精品解析:2023年上海市中考化学真题(解析版)
2023年上海市中考化学真题相对原子质量:H—1C—12O—16Mg—24S—32K—39Ba—137一、选择题(本大题共17题,共20分)1~14每题只有1个正确选项,每题1分,共14分。1.月壤中含硅元素,硅的元素符号是A.HgB.HeC.SiD.S【答案】C【解析】【分析】书写元素符号时要注意只有一个字母表示的要大写,两个字母表示的第一个字母大写,第二个字母小写,硅元素符号为Si。【详解】A、Hg表示汞元素,故不符合题意;B、He表示氦元素,故不符合题意;C、Si表示硅元素,故符合题意;D、S表示硫元素,故不符合题意,故选C。2.冰箱中放入活性炭,目的是A.制冷B.除异味C.加湿D.节能...
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