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2091158604 - Examples of Selected Bond Energies...

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1 BSCI230-Lecture-6 Biomembranes and transport Chp. 4, 8 Examples of Selected Bond Energies Bond Energy = chemical energy required to break 1 mole (6x10 23 ) of bonds, expressed in calories or joules. Recall that: 1 calorie = the amount of energy required to raise 1 g of water 1 degree Centigrade (in atmosphere) • Covalent bond: 90 kcal/mole • Ionic bond: 3 " • Hydrogen bond: 1 " • van der Waals 0.1 " Approaches to Membrane Structure Studies 1. Relative impermeability to water and most large molecules 2. Separating different types of membranes 3. Chemical analysis 4. Freeze-fracture studies 5. Fluidity determinations 6. Membrane asymmetry 7. Selective permeability 8. Electrical resistance
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