北京市2019年中考化学真题试题
2019年北京市中考化学考试试卷本试卷分为第一部分(选择题)和第二部分(非选择题)两部分,共6页,满分45分,考试时长45分钟,考生务必将答案写在答题纸上,在试卷上作答无效。考试结束后,将本试卷和答题纸一并交回。可能用到的相对原子质量:H1C12O16第一部分选择题(共12分)每小题1分。在每小题列出的四个选项中,选出符合题目要求的一项。1.空气成分中,体积分数最大的是()A.氧气B.氮气C.稀有气体D.二氧化碳2.下列属于非金属元素的是()A.MgB.ZnC.CID.Ag3.一些食物的pH范围如下,其中呈碱性的是()A.柠檬汁(2.0~3.0)B.番茄汁(4.0~4.4)C.牛奶(6.3~6...
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