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Questions and Answers
What is the primary structure of silicones?
A linear, repeating silicon-oxygen (Si―O) polar backbone with organic groups attached.
Silicone polymers include carbon as part of the backbone structure.
False
What are organosilicon compounds?
Organometallic compounds containing carbon-silicon bonds.
What are the unique properties of silicones?
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What industries use silicones?
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The bond energy of Si-O is much larger than the bond energy of C-C, giving silicones _____ stability.
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Study Notes
Organosilicon Compounds
- Organosilicon compounds are organometallic compounds that contain carbon-silicon bonds.
- Organosilicon chemistry is the study of their preparation and properties.
- Most organosilicon compounds have similar properties to organic compounds, including being colorless, flammable, hydrophobic, and stable in air.
Nomenclature
- Silicon is represented by the symbol "Si".
- Silica is a compound with the formula SiO2.
- Silanes are compounds with the general formula of XnSiH4-n, where X is a halide, such as chlorine.
- Siloxanes are compounds with the general formula [R2SiO]n , where R is an alkyl or phenyl group, such as CH3 or C6H5.
Silicones or Polyorganosiloxanes
- Silicones are synthetic inorganic polymers that consist of a repeating silicon-oxygen (Si―O) backbone chain with organic groups attached to the silicon atoms by C-Si bonds.
- The structure of a silicone polymer has a linear, repeating silicon-oxygen backbone with organic groups (R) attached to the silicon atoms.
- The Si-O bond is very ionic and more stable than the C-C bond, giving silicone polymers thermal stability.
- The number of repeat units (n) and degree of cross-linking determine the properties and applications of these polymers.
Properties
- Silicones possess unique properties due to the combination of organic groups attached to inorganic atoms.
- They are used in various industries, including electronics, paints, construction, and food.
- Silicones are stable at high temperatures and resistant to oxidation and weathering.
- They are water-repellent due to their hydrophobic nature.
- Silicones are flexible polymers with adhesive properties.
- They are also electrically non-conducting.
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Description
This quiz focuses on the chemistry of organosilicon compounds, including their properties, nomenclature, and structures such as silanes and silicones. Delve into the fascinating world of organosilicon chemistry to test your understanding of these unique compounds.
