Carbide lamp

Ethyne was burned in carbide lamp (miners headlamp). 

Carbide lamps were used as a source of light for miners, but they tended to explode if not carefully maintained. Calcium carbide reacts with water to produce acetylene, (a) Write the balanced equation for the reaction, (b) What number... 

A miner s carbide lamp. Water in the upper chamber slowly drips onto calcium carbide in the lower chamber, generating acetylene. 

Fig. 6 Carbide lamp. Ethyne (acetylene) was used in power miners lamps and bicycle lights in earlier times because of its bright flame. It is still used today for welding because of its high combustion temperature. The inflammable gas is produced when water is poured onto the carbide.

Calcium carbide, CaC2, reacts with water to form calcium oxide, CaO, and acetylene, C2H2. Acetylene is a fuel that combines with oxygen in an exothermic reaction to produce water and carbon dioxide. This combination of reactions was used to produce light in lanterns known as carbide lamps. A certain lamp produces 10.0 L of C02(g) at STP. How many grams of calcium carbide must have reacted in the lamp ... 

See more on 1,3-Butadiene See more on Acetic Acid See more on Vinyl Chloride See more on 1,4-Butanediol See more on Acetaldehyde See more on Carbide Lamps See more on Acetylene See more on Latex See more on Rubber See more on Benzene See more on Ethylene See Who was Reppe ... 

Calcium carbide (acetylene or calcium carbide lamps)... 

Niobium pentoxide can be reduced with carbon in a two-step process, called the Balke process. Formation of the carbide is the first step. The oxide is mixed with the stoichiometric amount of lamp black, placed in a carbon cmcible, and heated in vacuum to 1800°C ... 

The original drive for the development of modem carbon fibers, in the late-1950s, was the demand for improved strong, stiff and lightweight materials for aerospace (and aeronautical) applications, particularly by the military in the West. The seminal work on carbon fibers in this period, at Union Carbide in the U.S.A., by Shindo, et al, in Japan and Watt, et al, in the U.K., is well-documented [4-7]. It is always worth pointing out, however, that the first carbon fibers, prepared from cotton and bamboo by Thomas Edison and patented in the U.S.A. in 1880, were used as filaments in incandescent lamps. 

Calcium carbide, CaC2, reacts with water to form calcium hydroxide and the flammable gas ethyne (acetylene). This reaction was once used for lamps on bicycles, because the reactants are easily transported, (a) Which is the limiting reactant when 1.00 X 102 g of water reacts with 1.00 X 102 g of calcium carbide (b) What mass of ethyne can he produced (c) What mass of excess reactant remains after reaction is complete Assume that the calcium carbide is pure and that all the ethyne produced is collected. The chemical equation is... 

The industrial practice for the production of tantalum consists of two steps. In the first, the carbide is made by charging a graphite crucible with an intimate, pelletized mixture of lamp black and tantalum pentoxide and heating it in a high-frequency furnace under a dynamic vacuum (10 torr). In the next step, the ground carbide and the requisite amount of tantalum pentoxide are mixed, palletized, and fed to a reduction furnace where the reduction to the metal occurs. The formation of tantalum carbide as well as the reduction to the metal occur at about 2000 °C. The product leaving the reduction furnace is in the form of pellets or roundels (small cylinders) of porous metal, usually sintered together. 

The silvery, shiny, ductile metal is passivated with an oxide layer. Chemically very similar to and always found with zirconium (like chemical twins, with almost identical ionic radii) the two are difficult to separate. Used in control rods in nuclear reactors (e.g. in nuclear submarines), as it absorbs electrons more effectively than any other element. Also used in special lamps and flash devices. Alloys with niobium and tantalum are used in the construction of chemical plants. Hafnium dioxide is a better insulator than Si02. Hafnium carbide (HfC) has the highest melting point of all solid substances (3890 °C record ). 

Calcium carbide (CaC ) has a garlic-like odor and reacts with water to form acetylene gas plus calcium hydroxide and heat. In the past, it was used in miners lamps to continuously produce a small acetylene flame to provide some illumination in coal mines. 

This was first burned for miners lamps, but acetylene was soon recognized as a valuable chemical intermediate. [Recall that Union Carbide started as a company that produced acetylene from CaC.]... 

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