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]...
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 ...
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....
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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...
The large amounts needed for industry are produced in a different way. Air is put into containers under great pressure. This turns it into liquid and makes it very cold. It is then gradually warmed up and each substance evaporates at a different temperature. The boiling point of oxygen is ...
Pure chemical compounds are substances composed of bonded molecules or ions. 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. ...
Water consists of hydrogen and oxygen inorganic compounds composed of two elements, at room temperature and pressure for the colorless, odorless liquid. Water is one of the most common substance on Earth, is important for the survival of all life, including human resources, is the most important...