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2018年中考化学真题分类汇编4化学与社会发展考点19化学及其应用2研究化学的方法4数轴（无答案）.doc

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1考点 19 化学及其应用（18 连云港）31.下列排序正确的是A.空气中物质的含量： B.溶液的 pH：C.氮元素的化合价： D.硫元素的质量分数：（18 深圳）3.归纳总结是学习化学的重要方法之一。下列排序正确的是（ ）A.金属活动性顺序： B.溶液的 pH: C.地壳中的元素含量： 2D.气体的密度：

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