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有关气体混合物的推断题,通常是通过一系列实验来定性或定量地判断混合气体的组成成分,既能考查学生对常见气体性质的掌握情况,又能考查学生的实验、观察、分析、推理、计算能力及思维的严密性,此类题综合性强、能力要求高,是新课程下高考试题的热点.下面举例谈谈此类题的解法.一、定性推断主要考查气体的性质,对常见气体特殊的物理性质和特征的化学性质必须熟练掌握.例如,有色气体:Cl_2为黄绿色,Br_2蒸气、NO_2均为红棕色.
Gas mixture inference questions, usually through a series of experiments to qualitatively or quantitatively determine the composition of gas mixtures, both to examine students to grasp the nature of common gases, but also examine the students experiment, observation, analysis, reasoning, Calculation ability and thinking rigor, such questions comprehensive, high ability requirements, is a hot topic in the college entrance examination under the new curriculum.Examples to talk about the solution of such questions.A qualitative inference of the nature of the main test gas, common For example, colored gas: Cl_2 is yellow-green, Br_2 vapor, and NO_2 are red-brown.