2s 2 2p 3 cas number 7727-37-9 chemspider id 20473555 chemspider is a free chemical structure database what is nitrogen? the seventh element of the periodic table between carbon and oxygen is nitrogen. it’s an important part of amino acids. around eighty per cent of the earth’s ...
百度试题 结果1 题目What is the chemical symbol for oxygen? A. O2 B. O3 C. O D. OH 相关知识点: 试题来源: 解析 C. O 反馈 收藏
解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
What is the formula for 1 lithium atom, 1 nitrogen atom and 3 oxygen atoms If the formula of an oxide of element X is XO, what is the formula of the nitride of X? What is the formula for phosphorus acid? What is the chemical formula of a compound that contains Mg and Cl?
百度试题 结果1 题目Is oxygen the only gas ___ helps fire burn A. which ﻩ B. what ﻩ C. that D. it 相关知识点: 试题来源: 解析 C 反馈 收藏
Magnesium burns in oxygen to form magnesium oxide. What is the balanced equation? A. Mg + O₂ = MgO B. 2Mg + O₂ = 2MgO C. Mg + 2O₂ = MgO₂ D. 2Mg + 2O₂ = 4MgO 相关知识点: 试题来源: 解析 B。解析:镁在氧气中燃烧生成氧化镁,根据化学反应前后原子种类和数目不变,...
The chemical formula for hydroxide is OH-. The "O" stands for an oxygen atom, which is bound to the "H" a hydrogen atom. The... See full answer below.Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer ...
A.that B./ C.what D.it相关知识点: 试题来源: 解析 A 考查定语从句。Gas为先行词,在定从___ helps fire burn中作主语,且that作主语时不可省略。所以选A。 分析总结。 gas为先行词在定从helpsfireburn中作主语且that作主语时不可省略反馈 收藏 ...
1. Chemical Formula of Ferric oxide Ferric oxide is a compound composed of iron and oxygen. There are three common chemical formulas for Ferric oxide: FeO, Fe2O3, and Fe3O4. - FeO: Ferrous oxide, composed of one iron ion and one oxygen ion. It is a dark gray solid that is stable...
Mark knowledge Chinese name: Cesium hydroxide English name: cesium hydroxide monohydrate Hazard category: Category 8.2 Alkaline corrosives Molecular ..