Wednesday, August 26, 2015

Transition metals

Transition metals = Transition elements
They create complex ions which dye solutions

Titanium
Lightweight, rigid, corrosion-resistant alloys are used for manufacturing aircraft wings, artificial joints, pacemakers, jewelry

Chromium
White metal
In nature, it occurs as chromite
It is used as an anti-corrosive coating of steel objects, to chrome plating car parts and cutlery

Cobalt
Silvery-white ferromagnetic metal
It occurs in compounds with sulfur and arsenic
From the alloys with iron are produced magnets

Nickel
Ferromagnetic metal
It is used for plating and manufacturing batteries
Alloys finds application in the manufacture of coins

Niobium
Rare gray metal
Alloys used in the aircraft and aerospace engineering

Silver
Soft
From silver is produced jewelery, coins
Halides are used in photography

Cadmium
It is used as part of the control rods of nuclear reactors

Tungsten =  Wolfram
Hard, gray, corrosion-resistant
To the alloys for tools and fibers into bulbs

Platinum
To produce electrical contacts, jewelry, implants, pacemakers

Gold
Soft, shiny, yellow, very unreactive
In nature in a pure state
To increase hardness is added Cu and Ag
Alloys are used in jewelery, dentistry

Mercury = Quicksilver =  Hydrargyrum
Toxic, silvery-white liquid metal
In thermometers, barometers

Iron
Soft, white, magnetic
In nature only in compounds
Is obtained from hematite or magnetite due to melting in a blast furnace
Creates ionic and covalent compounds
By reaction with atmospheric moisture it corrodes

Iron production in a blast furnace
Iron produced in a blast furnace is crude
Contains 5% carbon and 4% other impurities - eg .: sulfur
Most of pig iron is processed into steel

Steel
Alloy of Fe and C (<1.5%)
C increases the hardness and strength but reduces the ductility and malleability
It is produced by removing impurities from molten pig iron
Ferrous scrap, pig iron and lime is charged into the furnace, where oxygen is blown, which oxidizes impurities

Copper
In nature, it occurs in a pure state and compounds - eg.: chalcopyrite
Unreactive, on air it loses its luster and covers a green layer of alkaline sulfate
Electric wires. lines, water pipes, heating systems are produced from copper
Alloys: brass contains Zn, Bronze contains Cn
Cupric chloride is used in pyrotechnics

Spelter = Zinc
Silvery, soft, on air it loses its shine
In nature, it occurs in sphalerite
It is obtained by roasting the ore to form ZnO and the reduction of coke
Zinc oxide is contained in creams for baby rash

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