1. Chemistry Presentation Name: Wing Sze Class: F.3B (28) Compound assigned: Na2O

2.  Chemical formula : Na2O  Constituent elements: Sodium + Oxygen  Type of bonding: Ionic Bond  Formation of compound: By burning sodium in limited supply of oxygen  Heat needed to start the reaction: Gentle -Sodium oxide-

3. -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/cm 3 Electrical conductivity ----- Electrical conductive

4. -Chemical properties of Na2O-  Reacts violently with water to form NaOH (Sodium Hydroxide)  Very basic  Reducing

5. -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

6. -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: Na 2 O + SiO 2 → Na 2 SiO 3 -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.

7. -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

8. -Potential Hazards- ///Fire hazard///  Non-combustible, does not burn itself in fire  when heated to decomposition it emits toxic, irritating fumes of Na 2 O  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

9. 哥士的 =CAUSTIC SODA= Sodium Hydroxide=Strong Base Misuse of Sodium hydroxide (formed when sodium oxide react with water) can really be disastrous!!!!!!!!!!!

10. -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

11. -Resources- http://www.lookchem.com/SODIUM http://hk.knowledge.yahoo.com/question/question?qi d=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_o r_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/di sodium_oxide.html http://wn.com/sodium_oxide

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