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对往年国家考试中心命制的高考化学试题中的实验大题进行统计,不难看出有关气体制备及性质的内容考查最多,且有些题型会有隔几年再现的情况.将此类试题归纳出常考知识要点,找出规律,再让一些经典试题重现,迁移应用,或许能让“依旧笑春风的桃花”可映红新的“面颊”.一、考查知识要点1.气体流经装置的进出方式洗气、验证气体的存在及干燥装置:液体试剂装在洗气瓶中,“长进短出”(进气管应插入液体中,出
In the past years, the national examination center for the test of the chemical composition of the college entrance examination in the big test statistics, it is easy to see the contents of the gas preparation and nature of the most exam, and some questions will be reproduced every few years. Out of regular knowledge of key points to find out the law, let some classic questions to reproduce, migrate applications, may allow “peach ” is still smiling spring “can reflect the red ” cheek “. Gas flows in and out of the unit Scrubs, verifies the presence of gas and the drying unit: Liquid reagent in the scrubber bottle, ”Advance to short" (Intake pipe should be inserted into the liquid, out