Nitrogen is the most abundant gas in the atmosphere. Air is composed of 78 percent nitrogen. Oxygen accounts for 21 percent, and the inert noble gas argon makes up 0.9 percent of the air. The remaining 0.1 percent consists of several trace gases. Most of the 0.1 percent is carbon dioxide....
百度试题 结果1 题目(10)-What is the percentageof nitrogen(氮)in the air?About 78 percent . (percent) 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
百度试题 结果1 题目(10)-What is the percentage of nitrogen () in the air?-About 78percent . (percent) 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
Briefly explain the process of nitrogen fixation in the soil. What percent of U.S. electrical production comes from coal? a. 5% b. 25% c. 52% d. 95% What percentage of pregnancies last longer than 282 days? (a) Explain lactose intolerance. (b) What percentage of the world's populati...
2. In all of the four offshore sea areas, inorganic nitrogen and active phosphate were found. 3. Wang said they turn into carbon dioxide and nitrogen, elements that are ordinarily found in the air. 4. The concentration of carbon monoxide reduced by 15 percent from the same period last yea...
a chemical element that has seven protons in each nucleus and that occurs as a colorless, odorless gas that comprises about eighty percent of the earth's atmosphere, or in important compounds such as nitrates, proteins, nucleic acids, and ammonia. (symbol: N) ...
What is the percentage ofnitrogenin air? 空气中所含的氮的比例是多少? 《简明英汉词典》 Nitrogenis a gas without colour or smell. 氮是一种无色无臭的气体. 《简明英汉词典》 The plant requiresnitrogenin order to make proteins. 植物需要氮以便制造蛋白质. ...
nitrogen - a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues atomic number 7, N chemical element, element - any of the more than 100 known substances (of which...
[U]〈化〉氮a gas that is a simple substance, without color or smell, that forms most of the Earth's air 英英释义 nitrogen[ 'naitrədʒən ] n.a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by...
Almost 80 percent of the air we breathe consists of nitrogen. All living things need the gas to build proteins and other materials, but only a few organisms can actually convert nitrogen from the air into a form we can absorb. Now researchers from Michigan State University have found a new...