Search results
Results From The WOW.Com Content Network
Often, the metal (such as aluminium, iron, or copper) must be powdered because many metals passivate by forming protective layers of the metal fluoride that resist further fluoridation. [7] The alkali metals can react with fluorine explosively, while the alkaline earth metals react not quite as aggressively.
The majority of aluminium fluoride is produced by treating alumina with hydrogen fluoride at 700 °C: [4] Hexafluorosilicic acid may also be used make aluminium fluoride. [11] H 2 [SiF 6] + Al 2 O 3 + 3 H 2 O → 2 AlF 3 + SiO 2 + 4 H 2 O. Alternatively, it is manufactured by thermal decomposition of ammonium hexafluoroaluminate. [12]
Aluminium carbide – Al 4 C 3 [12] Aluminium iodide – AlI 3 [13] Aluminium nitride – AlN [14] Aluminium oxide – Al 2 O 3 [15] Aluminium phosphide – AlP [16] Aluminium chloride – AlCl 3 [17] Aluminium fluoride – AlF 3 [18] Aluminium hydroxide – Al(OH) 3 [19] [20] Aluminium nitrate – Al(NO 3) 3 [21] Aluminium sulfide – Al 2 S 3 ...
1. Tomatoes. The high acidity in tomatoes can react strongly with aluminum, causing tiny bits of metal to leach into the food. While this can impart that gross metallic taste, the bigger issue is ...
All vegetation contains some fluoride, which is absorbed from soil and water. [10] Some plants concentrate fluoride from their environment more than others. All tea leaves contain fluoride; however, mature leaves contain as much as 10 to 20 times the fluoride levels of young leaves from the same plant. [18] [19] [20]
Aluminium monofluoride, also known as fluoridoaluminium, is the chemical compound with the formula AlF. This elusive species is formed by the reaction between aluminium trifluoride and metallic aluminium at elevated temperatures but quickly reverts to the reactants when cooled. [ 1 ]
Alkali metals cause explosions and alkaline earth metals display vigorous activity in bulk; to prevent passivation from the formation of metal fluoride layers, most other metals such as aluminium and iron must be powdered, [21] and noble metals require pure fluorine gas at 300–450 °C (572–842 °F). [24]
Fluoride was measured at 8 milligrams per liter in the groundwater of some villages in China, while some Canadian waters contain levels of less than 0.05 milligrams per liter, according to a World ...