A. hydrogen peroxide B. hydrogen oxide C. water D. carbon dioxide 相关知识点: 试题来源: 解析 C。在化学中,符号“H₂O”代表水(water)。A 选项 hydrogen peroxide 是过氧化氢;B 选项 hydrogen oxide 表述不准确;D 选项 carbon dioxide 是二氧化碳。
481 -- 6:02 App A Level化学Topic 9 state symbol and balancing ionic equation 717 -- 11:04 App A Level化学Topic 8 Naming compounds 488 1 9:25 App A Level化学Topic 19 Subshells 492 -- 7:51 App A Level化学Topic 20 Atomic orbitals 1240 2 50:53 App A Level化学Topic 31-36 ...
A compound is identified by its name and chemical formula. The formula reflects the compound's elemental makeup. It includes thechemical symbolfor each element in the compound, and the number of atoms for that element if there's more than one. For instance, the chemical formula for sulfuric ...
百度试题 结果1 题目The symbol for hydrogen in chemistry is ___. A. H B. He C. O D. N 相关知识点: 试题来源: 解析 A。在化学中,氢的符号是 H。B 选项 He 是氦;C 选项 O 是氧;D 选项 N 是氮。所以选 A。
A. pushes for B. stands for C. searches for D. cares for 相关知识点: 试题来源: 解析 B 【详解】 句意:化学老师让露西告诉她哪个符号代表氧。 考查动词短语。pushes for推动;stands for代表;searches for寻找;cares for照顾。根据“which symbol... oxygen.”可知,是指哪个符号代表氧。故选B。
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一,教材分析人教版(Go for it)英语八年级下册教材根据学生心理特点,认知水平和学习兴趣进行编写,全书共有十个单元,各单元话题灵活,贴近生活实际,单元与单元之间环环相扣,互相渗透,便于学生接受新知识,同时对旧知识进行循环巩固.本册书中语法知识点有情态动词,反身代词,不定式,连词,过去进行时,现在完成时,形容词和副...
The role of symbols in the development of chemistry to 1916 : with, A dictionary of chemical terms (1600-1800) 来自 minerva-access.unimelb.edu.au 喜欢 0 阅读量: 25 作者: F Bryant 摘要: The Oxford English Dictionary offers a number of meanings for the word symbol; "Something that stands...
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atomic symbol 原子符号atomic theory 原子论atomic unit 原子单位atomic volume 原子体积atomic weight 原子量atomicity 原子数atomism 原子论atomistics 原子论atomization 喷雾atomizer 喷雾器atophan 阿托方atrazine 阿特拉津atropic acid 阿托酸atropine 阿托品atropine sulfate 硫酸阿托品atropisomer 阿托异构体attachment 附件...