Transcript Advantages and Disadvantages of Oxides

ADVANTAGES AND
DISADVANTAGES OF
OXIDES
WHICH COMPOUNDS DO WE
RECOGNISE AS OXIDES?
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Oxide is a binary compound formed between
elements and oxygen.
Oxides of nonmetals are covalent compounds
having simple molecules(e.g. CO, CO2, SO2) or
giant molecular lattices (e.g. SiO2). They are
typically acidic or neutral.
Oxides of metals are ionic, containing O2- ion.
They are generally basic or amphoteric.
OZONIDES
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A group of compounds formed by reaction of
ozone with alkali metal hydroxides and formally
containing the ion O3-.
PEROXIDES
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A group of inorganic compounds that contain O2
2- ion. They are notionally derived from hydrogen
peroxide, H2O2, but these ions do not exist in
aqueous solutions due to extemely rapid
hydrolysis to OH-.
SUPEROXIDES
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A group of inorganic compounds containing the
O2- ion. They are formed in significant quantities
only for sodium, potassium, caesium and
rubidium. They are very powerful oxidizing
agents and reacts vigorously with water to give
oxygen gas and OH- ions. The superoxide ion has
an unpaired electron and is paramagnetic and
colored (orange).
CARBON DIOXIDE (CO2)
 Dry
ice
 Fire extinguishers
 Constituent of medical gases
 Carbonated drinks
 Greenhouse
effect
GREENHOUSE EFFECT
CARBON MONOXIDE (CO)
 Metallurgical
processes
 A natural part of human body
 Toxity
SULPHUR DIOXIDE (SO2)
 Reducing
agent
 Fumigant
 Food
preservative
 Bleaching
 Manufacturing sulphuric acid
 Acid
rains
ACID RAINS
TITANIUM DIOXIDE (TIO2)
 White
pigment
 Tattoo pigment
 In cosmetic products (sunscreen)
 Food colouring
 Dental bleaching products
 Substitute for snow
 Osseointegration
 25 terabyte titanium oxide-based disc
TITANIUM DIOXIDE (TIO2)
SILICON DIOXIDE (SIO2)
 Silica
brick
 Silica glass
 Ordinary glass, glazes, enamels
 Silica gel
 Making of jewelry and hardstone
carvings
SILICON DIOXIDE (SIO2)
SILICON DIOXIDE (SIO2)
CALCIUM OXIDE (CAO)
 Making
calcium hydroxide
 Cheap alkali for treating acid soil
 Producing slag
 Component of Greek fire (past)
 Producing mortar
 Producing calcium carbide (CaC2)
CALCIUM OXIDE (CAO)
OXIDES AS DYES
White: titanum oxide
 Black: copper (II) oxide
 Green: chrome oxide
 Red: copper (I) oxide
 Orange: iron oxide
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IRON OXIDES
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Iron (II) oxide (FeO)
- Pigment (also in tattoo ink)
Iron(II,III) oxide (Fe3O4) (magnetite)
- Black pigment, natural magnet, industrial
processes
Iron(III) oxide (Fe2O3) (hematite)
- Red pigment, jewelry, magnetic resonance
imaging (as contrast agent)
IRON (II) OXIDE
IRON (II,III) OXIDE
IRON (III) OXIDE
NITROGEN OXIDES
Nitric oxide (NO)
- plays vital role in various biological processes
 Dinitrogen oxide (N2O)
- anaesthetic gas, aerosol propellant
 Nitrogen dioxide (NO2)
- large scale pollutant
- responsible for reddish colour of mushroom
clouds
- plays role in atmospheric chemistry, including
the formation of tropospheric ozone
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DINITROGEN OXIDE
NITROGEN DIOXIDE
BIBLIOGRAPHY
Oxford Dictionary of Chemistry
 www.chemdex.org
 www.wikipedia.org
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