百度试题 结果1 题目() 5. What is the chemical for oxygen? A. symbol B. stage C. step 相关知识点: 试题来源: 解析 A 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...
()3. Dirty air is more noticeable___ the fumes and the waste. A. becauseB. forC. asD. because of ()4. —Why do you plant so many trees around your house? —Because trees can___ CO2. A. turn intoB. burn upC. give outD. take in ()5. —I think C...
Oxygen is a gaseous chemical element vital to respiration. Although pure oxygen is used medicinally, it can be dangerous when...
Oxygen Properties, Formulas & Uses from Chapter 28 / Lesson 27 38K Learn about oxygen and the forms it takes. Discover the properties of elemental oxygen, the O2 compound name, and the O3 compound, as well as their uses. Related to this QuestionWhat...
C. Oxygen gas, water, and sodium bicarbonate. D. Hydrogen gas, water, and sodium acetate. 相关知识点: 试题来源: 解析 B。中文解析:文中提到“The reaction produces carbon dioxide gas, water, and sodium acetate.”A 选项中的氧气不是该反应产物;C 选项中的氧气不是该反应产物;D 选项中的氢气不...
百度试题 题目What is the atomic number of oxygen?A、2B、6C、8D、20Answer:C 科目四考试网___科目四考试题库相关知识点: 试题来源: 解析 http://www.km4ks.com/st/tk/ 反馈 收藏
Step-by-Step Text Solution:1. Understanding Pure Substances: - Pure substances are materials that have a uniform and definite composition. They consist of only one type of particle.2. Classifi
Haemoglobin (Hb) is the protein that transports oxygen in mammals.Hb is 0.342% Fe by mass and each Hb molecule contains four iron atoms.Calculate the molar mass of Hb. The specific heat capacity of silver is 0.24 J/°C·g. A mass of 0.1156g of a substance that is composed of carbon...
Kensal E. van HoldeSpringer Berlin HeidelbergDecker, H. & Van Holde, K., E. 2011, "Oxygen, Its Nature And Chemistry: What Is So Special About This Element?" in Oxygen and the evolution of life, Springer, Berlin; Heidelberg; New York, pp. 1-18....