OXIDES

Cazan Oana –IT Bătăneanţ Denisa - chimie Plotuna Ana Maria – lb. engleză

DEFINITION

Oxides are composed of substances in which composition enter one or more atoms of oxygen or atoms with one or more nonmetal atoms.

Examples of formulates of oxides:

1. CaO2. P2o5

3. CO2

4. NO2

5. SO2

6. SiO2

7. Cu2O8. MgO9. CuO10.PbO

The naturale state shows us where to find oxides in nature.

STATE

THE NATURALE

The Carbon Dioxide-CO2

It found free into the atmosphere andinto the carbonated waters.

Aluminium Oxide-It is found in nature as crystalized.

Al2O3

Arsenic trioxide  - it is fond in the form of poison

Silicon dioxide - It is the mineral form of sand.

SiO2

Sulphur dioxide -SO2

It is found as a toxic gas

CERIUM OXIDE

It can be found as yellowish-white

powder

THE CLASSIFICATION

OF OXIDE

Clasification by chimical nature of the item is: -nonnemetallic oxides- acids -metalic oxides- basics

ACIDES BASICCO2 CaO

SO2 Al2O3

SO3 Fe2O3

NO2 CuO

General scheme for the reactions with

waternonmetal oxide + H2O => saltsmetal oxide + H2O => bazenonmetal oxide+base => H2O + saltsmetal oxide + acid => H2O + salts-at low temperatures, forms oxides which react with each other and they form salts-the oxides don’t maintain the combustion

Chimical properties

Chimical equations:CaCO3 = CO2 + CaO CuCO3 = CO2 + CuO2Ca + O2 = 2CaOC+ O2 = CO2

CO2 + H2O = H2CO3

CaO + H2O = Ca(OH )2

NaOH + CO2 => Na2CO3 + H2O

2HNO3 + CaO => Ca(NO3)2 + H2O

S + O2 = SO2

SO2 + H2O = H2SO3

Ca(OH)2 + CO2 = CaCO3 + H2O

CaO + H2SO4 = CaSO4 + H2O

PHYSICAL PROPERTIES

State of matter: 1. SOLID – calcium oxide – CaO 2. LIQUID – sulfur dioxide - SO2 3. GAS – carbon dioxide – CO2 4. PLASMA-MAGNETITE – iron oxide or black iron oxide - Fe3O4 5. SOLID RADIOACTIVE-uranium -U

PHYSICAL PROPERTIES

Calcium oxide-solid-odorless-density 3,37 g x cm (Raise to the power of -3Carbon dioxide-odorless-gas-comprising 0.03% of the atmosphereSulfur dioxide-pungent odor-gas-solubility 112g/l waterMagnetite (iron oxide)-odorless-solid-magneticUranium ore-gas, solid-radioactive metal-toxic

Oxid de calciu colour - white

Carbon dioxideis colorless

Sulfur dioxide is coloreless

Magnetite (iron oxide)Colour:blac

k

URANIUM ORECOLOUR – DEPENDS

WHERE IS USED

USES

PbO (plumb oxid) - it is used in medicine and painting;SiO2(sulf dioxide) – SAND- it is used in constructions;Al2O3(sulfur trioxide) – ruby, sapphire (gemstones) , it is used for jewelry craf;MnO2(manganese dioxide) – it is used in automotive industry and the industry of the thermoelectric power station ;SiO2(sulphur dioxide) – amethyst and rose quartz – it is used for jewerly craf;CO2(carbon dioxide) – (the gaz form the water boottles)- it is used to process the carbonate mineral

water , juice and to extract the beer form the barrels; it is also used to extinguishing fires;

CaO(calcium oxide) - it is used in constructions;

It is found most often in fertilizers but is also included in the refractory materials –for furnaces in the metallurgy industry.

USES: Magnesium oxide -

MgO