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俄国心理学家谢切诺夫说:“比较是人类最珍贵的宝藏。”对比是科学研究中的常用方法,用来辨别异同、区分物质的特性和共性。酸碱盐是初中化学的研究重点,包含的物质组成、性质及变化规律知识点较多,笔者就来谈谈酸碱盐的实验中如何运用对比法解决问题。一、对比化学性质,寻找突破口例1(2014.北京)碳酸钠和碳酸氢钠是生活
Schechenoff, a Russian psychologist, said: “Comparison is the most precious treasure of human beings.” Contrast is a common method used in scientific research to distinguish between similarities and differences and to distinguish the characteristics and commonalities of matter. Acid-base salt is the focus of junior high school chemistry, contains more knowledge of the composition, nature and variation of the law, the author will talk about how to use the contrast method to solve the problem in acid-base salt experiment. First, compare the chemical properties, to find a breakthrough Example 1 (2014. Beijing) Sodium carbonate and sodium bicarbonate is life