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化学计算题是化学知识的重要组成部分,计算中往往会碰到一类无数据或缺少数据的题型。此类题用常规解法往往难以解决,不妨另辟蹊径,灵活运用不同的化学思想,变换角度、巧妙分析、认真思考即可形成不同的求解思路。一、试题特点1.整道题无一个数据,全是文字叙述,但其结果要求用数据来解答。2.在题干部分提供有关元素化合物的信息,给出一些组成相关的物质(化学式)或化学反应事实(化学方程式),将解题所必要的数据隐含在这些化学符号中。3.题中常给出“前后不变”“相同”“相等”等字眼,
Chemistry calculation is an important part of chemical knowledge, calculation often encounter a class of no data or lack of data questions. Such problems with the conventional solution is often difficult to solve, may wish to find another way, the flexibility to use different chemical ideas, changing perspectives, ingenious analysis, serious thinking can form different ideas for solving. First, the characteristics of the test questions 1. There is no whole series of questions, all the text description, but the results require data to answer. 2. Provide information on the elemental compounds in the title section, and provide information on the composition of the substance (chemical formula) or chemical reaction (chemical formula), implicit in the chemical symbols for the data necessary to solve the problem. 3 questions often given “before and after the same ” “” “” equal "and other words,