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综观近年各地中考化学题,化学计算普遍降低了计算难度。但综合计算是中考必考题型之一,各地的中考试题中,往往创设与生活和实践相关的新情景,将题目条件巧妙地以分析数据、图表和图像形式出现,重点考查同学们分析推理能力及提炼信息解决问题的综合思维能力。综合计算的基本类型:(1)相对原子质量、相对分子质量与化学方程式的综合计算;(2)有关溶液与化学方程式的综合计算;(3)有关某物质纯度的计算。综合计算题型复杂,其中有关溶液与化学方程式的综合计算是各地
In recent years, taking a comprehensive examination of chemical examinations, chemical calculations generally reduce the calculation difficulty. However, the comprehensive calculation is one of the exam questions in the exam. Among the middle school exam questions, new situations often related to life and practice are often created. The topic conditions are subtly presented in the form of analytical data, charts and images. The focus is on students’ ability of analyzing reasoning And refining information to solve the problem of comprehensive thinking ability. Comprehensive calculation of the basic types: (1) relative atomic mass, relative molecular mass and chemical equation of the comprehensive calculation; (2) the solution and the chemical equation of the comprehensive calculation; (3) on the purity of a substance. Comprehensive calculation of the type of questions, in which the comprehensive calculation of solution and chemical equation is around