9 What is the number of oxygen atoms, in terms of the Avogadro number $$ N _ { A } $$, in one mole of carbon dioxide ($$ ( C O _ { 2 } $$)?A$$ \frac { 1 } { 3 } N _ { A } $$B$$ \frac { 2 } { 3 } N _ { A } $$C$$ N _ { A } $$D$$ 2 N...
It would seem that an introduction to oxygen is unnecessary, for we deal with it and depend upon it every moment of our lives. Oxygen is to us the essential stuff of the air we breathe. We are aerobic animals who obtain energy by oxidizing foodstuffs. As such, we are wholly dependent ...
What is the electronegativity of oxygen? Oxygen: Oxygen is a gas at standard temperature and pressure. It is an oxidizing agent, and it is atomic number 8. Oxygen is essential for aerobic organisms, which need oxygen to survive. In molecules, oxygen is found in all organisms, most commonly...
How many electrons can be held in the first orbital? What is the maximum number of electrons in the n = 2 energy level? In most elements, the valence shell holds a maximum of how many electrons? What is the maximum number of electrons in the second principal energy level? How...
Values under 90 percent are considered low, and indicate the need for supplemental oxygen. This condition is often referred to as hypoxemia, and its symptoms include severe shortness of breath, increased heart rate and chest pain. For people with chronic lung conditions and other breathing ...
A. what B. which C. that D.it 相关知识点: 试题来源: 解析 3.C 【解析】考查定语从句的关系词。 句意:氧气是能助 燃的唯一气体吗?先行词为gas,指物,该空在从句中作 主语,不可省略,且先行词前有 the only 修饰,引导词只 能用 that 而不能用 which。 故选 C。 反馈 收藏 ...
One of the most common GHGs, CO2, is found in the Earth’s atmosphere and, along with nitrogen, oxygen,methane, and other gases, is part of the planet’s air.CO2helps trap heaton Earth, like a greenhouse traps heat to grow tomatoes in cold climates. But too much of it can cause pro...
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...
A single electron in an ion has ionization energy equal to217.6eV. What is the total number of neutrons present in one ion of it? View Solution Calculate the total number of electrons present in3.2gof oxygen gas. View Solution What is the total number of atoms present in 25.0 mg of camp...
What is the maximum number of electrons that can be present in a shell represented by shell number ‘n’? A2n B2n2 Cn Dn2Submit What is the maximum number of electrons that can go into the N shell of an atom ? View Solution What is the maximum number of electrons which can be accom...