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2018年中考化学真题分类汇编1物质的构成和变化考点6化学用语3化学式的组成和构成2选择题4饼状图（无答案）.doc

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2018年中考化学真题分类汇编1物质的构成和变化考点6化学用语3化学式的组成和构成2选择题4饼状图（无答案）.doc_第1页
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1化学用语（18 温州）6.茶叶中含有茶氨酸(C7H14O3N2)，茶氨酸中各元素质量分数如图所示。其中表示的元素是A.碳 B.氢 C.氧 D.氮（18 潍坊）9某矿石样本只含有如图所示的四种元素，该矿石中可能含有的物质是（ ）ACaCO 3BSiO 2 CAl 2O3 DCuFeS 2

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