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...
The hydrogen atoms in your body were formed in the Big Bang. All the others were made inside a star long ago and were flung into space by a supernova explosion. So though you may have heard that we are all stardust, that isn’t strictly true. Nitrogen – 2.4kg The four most abundan...
The hydrogen molecule, consisting of two hydrogen atoms, can be used to produce carbon-free energy. Hydrogen molecules carry a lot of energy; a pound of hydrogen contains almost three times the energy of a pound of gasoline or diesel. However, hydrogen molecules are not abundant on Earth, ma...
What is the average mass of a single silicon atom in grams? What is the definition of atomic size in chemistry? An atom has 20 electrons and 20 neutrons. What is the mass of this atom? What is an atom? How many hydrogen atoms would have the same mass as one calci...
How is Hydrogen Energy Produced? Hydrogen can be produced using fossil fuels, conventional sources, or some sort of renewable energy source. The most widely adopted technique is steam reforming, where hydrogen atoms are separated from methane. Electrolysis or water splitting is another technique extens...
What is hydrogenation? Hydrogenation is a chemical reaction between molecular hydrogen and an element or compound, ordinarily in the presence of a catalyst. The reaction may be one in which hydrogen simply adds to a double or triple bond connecting two atoms in the structure of the molecule or...
The basic structure of silicone is made up of polyorganosiloxanes, where silicon atoms are linked to oxygen to create the «siloxane» bond.
Definition of an atom:Atoms are the smallest particles of an element that have the chemical properties of that element. Atoms are therefore extremely small (the hydrogen atom is the smallest) and are sometimes described as the "basic building blocks of matter". This description makes more ...
A hydrogen bond is a type of intermolecular bond in which a molecule containing hydrogen is attracted to another molecule other due to slight charge differences. Molecules become charged when some atoms are more electronegative than others and pull the shared electrons closer to them, creating ...
从一炉子的小孔射出的热辐射的总辐射本领为，以黑体辐射估算，炉子内部的温度为___K