精品解析:2023年海南省中考化学真题(解析版)
机密★启用前海南省2023年初中学业水平考试化学(考试时间:60分钟,满分:100分)可能用到的相对原子质量:H-1 C-12 O-16 Mg-24 C1-35.5一、选择题(每小题只有一个选项符合题意,每小题3分,共42分)1.干燥空气中体积分数约占78%且化学性质不活泼的气体是A.氧气B.氮气C.二氧化碳D.水蒸气【答案】B【解析】【详解】A、氧气大约占21%,化学性质比较活泼,故A错误;B、氮气大约占78%,但是化学性质不活泼,故B正确;C、二氧化碳大约占0.03%含量较少,故C错误;D、水蒸气大约占0.03%含量较少,故D错误。故选B。2.下列是海南非物质文化遗产名录中的技艺,其中涉及...
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