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初中化学中常出现含杂质的推断题,解这类题目,学生往往抓不住要点,耗时过多,计算繁乱,且容易出错。现就一些具体的问题进行分析。例1某含杂质的硝酸铵样品,经过测定其含氮量为36%,则杂质可能是( )
In junior high school chemistry, there are often deduced questions that contain impurities. To solve such questions, students often fail to grasp the main points, consume too much time, are computationally messy, and are prone to errors. Now analyze some specific issues. Example 1 The ammonium nitrate sample containing impurities was determined to have a nitrogen content of 36%. The impurity may be ()