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全日制十年制初中化学课本第143页有下面一道习题:“使0.23克钠跟水起反应,能生成多少升的氢气(标准状况)?”这道习题,为什么要安排在教材上没有讲授气体摩尔体积之前的初中化学课本里呢?我们考虑有两方面的原因。第一:要我们重视物质物理性质上关于物质密度这一基本概念的教学。第二:为高中化学关于气体摩尔体积的教学作了内在的准备。以利于我们运用同学们已知的知识导入新课内容,进行启发式教学。
The full-time, 10-year, junior high school chemistry textbook on page 143 has the following exercise: “How many liter of hydrogen can be produced by reacting 0.23 grams of sodium with water (standard condition)?” This exercise is why it is arranged in the textbook. There are two reasons why we did not teach junior high school chemistry textbooks before the gas molar volume. First, we must pay attention to the teaching of the basic concept of material density in the physical properties of matter. Second: Intrinsic preparation for high school chemistry teaching about the molar volume of gas. In order to help us use the knowledge known by our classmates to introduce new lessons and conduct heuristic teaching.