Chemistry 123

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Chemistry 123

• Week of 4 February 2008

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Network Covalent Solids
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Application

• Rank the following in order of increasing melting
  point, with 1 being the lowest melting point and
  5 being the highest.
•   KCl
•   Kr
•   Na2O
•   SF2
•   Cl2

Kr lt Cl2 lt SF2 lt KCl lt Na2O
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What type of substance?

• A particular substance
• melts at 1910C
• boils at 3407C
• conducts electricity as a solid and a liquid
• is not soluble in water
• Is the substance
• metallic
• atomic/molecular
• ionic
• network covalent

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Application

• You are asked to make a solution of CaCl2. 
• Will water or benzene result in the more
  concentrated solution, and why?

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Think about it

• Benzene and water are miscible as gases but as
  liquids they are only slightly soluble in each
  other. 

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Vitamins and IM forces
Vitamin B6
Vitamin E
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Other nutrients
lycopene
lysine
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Amino acids polypeptide chain
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Collagen
Sequence (primary structure) (G-X-Y)n G
glycine X usually proline Y usually
hydroxyproline
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Attractive forces in proteins
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Fatty acid chains in soap micelle
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phospholipid
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Cell membrane with embedded proteins
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Antibiotics and IM forces
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DNA and IM forces
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Exo- and endothermic solution processes
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Lattice energies
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DHsoln, DHhydr, and DHlattice
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Enthalpy of solution
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Equilibrium and the solution process
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Supersaturation
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Solubility and temperature