作为基本技能的考核,化学计算是高考化学试卷中的龙头.思考容量大,难度高的计算题常是全卷的压轴题,这是用来提高试卷的测试信度和区分度的重要举措.历年高考中考生在化学计算题的解题失误(?)多,失分率很高,其中一部分原因是考生对题中数据理解有误,盲目取用.故须慎审细查题中数据,急望考生不得轻心. As a basic skill assessment, chemical calculation is the leading factor in the college entrance examination chemistry examination paper. Thinking volume is large, and difficult calculation problems are often full-length finale questions. This is an important measure to improve test reliability and differentiation of test papers. The candidates for the college entrance examinations over the years have had many problem-solving errors (?) in the chemistry calculation problem, and the scores are very high. Part of the reason is that the examinees have misunderstood the data in the questions and blindly take them. Therefore, the data in the questions must be carefully examined. We hope that candidates will not be lightly.