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#6466 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Beryllium oxide can be prepared by calcining (roasting) beryllium carbonate, dehydrating beryllium hydroxide or igniting the metal:
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#6467 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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BeCO3→ BeO + CO2
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#6468 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Be(OH)2 → BeO + H2O
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Posts: 28,544
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#6469 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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2 Be + O2 → 2 BeO
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#6470 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Igniting beryllium in air gives a mixture of BeO and the nitride Be3N2.
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#6471 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Unlike oxides formed by the other group 2 (alkaline earth metals), beryllium oxide is amphoteric rather than basic.
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#6472 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Beryllium oxide formed at high temperatures (>800°C) is inert,
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#6473 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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but dissolves easily in hot aqueous ammonium bifluoride (NH4HF2) or a hot solution of concentrated sulfuric acid (H2SO4) and ammonium sulfate ((NH4)2SO4).
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#6474 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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BeO adopts the hexagonal wurtzite structure form.
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#6475 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Beryllium is a miracle metal, lighter than aluminum yet stiffer than steel, making it perfect for many military applications.
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#6476 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Since the end of the Cold War, decline in military demand for beryllium has led Brush and its customers to ramp up commercial applications of the metal.
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#6477 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Beryllium is also used in such varied manufactured goods as electronics, automobiles, telecommunications, x-ray machines, and dental fixtures.
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#6478 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Brush Wellman began researching beryllium in 1921, opened its first commercial facility to produce the metal in 1931 and continues to operate to this day. The primary consumer of beryllium -
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#6479 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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it was the top consumer until a recent surge in commercial uses - has been the U.S. government, which first used the metal to build better atomic weapons. Workers were not told about the dangers of beryllium dust, nor were they aware that the government and industry knew of workers dying from on the job exposures.
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#6480 |
legend
Join Date: Oct 2006
Location: Independence, MO
Casino cash: $-3337903
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Over 40 cases of chronic beryllium disease, including seven deaths, and about 500 cases of acute disease, including nearly a dozen deaths, had been reported in the US by September 1947. (Read the document)
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