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2018年中考化学真题分类汇编3化学实验与探究考点16常用的化学实验技能2除杂3提纯（无答案）.doc

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1常用的化学实验技能（18 安顺）6、下列分离或提纯物质的方法中，所依据的原理正确的是（ ）选项 混合物的分离或提纯 分离原理A 分离液态空气制取氧气 利用氮气和氧气的熔点不同B 将石油分馏得到石油产品 石油中各成分的密度不同C 分离硝酸钾和氯化钠组成的混合物 硝酸钾和氯化钠分解温度不同D 除去粗盐中的泥沙 氯化钠和泥沙的溶解性不同

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