12. Some theories of aging suggest that free radicals cause certain diseases and perhaps aging in general. Free radicals

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12 Some Theories Of Aging Suggest That Free Radicals Cause Certain Diseases And Perhaps Aging In General Free Radicals 1 (141.6 KiB) Viewed 58 times

12. Some theories of aging suggest that free radicals cause certain diseases and perhaps aging in general. Free radicals are chemical species with an odd number of valence electrons. Draw Lewis structures for each of the following free radicals listed below: A. O, B.O СОН D. CH3COO (unpaired electron on terminal 13. The Born-Haber cycle is a proper application of Hess' Law. This cycle is usually applied to ionic compounds to find the crystal lattice energy. However, it can also be applied to covalent compounds. When it is applied to covalent compounds, it can be used to find the “Energy of Forming Covalent Bonds from Ions". This is a new term that you've never heard before because I made it up (May 7, 2017). So, the AH value for this reaction is what we are trying to determine: 2 H*(g) + O2(g) → H2O(g) AH Energy of Farming Covalent Bonds from lons = AHEFCBA = ? To help you do this, I've layed out the basic structure below. Please fill in each shaded box correctly and solve for AHEFCBA (box K). Reaction AH value (kJ/mol) / Name of Reaction Bond Dissociation Energy of H A. (+1) B. (+1) C. (+1) H(g) → H(g) + c D. (+6) E. (+1) Bond Dissociation Energy of O2 F. (+1) G. (+1) H. (+1) O(g) + O (g) -141 I. (+1) ) O(g) + -> 02-(g) 770 2 H*(g) + O2(g) → H2O(g) J. (+1) Energy of Forming Covalent Bonds from Ions Standard Enthalpy of formation of H.O(g) K. (+6) H2(g) + O2(g) → + → H2O(g) -241.8 Hints: 1. The points for filling in each box correctly are given in each shaded box. The easier boxes are worth one point. The harder boxes are worth 6 points. 6 . 2. If you don't know any of the boxes, please feel free to make assumptions so that you can work out other parts of the problem. In particular, if you don't know box D, assume that it is 150 kJ/mol. This number is incorrect, but allows you to continue the problem. 8