2012年西藏自治区中考化学真题
2012年西藏自治区中考化学试卷(区内)一、单项选择题(本题共15小题,每小题2分,共30分)1. 空气中含量最多的气体是( )A.氧气B.氮气C.二氧化碳D.氦气2. 我们身边的物质中,属于纯净物的是( )A.空气B.蒸馏水C.加碘食盐D.矿泉水3. 下列物质的性质中,属于化学性质的是( )A.金刚石很坚硬B.氢气密度很小C.冰易熔化D.铁易生锈4. 下列实验操作正确的是( )A.往试管里加锌粒B.量取液体C.加热液体D.检查装置气密性5. 为了预防贫血,应该补充的元素是( )A.铁B.钙C.碘D.钾6. 将100mL水与100mL酒精混合,所得溶液的体积小于200mL,对此现象的...
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