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Chemistry test help
Submitted by Anonymous on 12 October 2004 - 2:24am.
I've a Chemistry tes in 24 hours and I need a direct help. What is the specialities of yellow phosphorus and white phosphorus? How they differ from each other? How they differ from the other allotropes of phosphorus? Are there other allotropes of phosphorus? Name them please. |
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white phosphorous spontaneously combusts in the presents of oxygen. Its used on the nose of tracer bullets, to see the path of the bullet. I think it may have been used to ingnite napalm bombs as well. Good luck
Thanks very very very much much. You answered me just a single hour after my question.
Continuing the problem: My book says yellow phosphorus is dangerously flammable but white phosporus is not mentioned (which may contradict with Scarf's sentences), what's the ral solution for this? One hour later and it is the test. Anyone who can help please be quick!
I wouldn't doubt that both are flamable.
Physical Properties
* White or yellow white phosphorus is either a yellow or colorless, volatile crystalline solid that darkens when exposed to light and ignites in air to form white fumes and greenish light. (1)
* The chemical symbol for white phosphorus is P; the vapor has the formula P4; and the atomic weight is 30.97 g/mol. (2)
* The vapor pressure for white phosphorusis 0.026 mm Hg at 20 EC. (2)
Uses
* White phosphorus is used in the manufacture of munitions, pyrotechnics, explosives, smoke bombs, in artificial fertilizers, rodenticides, phosphor bronze alloy, semiconductors, electroluminescent coating, and chemicals. (1)
Little thanks... but you've misunderstood my problem... I'm asking about yellow phosphorus, not white phosphorus... and test is in an hour, I cannot use the computer anymore......
This is too late for the test, but P was once thought to exist in 4 or five allotropes: white, yellow, red, and violet or black. White phosphorus is a waxy solid that is both highly toxic and highly flammable in air. Red phosphorus is more stable and ignites only when heated. Black/violet phosphorus is non-flammable and formed under high temperatures and pressures. When exposed to sunlight, white phosphorus slowly converts to red, turning yellowish in the process, hence the term yellow phosphorus. White phosphorus itself exists in two allotropes, alpha and beta with a transition point at -3.8 C.
Well, thanks very much. My teacher didn't take the phosphorus question into the test.