The atomic number of oxygen is eight, and it is identified by an O symbol on the periodic table of elements. In addition to being very widely distributed on Earth, it is also the third most abundant element in the universe, and it is a key catalyst in many chemical reactions. Oxidation...
A. Silicon atoms. B. Carbon atoms. C. Oxygen atoms. D. Hydrogen atoms. 相关知识点: 试题来源: 解析 B。解析:文章中明确提到“Graphene is an extremely thin and strong material. It is made up of a single layer of carbon atoms arranged in a hexagonal lattice.”,石墨烯是由一层碳原子组成...
In photosynthesis, what is the source of oxygen? A. water B. carbon dioxide C. sunlight D. chlorophyll 相关知识点: 试题来源: 解析 A。在光合作用中,氧气的来源是水(water)。二氧化碳(carbon dioxide)是光合作用的原料之一,但不是氧气的来源。太阳光(sunlight)是光合作用的能量来源。叶绿素(chlorophyll)...
An oxygen deficit is a type of condition in which there is a shortage of oxygen in an organism. The causes of oxygen deficit...
The human body contains around 20 different elements, mostly made inside ancient stars. If you deconstructed an 80kg human into atoms, you would get about the following amounts of the different elements: Oxygen – 52kg This element makes up more than half the mass of your body but only a...
What is an oxygen deficit? Oxygen: For an aerobic organism, oxygen is an obligatory requirement. Depending upon aerobic organisms, a basal level of oxygen in the body must be always maintained. Answer and Explanation: 1 Become a Study.com member to unlock this answer! Create your account ...
Animal metabolism depends upon oxygen for almost all of its energy-generating processes. Yet this was not always so. Early in the history of the Earth, there was essentially no free oxygen anywhere, although oxygen has always been one of the most abundant elements on Earth. In the early ...
Oxygen injection is a technique that is used to promote the growth of beneficial aerobic bacteria in sludges and liquids. When...
The chemical element with atomic number 8 is oxygen. What is the abbreviation for oxygen? A. Oy B. O C. Od D. Og 相关知识点: 试题来源: 解析 B。氧元素的英文是 oxygen,其缩写形式是 O。选项 A“Oy”不是氧元素的正确缩写;选项 C“Od”一般不是任何化学元素的缩写;选项 D“Og”一般不是...
elements. The truth is more complex. For one thing, the four elements attributed to Empedocles and enshrined in Aristotle’s philosophy were by no means the only scheme for the basic building blocks of matter in Greek thought. And before the golden age of chemistry during the late ...