酸性氧化物。”这定义反映了概念所包括的一切对象的本质属性是与碱反应生成盐和水。这就决定了这概念的范围是成盐的非金属氧化物,如SO_2、SO_3、CO_2、P_2O_5等,而不成盐的非金属氧化物如NO、CO等则不属这一类。又如讲授固体物质的溶解度,其定义的本质属性则包括“一定温度”、“100克溶剂”、“达到
First, profoundly understand the basic concepts of chemistry and effectively strengthen the teaching of basic concepts of chemistry. First, help students understand the concept definition. For example, to explain the concept of acidic oxides, the definition is: “The oxides that react with alkali to form salts and water are called acidic oxides.” This definition reflects that the nature of all the objects covered in the concept is the reaction with alkali. Generates salt and water. This determines the scope of this concept is the formation of salt non-metal oxides, such as SO2, SO3, CO2, P2O5, etc. Non-salt non-metallic oxides such as NO, CO, etc. do not belong to this category. Another example is to teach the solubility of solid materials. The essential attributes of the definition include “a certain temperature”, “100 g of solvent” and “reach