CHEM 123 Chapter Notes - Chapter 2: Acetylene, Cyanuric Chloride, Partial Charge

• School: UBC
• Department: Chemistry
• Course: CHEM 123
• Professor: Lawrence Mc Intosh

Document Summary

Chapter 2 - chemical bonding and lewis structures. Page 2. 7 (a) rationalize the relative lattice energies of lif, licl, and libr. The ionic radius of f < cl < br . Since li+ is common to all compounds, and assuming the same crystal lattice structure, dm-x in equation 2. 1 is increasing from lif to licl to libr (i. e. , the ions are further apart). Lattice energy is inversely proportional to dm-x, and thus decreases from lif to licl to libr. (b) rationalize the relative lattice energies of lif, naf, and kf. Rationalize the relative lattice energies of the two ionic compounds. For example, the lattice energy of naf is 910 kj/mol and mgo is 3795 kj/mol. One reason that the latter is significantly greater is because the ions have +2 and -2 charges instead of +1 and -1, which results in stronger net electrostatic attractions.