It is a mixture of different gases可知正确答案.故答案为C.(4).【答案】A【解析】由原文第三段的If 1000 dots can represent the air, then 776 of them are nitrogen, 210 are oxygen, 11 are argon可知正确答案.故答案为A. 结果一 题目 2.阅读理解。What is air? Air is not just one gas....
Identify the components of the atmosphere and understand the significance of the composition of gases in Earth's air. Related to this QuestionWhat is the percentage of oxygen contained in air? What is the density of oxygen? What percent of the air we breathe is oxygen? What is the partial ...
We often say, “Air is in the atmosphere(大气).” In fact, the atmosphere consists of air, and the atmosphere surrounds the earth. Air is a mixture of gases. The atmosphere consists mostly of nitrogen(氮气) and oxygen. It also contains water vapor, carbon dioxide and other gases. Water...
Clearing the air: oxygen is one of the most important--and least understood--lifesaving tools. Here's what you need to know.(risk management)Davis, TomAquatics International
Air contains 20.95% oxygen. What is the concentration of oxygen in the atmosphere (0 degrees Celsius and 1 atm) using units of g/L? Mole Fraction: One of the useful concentration units that we can use to express solutes' concentration is t...
【题目】It is a gas.What is it? It is invisible-we cannot see it.20% of the air is oxyge Where is it fn.OSYGE ound? Oxygen is also foun d i Nn water.We nee d to breathe the Why is it im oxygen.portant? People an d animals nee d it to live.(1) This is a___. A....
What is the path of air as it enters your nose? Air: Air is very important for all living organisms because it contains a specific molecule called oxygen. Oxygen is important for cells because during cellular respiration, glucose and oxygen are made into usable energy for the cell and the ...
What is the chemical ___ for oxygen? A. symbol B. stage C. step 相关知识点: 试题来源: 解析 【解析】【答案】A 【核心短语/词汇】symbol:符号 【翻译】氧气的化学物质符号是什么吗? 【解析】A.符号 B.阶段 C.步骤。根据句意”氧 气的化学 是什么吗”及选项可知,此处应填 入“符号”,故答案...
Step-by-Step Solution:1. Determine the Percentage of Oxygen in Air: - The composition of air is made up of various gases. The most significant component is nitrogen, which makes up about 78% of the atmospher
Oxygen is not dangerous. By anon229958 — On Nov 16, 2011 Oxygen concentrators are quite amazing. They help so many people with respiratory problems by concentrating air with oxygen and delivering it to them. The best part of that is that now those who couldn't go out and do things bec...