百度试题 结果1 题目Which one is not an element? A. Hydrogen B. Oxygen C. Water D. Iron 相关知识点: 试题来源: 解析 C。本题考查物质分类。Hydrogen(氢)、Oxygen(氧)、Iron(铁)都是元素,而 Water(水)是化合物,不是元素。反馈 收藏
In chemistry, which of the following is an "element"? A. Water B. Air C. Oxygen D. Soil 相关知识点: 试题来源: 解析 C。解析:“element”是元素的意思。氧气(Oxygen)是一种元素。水(Water)是由氢和氧两种元素组成的化合物;空气(Air)是混合物;土壤(Soil)也是混合物。反馈 收藏 ...
Select the correct answer. Which of the following elements makes up the majority of Earth's atmosphere? a. Oxygen b. Hydrogen c. Argon d. Nitrogen Elements in the atmosphere Although the Earth's atmosphere contains a lot of nitrogen...
The electronic configuration of an element X is: 1s 2s 2p6 3s2 3p5 Deduce the atomic number of X To what group does it belong? Give two properties of the group to which the element X belong. Identify element X by name. Write a balanced...
Which element is the most electronegative? View Solution The element with highest electronegativity is View Solution Which of the following elements has maximum electronegativity? View Solution Which of the following elements has maximum electronegativity?
百度试题 结果1 题目30 Which element in Group VI is a component of air? C A argon B nitrogen C oxygen D sulfur 相关知识点: 试题来源: 解析 C 反馈 收藏
Answer these questions in your class-work jotter You have until 8:50 to complete them! 1.What is the process of BREAKING DOWN a carbohydrate? 2.Proteins break down into which type of monomers? 3.What is the essential element in Proteins 4.What part of the structure gives oils a lower ...
The set of elements (or their relative proportions) used by life based on some other element might be somewhat different from that used by carbon-based life on Earth. But the elements are still products of stars and would still be present in planetesimals everywhere. No matter what kinds of...
PROBLEM TO BE SOLVED: To provide an oxygen separating membrane element with a joint part which can ensure sufficient sealing properties in a high use temperature range as a joint part (sealing part) of the oxygen separating membrane element having an oxygen separating membrane composed of a ...
aThe glucose oxidase enzyme is used as a biorecognition element: glucose oxidase oxidizes glucose to gluconic acid and shuffles electrons into the oxygen which is dissolved in the solution, and then reduced to hydrogen 葡糖氧化酶酵素使用作为biorecognition元素: 葡糖氧化酶氧化葡萄糖对葡糖酸并且拖曳...