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在全国的高考化学试卷和近几年来的高考理综化学试题中,选择型计算题都占很大的份量。尽管选择题计算题形式各不相同,但是笔者发现很多是“形变神不变”。如何巧解计算型选择题,本文就这一问题谈谈自己的看法。供同学们学习参考。一、巧用“双基”回归教材【例1】已知t℃时,某物质的不饱和溶液a克,若蒸发b克水并恢复到t℃析出溶质M_1
In the national college entrance examination chemistry examination paper and the college entrance examination comprehensive chemistry chemistry examination questions in recent years, the selection calculation questions all occupy a large amount of weight. Although the form of the multiple-choice questions is different, the author finds that many of them are “unchanged.” How to cleverly solve a computational multiple choice question, this article talks about one’s own opinion on this question. For students to learn reference. First, the use of “double base” regression teaching materials [Example 1] known at t °C, the unsaturated solution of a substance a grams, if the evaporation of b grams of water and recovered to t °C precipitated solute M_1