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Julian Austin - The Red and White
Red White
What does red and white phosphorus have such different properties?
Two important allotropes of phosphorus are white and red. White phosphorus, P4, has a melting point of 44.1 C and spontaneously reacts with oxygen. Red phosphorus, a network solid, melts at 280 C and is stable in air. Use your knowledge or intermolecular and intramolecular bonding to explain why these two forms of the same element have such different properties?
White phosphorus, or yellow phosphorus, or simply tetraphosphorus (P4) exists as molecules made up of four atoms. The tetrahedral arrangement results in ring strain and instability. The molecule is described as consisting of six single P-P bonds. Two different crystalline forms are known. The α form, which is stable under standard conditions, has a body-centered cubic crystal structure. It transforms reversibly into the β form at 195.2 K. The β form is believed to have a hexagonal crystal structure.
Red phosphorus may be formed by heating white phosphorus to 250 °C (482°F) or by exposing white phosphorus to sunlight. Red phosphorus exists as an amorphous network. Upon further heating, the amorphous red phosphorus crystallizes. Red phosphorus does not ignite in air at temperatures below 240 °C, whereas white phosphorus ignites at about 30 °C.
Northern Cree - Red & White (Driving Me Crazy)
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