The exploration of Mars has attracted a lot of attention. What is the atmosphere of Mars mainly composed of? A. Oxygen and nitrogen B. Carbon dioxide C. Hydrogen and helium D. Methane 相关知识点: 试题来源: 解析 B。火星的大气层主要由二氧化碳组成。选项 A 氧气和氮气不是火星大气层主要成...
What is an organic acid and polymer composed of four nitrogenous bases (adenine, thymine, cytosine, and guanine) called? It is the genetic material of most organisms and exists as a double-stranded molecule held together by hydrogen bonds. Which...
Hydrogen is the smallest atom of all the known elements. A neutral hydrogen atom, meaning one that does not have a positive or a neutral charge, is composed of a single proton and a single electron. There are no neutrons in a typical hydrogen atom though some isotopes of hydrogen may incl...
a) What is the empirical formula for a compound that is composed of 93.71% C and 6.29% H? b) Calculate the molecular formula if the molecular weight of the compound is 192.27 g? The empirical formula of a compound is CH. If the molecular mas...
One theory says, we know these compounds are composed of carbon and hydrogen, right? That's why we consider them organic. But one idea is that they came originally from inorganic elements that amino acid can be, in fact, were created out of non organic components, that these non organic ...
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What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass?What is the empirical formula of a compound composed of 3.25% hydrogen, 19.36% carbon, and 77.39% oxygen by mass?
Although we do not know the precise composition of the early atmosphere, there has been enough progress made on this subject in recent years that it is possible to say with some certainty that the methane-rich composition envisioned by Oparin, and the methane-ammonia-hydrogen mixture used by Mi...
This polymer is composed of alternating benzene ring and amide groups, leading to a rigid, rod-like structure. Characteristics of aramid fibers Aramids fibers show resistance to many solvents and salt, but can be weakened by strong acids. While they are difficult to dye and sensitive to UV ...
Water is composed of an oxygen atom bound to two hydrogen atoms. Oxygen is a very electronegative atom, meaning it easily attracts electrons. So, in... Learn more about this topic: Water Molecule | Definition, Facts & Structure from