Hydrogen makes up two of the three atoms in water and water is absolutely essential to life. Hydrogen is present in all organic compounds. A form of water in which both hydrogen atoms are replaced by deuterium (2H, or D) is called "heavy water" (D2O) and is toxic to mammals. Some ba...
[03:52.84]Asteroids are rocky space bodies [03:56.00]that formed in the early period of the solar system. [04:00.20]The researchers suggest [04:02.72]that the organic compounds found on Ryugu [04:06.68]may have been fo...
the neutron, and theelectron. Although the proton and the neutron are themselves composed of smaller units, their substructure has little impact on chemical transformation. As was explained in an earlier section, the proton carries a charge of +1, and the number of protons ...
Qualitative and quantitative analyses of nutritional supplements and adulteration/toxic elements present in various tea leaves have been performed and compared. Rapid identification of inorganic (i.e., Ca, K, Na, Mg, Ba, Al, Sr, Mn) and organic (C, N, O, H) elements have been done using...
If some elements are present in a same group, then it is assumed that they will show similar chemical properties. This is based upon the fact that...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can ...
Elements such as copper (Cu), manganese (Mn), selenium (Se) and zinc (Zn) also called micronutrients are essential for living organism and play important roles in the functioning of the critical enzyme system3. They are present in trace quantities; however, high intake of these elements ...
The literature data present research on separate elements of the functional state of muscle tissue at each stage of development of this fish species. Different effects of environmental and internal development factors are taken into account. However, there is no complete picture of interrelations and ...
What are the main threats to health in the modern society?() A、Smoking, drinking alcohol and an unbalanced diet B、Air pollution and traffic accidents C、Human’s emotional instability D、All of the above 点击查看答案 第3题 Vitamins are organic compounds necessary in small amounts in the ...
Amorphous porous organic polymers (aPOPs) are a type of highly crosslinked polymers. These polymers are generally constructed from rigid organic building blocks, which have become an important subclass of POPs with diverse applications. In the early stag
atoms are oxygen (44.6% by weight). Sweden, prepared oxygen at various times The “discovery” of oxygen is generally between 1771-3 by heating KNO3, Mg(N03)2, credited to C. W. Scheele and J. Priestley Ag2C03, HgO and a mixture of H ~ A s Oand~ (independently) in 1773-4, ...