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初中化学用语中各种数字所代表的意义不尽相同。学生往往会因为不理解符号表示的意义而难以回答,下面用拟人的方法帮助大家理解它们的意义。1.左边站的是微粒的个数:1)元素符号左边站的是几,表示几个某原子。如:2H系数“2”表示2个氢原子2)化学式左边站的是几,表示几个某分子。
The meanings represented by various numbers in junior high school chemistry are not the same. Students often find it difficult to answer because they do not understand the meaning of symbolic expressions. The following method is used to help people understand their meaning. 1. The number of particles on the left station: 1) The number of stations standing on the left of the symbol indicates several atoms. Such as: 2H coefficient “2” represents two hydrogen atoms 2) The chemical formula stands on the left side, which represents several molecules.