CHEM104 Lecture Notes - Lecture 3: Bond-Dissociation Energy, Cathode Ray, Bond Order

• School: University of Delaware
• Department: Chemistry and Biochemistry
• Course: CHEM104
• Professor: Wingrave James

Document Summary

Molecular and electronic structure: electronic structure shows electrons and atoms, molecular structure shows only atoms but lp electrons on central atom still do influence molecular structure. They can look similar due to structure but aren"t the same. Polarity of a molecule: polarity results from unequal pull of exterior atoms on the central atom, the pull of the exterior atoms on central atom is the vector. Sum of all the bond dipoles (electronegaivity diference) Dipole-a pair of equal and oppositely charged or magneized poles separates by a distance. Nonpolar when charges are the same (only when they are same element) If the pull is balanced, then the molecule is nonpolar. If the pull is unbalanced, then the molecule is polar. Unbalanced pull of exterior atoms on the central atom results from. Lp electrons which don"t compensate the opposing bond dipoles. Diferent exterior atoms which form diferent strength bond dipoles (diferent electronegaivity diferences) Bond center atom to orbiing atoms (least electronegaive)