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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5物质的变化与性质4化学反应1反应前后的变化情况（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5物质的变化与性质4化学反应1反应前后的变化情况（无答案）.doc_第1页
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1化学反应（18 威海）6在化学变化中，下列说法正确的是原子的种类、元素的种粪、分子的种类均不变原子的数目、分子的数目均不变 原子的质量、元素的质量、物质的总质量均不变原子核的种类、数量、质量均不变A B. C D.

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