Notes, Exercises, Videos, Tests and Things to Remember on Introduction to Zinc
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The element was discovered as an element in 1746, but known to the Greeks and Romans before 20BC.
Origin of the name
derivation of the name was from the German word, 'zinc'.
419.527°C, 787.149°F, 692.677 K
907°C, 1665°F, 1180 K
7.134 gram per centimeter
State at 20 °C
The compounds of zinc are:
The term hydride is used to indicate compounds of the type MxHy and it is not necessarily that indicated any compounds listed would behave as same as hydrides chemically.
Calamine → ZnCO3
Zincite → ZnO
Zinc blende → ZnS
Willemite → ZnO.SiO2
It is extracted from ZnS.
During the process, the impurities like arsenic, phosphorus, sulphur etc. are expelled out in the form of volatile oxide.
When the furnace is heated by burning to about 1400, the oxide ores in briquettes gets reduced and vapors of zinc and carbon monoxide are formed and carried to the condenser. The vapors of zinc condense in the condenser in the form of molten mass called zinc splinter.
Zn – 2e- → Zn2+
Zn2+ + 2e- → Zn
$$Zn+HCl\longrightarrow ZnCl_2+H_2O (with\space HCl\space it\space forms\space zinc\space chlorise)$$
Zinc is found in several ores in the form of zinc blende and calamine. The principal mining areas are in China, Australia, and Peru. Commercially, zinc is obtained from its ores by concentrating and roasting the ore, then reducing it to zinc by heating with carbon or by electrolysis. World production is more than 11 million tons a year.
pulse, Tracy. Introduction to chemistry. u.s.a: flex book, 2010.
Pathak, Sita Karki. The Text Book of Chemistry. Kathmandu: Vidhyarthi Pustak Bhandar, 2012.