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Announcements To join clicker to class today: – Turn on the Clicker (the red LED comes on). – Push “Join” button followed by “20” followed by the “Send” button (switches to flashing green LED if successful). ● Exam 4 scores available on D2L. ● Bring possible errors to Dr. Gutow's attention as soon as possible. ● Wear appropriate clothes to Lab!

Review attractive interactions among molecules: –ion-ion (lattice energy: U=k(Q 1 Q 2 /d), calculation of U from a cycle of reactions ) –ion-dipole –dipole-dipole –dipole - induced dipole –Dispersion

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Solvation of Ions fig 9.5