We all realize that oxygen is a dangerous friend. Oxygen is something that we cannot live without, but it is also a substance that we cannot live with indefinately. This chapter will review two aspects of this subject. First, an overview will be given of some of the points relevant to ...
However, if Earth were a little closer to the Sun, its oceans would evaporate; if it were farther from the Sun, the oceans would freeze solid. [#highlight12]Because liquid water was present, self-replicating molecules of carbon, hydrogen, and oxygen developed life early in Earth’s history...
Water is a substance essential to our life, and comes next to oxygen in importance. A importantB seriousC basicD potential 相关知识点: 试题来源: 解析 A important 题目要求选择与“essential”意思最接近的选项。 “essential”意为“必不可少的,极其重要的”。 选项中,“important”意为“重要的”,与...
aA compound is a substance that can be split into two or more elements. Water is a compound because it can be split into its components, hydrogen and oxygen. 化合物是可以被分裂成两个或多个元素的物质。 因为它可以被分裂成它的组分、氢和氧气,水是化合物。[translate]...
百度试题 结果1 题目6. Oxygen is one of the basic elements(元素) of substance. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
What are the properties of a solid? What is the difference between an atom of oxygen and a molecule of oxygen? Which are some of the physical properties of a compound or substance? What are physical properties? Describe the properties of water. ...
For example, pure water is s chemical substance since it always has the same ratio of hydrogen to oxygen. However, seawater is a mixture since it contains sand, salt, and other complex molecules. Chemical Mixtures A mixture is made of two or more chemical substances that are physically ...
水是我们生活中必不可少的一种物质,其重要性仅次于氧。(substance, next to) Water is a substance essential to our life, and comes next only to oxygen in importance.相关知识点: 试题来源: 解析 答案:Water is a substance essential to our life, and comes next only to oxygen in importance....
Oxygen is a kind of simple substance formed by oxygen element, chemical formula O2, its chemical properties are more active, and can react with oxygen with most elements. It is not very active at room temperature, and it is not easy to interact with many substances. However, it is very ...
What is the substance that prevents alveoli from closing? Which of the following would result from hyperventilation? a. respiratory acidosis b. respiratory alkalosis c. metabolic alkalosis d. metabolic acidosis Under which condition is oxygen most likely to bind to hemoglobin in the lungs? A. highe...