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Pages: 45-48
Year: Issue:  6
Journal: Teaching and Learning Reference for Middle School Chemistry

Keyword:  高锰酸钾硫酸铜晶体饱和溶液固体化合物二氧化碳物质溶解度碳元素氧化铁;
Abstract: <正> 一、选择题 1.下列变化属于物理变化的是 A.钢铁生锈 B.蜡烛燃烧 C.冰融化成水 D.白磷自燃 2.下列物质属于纯净物的一组是 A.水煤气、干冰 B.高锰酸钾分解后的固体产物、液氧 C.含铁70%的氧化铁、硫酸铜晶体 D.食盐水、硫粉 3.乙炔(C2H2)中含有
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