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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15化学实验常用仪器和基本操作3综合实验蜡烛的燃烧（无答案）.doc

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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15化学实验常用仪器和基本操作3综合实验蜡烛的燃烧（无答案）.doc_第1页
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1化学实验常用仪器和基本操作（18 安徽）10实验室测定蜡烛在盛有一定体积空气的密闭容器内燃烧至熄灭过程中，O 2和 CO 含量随时间变化曲线如右图，通过分析该图可推理出的结论是A曲线表示 CO 含量的变化B蜡烛发生了不完全燃烧 C蜡烛由碳、氢元素组成D蜡烛熄灭时，容器内氧气耗尽 （18 北京）19、用下图装置进行实验（夹持仪器略去） 。加热一段时间后，蜡烛熔化、掉落，之后火柴燃烧。（1）能说明铜具有导热性的现象是 。（2）能体现物质化学性质的现象是 （填序号） 。A.酒精燃烧 B.蜡烛熔化 C.火柴燃烧

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