吉林省长春市2018年中考化学真题试题(含解析)
吉林省长春市2018年中考化学真题试题一、选择题(共10分)考生注意:每小题只有一个选项符合题意;请用2B铅笔将答题卡上的相应序号涂黑.1.(1分)(2018•长春)空气成分中,体积分数最大的气体是( )A.氮气B.氧气C.稀有气体D.二氧化碳【考点】61:空气的成分及各成分的体积分数.【专题】521:空气与水.【分析】空气中各成分的体积分数分别是:氮气大约占78%、氧气大约占21%、稀有气体大约占0.94%、二氧化碳大约占0.03%、水蒸气和其它气体和杂质大约占0.03%;【解答】解:A、氮气大约占空气体积的78%,体积分数最大,故A正确;B、氧气大约占空气体积的21%,不是最大,故B错;...
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