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1.看清题目要求的有效数字,注意平衡常数的单位。2.解题过程要简化,熟练使用计算技巧。3.首先清楚题意,不要先入为主、机械记忆地作答。阅卷实例分析一、注意有效数字和单位高考化学第26题属于热力学、动力学和化学平衡计算题,依据基本理论进行分析、判断和计算,在3道必考题中最简单。在此要强调两点:1.本题提供的有效数字位数为两位(如0.020、0.080)或三位(如0.100、0.120),计算结果保留的位数和最少的位数(两位)一致(如答案中的0.0010、0.36、1.3),位数保留过多或过少都是不确切的。
1. To see the effective number of questions required, pay attention to the unit of equilibrium constant. 2. Problem-solving process should be simplified, skilled use of computing skills. 3 first clear questions, do not preconceived, mechanical memory to answer. Scoring example analysis First, pay attention to the effective number and unit Entrance Chemistry 26th issue belongs to thermodynamics, kinetics and chemical balance calculation, based on the basic theory of analysis, judgment and calculation, the three exam questions will be the most simple. Here are two points to emphasize: 1. The number of valid digits provided by this question is two digits (such as 0.020,0.080) or three digits (such as 0.100,0.120). The number of digits and the minimum number of digits (two digits) Consistent (such as the answer of 0.0010,0.36,1.3), the number of bits reserved too much or too little are not precise.