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的。反馈 收藏 ...
Ceramides are made up of a substance called sphingosine. Sphingosine is a chain of carbon atoms with anamino acidattached to it. It has different forms that bind to other fatty acids to form ceramides. Based on the form of sphingosine and the fatty acid that binds it, there are 12 types ...
Here are a few examples: Color Changes Have you ever seen a flower change color or noticed how food changes when cooked? These are all examples of chemical reactions that occur due to changes in the arrangement of atoms and molecules. Pharmaceuticals Chemistry plays a crucial role in the ...
The backbone structure of silicone oils is made up of a chain of alternating silicon and oxygen atoms. Each silicon atom is bonded to two carbon-based substitution groups, almost invariably methyl groups. Within the silicone oils themselves, the chains glide and slip over one another, so the ...
and consists of one carbon atom and four hydrogen atoms that are all covalently bonded to one another. Each hydrogen atom shares one electron with the carbon atom. Methane (CH4), water (H2O), carbon chloride (CCl4), ammonia (NH3) and countless other covalent compounds are considered both mol...
It is the transfer of four atoms – one carbon atom and three hydrogen atoms (CH3) – from one substance to another. The addition of methyl groups can affect how some molecules act in the body. What is methylation in the body? When optimal methylation occurs, it has a significant ...
Are there metals far scarcer than iridium and enormously more expensive than gold — while at the same time, non-radioactive or very, very nearly so? As it happens, yes. A line of radioactive cosmetics introduced in 1930 Each element comes in varieties called isotopes whose atoms differ in...
The word octanol is derived from the Latin word octo, meaning eight, and the substance is so named because it has eight carbon atoms. There are four different types, or isomers, commonly referred to as octanol that have similar though not identical properties. These four types are known more...
As we all know,graphiteis composed of sheets of hexagons of carbon atoms joined by covalent bonds. Between each sheet, there are weaker (pi) bonds along which the electrons are free to move. It is the movement of electrons between the layers that explains this unusual property of graphite....
In a 2005 interview, Moore himself admitted that "...the fact that materials are made of atoms is the fundamental limitation and it's not that far away...We're pushing up against some fairly fundamental limits so one of these days we're going to have to stop making things smaller."5 ...