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探究金属活动性顺序既是初中化学的重点与难点,也是中考命题的热点。命题时主要是以金属的活动性顺序为依托,考查实验现象的描述,化学式及化学方程式的书写以及实验结论的概括、归纳、推理等基本技能。解答此类题目应具备将已知金属活动性顺序的结论性知识,逆向应用于题目解答中去的意识。下面举例说明这类探究题的考点及解题方法,希望对同学们有所帮助。例(2013·湖南娄底)小聪同学家新换了水龙头,从说明书上了解到该水龙头是铜质镀铬。好奇的小聪想
To explore the sequence of metal activity is not only the focus and difficulty of junior high school chemistry, but also the hot topic in the test. The proposition is mainly based on the activity sequence of metals, examining the description of experimental phenomena, the writing of chemical and chemical equations, and the generalization, induction and reasoning of experimental conclusions. Answers to such questions should have the awareness of applying the conclusive knowledge of the known sequence of metal activities back to the topic answers. Here’s an example of such test questions test and problem solving methods, I hope to help students. Example (2013 Loudi, Hunan) Xiao Cong students replaced the tap, from the manual to understand that the tap is a copper chrome. Curious little think