2011年湖南省株洲市中考化学试卷(教师版) 学霸冲冲冲shop348121278.taobao.com
2011年湖南省株洲市中考化学试卷(教师版)一、选择题(本大题共20小题,每小题2分,共40分,在每小题给出的四个选项中,只有一项是符合题目要求的)1.(2分)空气是一种宝贵资源,人类每时每刻都离不开空气.空气成分按体积计,氧气约占( )A.78%B.21%C.50%D.1%【考点】61:空气的成分及各成分的体积分数.菁优网版权所有【分析】根据空气中各成分及体积分数来回答本题.【解答】解:空气中各成分及体积分数为:氮气:78%、氧气:21%、稀有气体:0.94%、二氧化碳0.03%、水蒸气和杂质:0.03%。故选:B。【点评】熟记空气中各成分及体积分数,知道空气中的主要气体,哪种气体最多,哪...
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