Transcript Shirley Kam
Shirley Kam (9) F.3A
(10-11) F3 Chemistry Individual Project Work Ionic & Covalent compounds
Compound:
Magnesium sulphide (MgS)
Magnesium sulphide
• Formula:
MgS
• Electron diagram:
Magnesium sulphide (MgS)
Physical properties: • Melting point: • Boiling point:
>2000
°
C No data
• Physical state at room temperature:
Solid
• Colour:
reddish-brown, white or red
• Density:
2.68 g/cm3
• Solubility in water:
decomposes
• electrical conductivity:
Semi-conductor
Magnesium sulphide (MgS)
Chemical properties • Laboratory preparation: MgS is formed by the reaction of sulphur or hydrogen sulphide with magnesium.
Magnesium sulfide, MgS, can be produced by
heating magnesium to 500
°
-600
°
C with sulfur
or
SO2
and H2S.
*the process takes place in fume cupboard as the compound will produce toxic gas • Reactivity towards water: Give hydrogen sulphide and magnesium hydroxide • Reactivity with oxygen: Form the corresponding sulfate, magnesium sulfate
Magnesium sulphide (MgS)
Uses: • BOS steelmaking • wide band-gap direct semiconductor of interest as a blue-green emitter • Phosphor making which can be used in radiation dosimetry as optically stimulated luminescence and thermoluminescence dosimeters, in radiography as infrared sensors, etc.
Magnesium sulphide (MgS)
Potential hazards: • Fire and explosion hazards: When heated to decomposition, it may
emit toxic fumes
of SOx. Sulphides can react violently when exposed to flame or oxidizers. Hydrogen sulphide is evolved upon contact with water/moisture.
Magnesium sulphide (MgS)
• Health hazard caused by the exposure of Magnesium sulphide:
Inhalation
: May cause sneezing, coughing, difficult breathing, and irritation of the respiratory tract.
Skin
: May cause irritation, itching, and dermatitis.
Eye
: May cause burning sensation, irritation, redness and watering of the eyes if it comes in contact.
Magnesium sulphide (MgS)
• •
Conditions to Avoid
: Heat, flame and incompatible materials.
Incompatibility (Material to Avoid)
: Strong acids, strong bases, oxidizers, water/moisture.
Magnesium sulphide (MgS)
• Special precautions:
Precautions to Be Taken in Storage and Handling
: Store in tightly closed containers in a cool, dry place. Wash hands and face after use.
Other Precautions
: Handle in a controlled atmosphere.
Work Practices
: Implement engineering and work practice controls to reduce and maintain concentration of exposure at low levels. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly before eating and smoking. Do not blow dust off clothing or skin with compressed air. Maintain eyewash capable of sustained flushing, safety drench shower and facilities for washing.
Magnesium sulphide (MgS)
• Special characteristic: Aside from being a component of some slags, MgS is a rare nonterrestial mineral niningerite detected in some meteorites.
Resources:
1. Wikipedia http://en.wikipedia.org/wiki/Magnesium_sulfide 2. Webelements http://www.webelements.com/compounds/magnesium/ magnesium_sulphide.html
3. The Free Dictionary http://encyclopedia2.thefreedictionary.com/Magnesium 4. ESPI http://www.espi metals.com/msds%27s/Magnesium%20Sulfide.ht
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