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有关溶质的质量分数计算问题是教学中的重点,也是学生学习的难点,同时更是中考化学考查的重要内容.计算所涉及的题目多,运算量大,学生在学习中容易产生畏难情绪.如果教学中能引导学生按不同题型学习,将起到事半功倍的效果.一、已知溶质和溶剂的量,求溶质的质量分数此类题目只要理解溶质的质量分数概念,通过阅读题目提取已知量、未知量,并通过对溶质的质量分数求解公式进行适当变形,就能快速解答.
The calculation of mass fraction of solutes is the focus of teaching, but also difficult for students to learn, but also an important part of the examination of the senior high school entrance examination. Calculation involves many topics, large amount of computation, students are prone to fear in learning. Teaching can guide students according to different types of learning, will play a multiplier effect. First, the known amount of solute and solvent, and solute the mass fraction of Such questions as long as the understanding of solute mass fraction concept, by reading the known extraction Amount, unknowns, and by solute mass fraction formula for the appropriate deformation, you can quickly answer.