Which one of the following countries provides the best example of radial drainage? Which of the following countries is not in the African continent? FSLRC stands for -. The acids generally stored in batteries is. In the Gupta age, Varahamihira wrote the famous book, Brihat Samhita. In the Bhopal Gas Tragedy of , which was the gas that leaked out?
Which one of the following is the first National Park established in India? Mahatma Gandhi returned to India, leaving South Africa for ever in. Our Skin becomes dark, when exposed to excess sunlight. Wisdom teeth are. Which of the following is a physical change? Which one among the following statements about stomach is not correct? To promote cycling as a pollution-free and healthy mode of transport, school and college students took out a bicycle rally in - on December 13, Which gas is filled in refrigerators?
This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things! By distilling bituminous coal in retorts to obtain gas for illumination, or by burning it in kilns or pits, the residue left behind is called coke, which is simply coal charcoal, and is nearly pure carbon.
Skip to content Technology. February 27, Joe Ford. Table of Contents. Materials that are high in sp 3 hybridized bonds are referred to as tetrahedral amorphous carbon owing to the tetrahedral shape formed by sp 3 hybridized bonds , or diamond-like carbon owing to the similarity of many of its physical properties to those of diamond. Carbon nanomaterials make up another class of carbon allotropes. Fullerenes also called buckyballs are molecules of varying sizes composed entirely of carbon that take on the form of hollow spheres, ellipsoids, or tubes.
Buckyballs and buckytubes have been the subject of intense research, both because of their unique chemistry and for their technological applications, especially in materials science, electronics, and nanotechnology. Carbon nanotubes are cylindrical carbon molecules that exhibit extraordinary strength and unique electrical properties and are efficient conductors of heat. Nanobuds therefore exhibit properties of both nanotubes and fullerenes.
Glassy or vitreous carbon is a class of carbon widely used as an electrode material in electrochemistry as well as in prosthetic devices and high-temperature crucibles. Its most important properties are high temperature resistance, hardness, low density, low electrical resistance, low friction, low thermal resistance, extreme resistance to chemical attack, and impermeability to gases and liquids. Other allotropes of carbon include carbon nanofoam, which is a low-density cluster assembly of carbon atoms strung together in a loose three-dimensional web; pure atomic and diatomic carbon; and linear acetylenic carbon, which is a one-dimensional carbon polymer with the structure - CC n -.
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:. Skip to main content. Nonmetallic Elements. Search for:. Allotropes of Carbon. Learning Objective Describe the properties of the allotropes of carbon. Key Points Diamond is a well-known allotrope of carbon that exhibits hardness and high dispersion of light.
It is the hardest known natural mineral and finds applications in cutting, drilling, and jewelry, and as a potential semiconductor material. Graphene is a single layer of carbon atoms arranged in one plane; layers of graphene make up graphite.
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