(10-11) F3 Chemistry Individual Project Work Ionic & Covalent compounds

(10-11) F3 Chemistry Individual Project Work

Ionic & Covalent compounds

Compound: Magnesium sulphide (MgS)

Shirley Kam (9)F.3A

Magnesium sulphide

• Formula: MgS• Electron diagram:

Magnesium sulphide (MgS)

• Melting point: >2000 °C• 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

• Boiling point:

No data

Physical properties:

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 produc

ed 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 decompositi

on, 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. W

ash hands and face after use.

Other Precautions: Handle in a controlled atmosphere. Work Practices: Implement engineering and work practice controls to red

uce 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. Wikipediahttp://en.wikipedia.org/wiki/Magnesium_sulfide2. Webelementshttp://www.webelements.com/compounds/magnesium/magnesium_sulphide.html3. The Free Dictionaryhttp://encyclopedia2.thefreedictionary.com/Magnesium4. ESPIhttp://www.espi-

metals.com/msds%27s/Magnesium%20Sulfide.htm

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