Chemistry Presentation

Name: Wing SzeClass: F.3B (28)

Compound assigned:

Na2O

Chemical formula : Na2OConstituent elements: Sodium + OxygenType of bonding: Ionic BondFormation of compound:

By burning sodium in limited supply of oxygen

Heat needed to start the reaction: Gentle

-Sodium oxide-

-Physical properties of Na2O-

• Melting point ----------- 1132°C• Boiling point ----------- 1950 °C (decomposes)• Physical state at room temperature -------

Solid• Color ----------- White• Solubility in water ----------- Soluble (react

with water to form NaOH )• Density ----------- 2.27 g/cm3

• Electrical conductivity ----- Electrical conductive

-Chemical properties of Na2O-

Reacts violently with water to form NaOH (Sodium Hydroxide)

Very basicReducing

-Laboratory preparation for Na2O-

Store in low humidity environment to prevent violent reaction between Sodium oxide and water vapor in air which will then form strong alkali, Sodium hydroxide

Put on protective gloves when handling because of its high corrosive nature

Put on safety glasses as it will result in blindness when coming into contact with eyes

Make sure that the storing container is not contaminated with water

-Uses of Na2O-

Street lights (high pressure sodium lamp) -Due to the property of high brightness -Need relatively small amount of energy to glow Highway lights -Due to the property of high brightness Used in ceramics as a glaze additive A significant component of glasses and windows -Sodium oxide does not explicitly exist in glasses, since glasses are complex cross-linked polymers.-It is added in the form of "soda" (sodium carbonate). -Chemical formula of glass: Na2O + SiO2 →Na2SiO3

-Manufactured glass contains around 15% sodium oxide, 70% silicon dioxide and 9% calcium oxide.-The sodium carbonate "soda" serves as a flux to lower the temperature at which the silica melts.

-Potential Hazards-

///Health hazard/// Very corrosive and irritating to skin, eyes, and

mucous membranes Inhalation, ingestion of vapors, dusts or other

substances containing sodium oxide may cause severe injury, burns or death

Reaction with water or moist air will release toxic, extremely corrosive or flammable gases

Reaction with water will generate large amount of heat that will greatly increase the concentration of toxic, irritating fumes in the air

Runoff from fire control or dilution water may be corrosive and toxic and cause pollution

-Potential Hazards-///Fire hazard/// Non-combustible, does not burn itself in fire when heated to decomposition it emits toxic,

irritating fumes of Na2O Vapors may accumulate in confined areas

(basement, tanks, hopper cars, tank cars) over a long period, which will later react with water violently, releasing toxic gases

Contact with metals may evolve flammable hydrogen gas

Containers may explode when the contained sodium oxide is heated or when the container is contaminated with water

哥士的=CAUSTIC SODA=

Sodium Hydroxide=Strong Base

Misuse of Sodium hydroxide (formed when sodium oxide react with water) can really be disastrous!!!!!!!!!!!

-Special characteristics of Na2O-

• Mixtures with phosphorus (V) oxide react violently when warmed or on contact with moisture.

• Reacts vigorously with water and nitric oxide above 100°C

• Ignites when mixed with 2, 4-dinitrotoluene

• Corrosive• Non-flammable• Irritant to skin

-Resources-

• http://www.lookchem.com/SODIUM• http://hk.knowledge.yahoo.com/question/question?

qid=7010020601568• http://en.wikipedia.org/wiki/Sodium_oxide• http://www.britannica.com/EBchecked/topic/552271/

sodium-oxide• http://wiki.answers.com/Q/

Is_Sodium_oxide_acidic_or_basic• http://www.buzzle.com/articles/sodium• http://wn.com/ionic_conductivity• http://www.minhhieutrans.com/sodium-oxide.htm• http://www.webelements.com/compounds/sodium/

disodium_oxide.html• http://wn.com/sodium_oxide

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