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离子反应是高中化学中的重要反应类型,在工农业生产与社会发展中发挥着重要作用,因此成为高考考查的重要内容,考查内容包括离子方程式的书写和正误判断、离子共存、离子检验和推断等,是高考的重点、难点和热点。近几年来,离子共存的判断和推断题已成为必考题型之一,绝大多数以选择题出现,也有在综合题中出现,此类试题学生丢分也比较严重。怎样有效地解决“离子共存”类试题,提高正确率,下面结合典型例题说明复习策略和解题需要的关注点。
Ion reaction is an important type of reaction in senior high school chemistry. It plays an important role in industrial and agricultural production and social development. Therefore, it has become an important part of the college entrance examination examination. The contents of the examination include the writing of ion equations, the correctness and misjudgment, ion coexistence, ion detection, and inference. Etc., is the focus, difficulty and hot spot of the college entrance examination. In recent years, the coexistence of ion determination and inference questions have become one of the exam questions. Most of them appear as multiple-choice questions, and they also appear in comprehensive questions. The loss of such questions is also serious. How to effectively solve the “Ionic coexistence” test questions to improve the correct rate, the following examples illustrate the need for review strategies and problem solving.