Isodesmic Equations
Question 1
For the following reactions, would you expect the product to be more or less thermodynamically stable than the reactants, based on average bond energies:
 SbCl_{3} + F_{2} → SbF_{3} + Cl_{2} [Solution]
 P(CH_{3})_{3} + S_{8} → S=P(CH_{3})_{3} [Solution]
 H_{2}CO_{3} → CO_{2} + H_{2}O [Solution]
Question 2
For the following reactions, which product would be expected to form (or neither):
 P_{4} + Cl_{2} → PCl_{3} or PCl_{5} ? [Solution]
 HCCH + Br_{2} → HBrCCBrH or HBr_{2}CCBr_{2}H ? [Solution]
 CN^{} + O_{2} → OCN^{} or CNO^{} (linear) ? [Solution]
CGMT Theory
Question 1
Would the following Compounds be expected to have planar or transbent geometries?
 H_{2}CCH_{2} [Solution]
 H_{2}SiSiH_{2} [Solution]
 H_{2}CSiH_{2} [Solution]
Fragment  SingletTriplet Gap (kJ mol^{1}) 
CH_{2}  38 
SiH_{2}  88 


Bond  Bond Energy (kJ mol^{1}) 
CC(σ)  346 
SiSi(σ)  222 
CSi(σ)  300 
CC(π)  295 
SiSi(π)  120 
CSi(π)  139 (est.) 

