2021年北京市中考化学真题
2021年北京市初中学业水平考试化学试卷可能用到的相对原子质量:C-12O-16Zn-65第一部分本部分共25题,每题1分,共25分。在每题列出的四个选项中,选出最符合题目要求的一项。1.空气的成分中,体积分数约占78%的是A.氮气B.氧气C.二氧化碳D.稀有气体【答案】A2.下列物质在O2中燃烧,火星四射,生成黑色固体的是A.木炭B.镁条C.蜡烛D.铁丝【答案】D3.将CO2通入下列液体中,能产生白色沉淀的是A.水B.稀硫酸C.食盐水D.澄清石灰水【答案】D4.下列物质能用作氮肥的是A.KClB.K2CO3C.NH4ClD.Ca3(PO4)2【答案】C5.下列物质属于氧化物的是A.O2B.C...
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