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Carbides are a class of compounds composed of carbon and an electro positive atom Titanium Carbide Lattice structure of titanium carbide KEY POINTS Carbides are generally formed at high temperatures (> 1500 °C). Carbides are generally quite stable and exhibit high melting points. Carbides can be classified as salt-like, interstitial, and covalent.. In chemistry, carbides are compounds composed of  carbon  and less-electronegative elements (Figure 1). They are usually distinguished by their chemical bonding. They are generally prepared from metals or  metal  oxides at high temperatures (1500 °C or higher) by combining the metal with carbon. Carbides are used in key industrial applications, and their naming is not systematic. Saline Carbides Salt-like (saline) carbides are composed of the highly electropositive atoms, such as the alkali, alkali earth, and  group -III metals, mixed with carbon.  Aluminum forms carbides, but other elements from group XIII do not. These

Minerals and Their Uses 40 common minerals and their uses Every segment of society uses minerals and mineral resources everyday. The roads we ride or drive on and the buildings we live learn and work in all contain minerals. Below is a selected list of commonly used metallic and nonmetallic minerals, ore minerals, mineral byproducts, aggregates, and rock types that are used to make products we use in our daily life. Aggregates Natural aggregates include sand, gravel, and crushed stone. Aggregates are composed of rock fragments that may be used in their natural state or after mechanical processing, such as crushing, washing, or sizing. Recycled aggregates consist mainly of crushed concrete and crushed asphalt pavement. Aluminum Aluminum is the most abundant metallic element in the Earth's crust. Bauxite ore is the main source of aluminum. Aluminum is used in automobiles and airplanes (36%), bottling and canning industries (25%), building and electrical (14%) and in other