离子方程式的正误判断题,既考查学生使用化学用语的准确程度,又考查学生阅读理解、分析推理的综合能力.解答此类题,一般应从以下几方面考虑.1.看是否符合反应事实符合反应事实应以物质反应的实验事实为依据.例如,CaCl_2中通入CO_2:Ca~(2+)+CO_2+H_2O=CaCO_3↓+H~+(错,因弱酸不制强酸) The right and wrong judgment questions of the ion equation not only examine the accuracy of students’ use of chemical terms, but also examine students’ comprehensive comprehension of reading comprehension and analysis and reasoning. Answering such questions should generally be considered from the following aspects: 1. To see if the response meets the facts. The facts should be based on the experimental facts of the material reaction. For example, CaCl 2 is fed with CO 2 : Ca 2+ + CO 2+ H 2 O = CaCO _ 3 ↓ + H + + (wrong because weak acids do not produce strong acids)