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包头专版2018年中考化学复习练习第五章燃料5.1洁净的燃料_氢气201901141139.doc

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15.1 洁净的燃料氢气1点燃氢气必须验纯的原因是( )A氢气的着火点很低B氢气燃烧时会产生大量的热C氢气与空气相混后，若其含量在爆炸极限范围内，则点燃会发生爆炸D氢气点燃后产生的水蒸气体积比氢气大2在通常状况下，不能用于鉴别氢气和氧气的方法是( )A. 分别用带火星木条伸入气体 B分别将燃着的木条接触气体C分别吹肥皂泡 D分别观察颜色、状态、气味2参考答案1C 2.D

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