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Dry ice with a hole drilled in it.Filled with little pieces of
Magnessium.Magnessium is lit then covered with dryice.The reaction
starts.This is why not to use a C02 fire extinguiser on magnessium fires
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Calcium carbide is the chemical compound with the formula CaC2.
The material is colorless, but most samples appear black through to
grayish white lumps, depending on the grade. Its is used as a source of
acetylene.
Production
Calcium carbide is produced industrially in an electric arc furnace loaded with a mixture of lime and coke at about 2000 °C, this method has not changed since its invention in 1888:
CaO + 3C → CaC2 + CO
The high temperature required for this reaction is not practically
achievable by traditional combustion, so the reaction is performed in
an electric arc furnace with graphite electrodes. The carbide product produced generally contains around 80% calcium carbide by weight. The carbide
is crushed to produce small lumps that can range a few mm up to 50mm.
The impurities are concentrated in the finer fractions. The CaC2
content of the product is assayed by measuring the amount of acetylene
produced on hydrolysis. As an example the British and German standards
for the content of the coarser fractions are 295 L/kg and 300 L/kg
respectively. Impurities present in the carbide include phosphide, which produces phosphine when hydrolysed.
This reaction was an important part of the industrial revolution in chemistry. In the USA this occurred as a product of massive amounts of cheap hydro-electric power liberated from Niagara Falls before the turn of the 20th century.
The method for the production in an electric arc furnace was discovered independently by T. L Willson and H. Moissan in 1888 and 1892
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