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综合性计算题是指化学方程式计算和溶质的质量分数计算相融合的计算题.其特点是先根据化学方程式计算出相关物质的质量,然后再计算出有关溶液溶质的质量分数,一般是中考试卷的最后一道大题.由于此类题综合性较强,所以在命题时必须慎重.尽管如此,每年都有一些省市的中考计算题出现科学性错误,现举两例2013年中考计算题,从命题的科学性角度分析加以分析说明,目的是引起命题者的反思,切实提高命题的科学性.
Comprehensive calculation of the problem refers to the calculation of chemical equations and solute mass fraction calculation of the integration problem.Its characteristic is the first chemical formula based on the calculation of the quality of related substances and then calculate the solute mass concentration of the solution, Because of the comprehensiveness of such questions, so the proposition must be careful.Even so, every year, some provinces and cities in the senior high school entrance examination questions appear scientific error, citing two 2013 college entrance examination questions, Analysis from the perspective of scientific analysis of propositions to explain, the purpose is to cause the reflection of the proposition, and effectively improve the scientific proposition.