2. Phosphorus burns in a small amount of chlorine: 2p+3cl? =2PCl

3. Phosphorus burns in sufficient chlorine: 2p+5cl? =2PCl？

4. Co-heating of phosphorus and concentrated sulfuric acid: 2p+5h? So what? =2H？ Po. +5SO？ ↑+2H？ o？

5. Co-heating of phosphorus and concentrated nitric acid: P+5 HNO? =H？ Po. +5 no? ↑+H？ o？

6. Co-heating of phosphorus and dilute nitric acid: 3P+5HNO? +2H？ O=3H？ Po. +5NO↑？

Extended data:

1, the reaction of phosphorus pentoxide with cold water: p? o？ +H？ O=2HPO

2, phosphorus pentoxide and hot water reaction P? o？ +3H？ O=2H？ Post office

3. The reaction of phosphorus pentoxide with sodium hydroxide solution: P? o？ +6NaOH=2Na？ Po. +3H？ o，P？ o？ +6OH？ =2PO？ +3H？ o？

Physical properties:

There are several allotropes of elemental phosphorus. Wherein white phosphorus or yellow phosphorus is a colorless or yellowish transparent crystalline solid. The density is1.82g/cm3. The melting point is 44.65438 0℃, the boiling point is 280℃ and the ignition point is 40℃. It glows in the dark. It stinks. Highly toxic. White phosphorus is almost insoluble in water and soluble in carbon disulfide solvent.

In nature, phosphorus exists in the form of phosphate and is an important element of life. It exists in cells, protein, bones and teeth. In phosphorus-containing compounds, phosphorus atoms are connected to other atoms or groups through oxygen atoms.

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