1. Petra Kučerová Michaela Salajková
Phosphorus
Petra Kučerová
Michaela Salajková

2. Physical properties Non-metallic Density: 1,83 g/cm3
Melting point: 41 °C
Boiling point: 277 °C
Standart state: solid
Colour: white, red and black

3. Chemical properties The 15th group of periodic table
3 alotropic modifications
Insoluble in water
Soluble in carbon disulphide (= rozpustný v sirouhlíku)
Biogenic element

4. White phosphorus Waxy (= měkký jako vosk) Toxic Pyrophoric
(= samozápalný)
Phosphorescing vapors
(= fosforeskující páry)
Very reactive
By heating to 250 °C changes into the red modification

5. Red phosphorus Non-toxic Less reactive than the white one
Amorphous substance
(= amorfní látka)
Stable on air

6. Black phosphorus Crystal structure Metallic lustre (= kovový lesk)
Heat conductor
(= vodič tepla)
Conductor of electric current
(= vodič el. proudu)
The least reactive of all modifications
Non-toxic

7. History Discovered in 1669 by Hennig Brand
Isolated from urine (= získán z moči)
Name – from Greek - Phosphoros = „bringer of light“
Když hledal kámen moudrosti

8. Occurence (= výskyt) Only compounds (apatite, phosphorite)
Heavy occurence in the earth´s crust (= zemská kůra)

9. DNA, RNA

10. Lipids, bones

11. Uses 1 Safety matches Pyrotechnics Coca-cola
Bone-ash - monocalcium phosphate – baking powder
(= kostní moučka; prášek do pečiva)

12. Uses 2 Fertilizers (= hnojiva) Pesticides Alloys (= slitiny)
Clean agents
Water softeners

13. Hazards and risks 0,1 g of white phosphorus is deadly toxic
Chronic poisoning of white phosphorus leads to necrosis of the jaw („phossy jaw“)

14. Thanks
for your attention