Lewis Acids and Bases

Lewis acid

electron pair acceptor

Lewis base

electron pair donor

Lewis acid-base reaction

the formation of a bond between an electron-pair donor and an electron-pair acceptor

Structural features of a Lewis acid

Must have an orbital that can accept electrons

partially positive or positive charge

Structural features of a Lewis base

Must have lone pair of electrons

curved arrow

show how electrons move in reactions

Curved arrows start at ___________ and point toward_____________

Curved arrows start at the lone pair of the base and point toward the acid

transition metals tend to be Lewis ___________

acids

BF3 is a Lewis __________

acid

NH3 is a Lewis ____________

base

Alkanes are Lewis ____________

neither acid or base

there is no lone pair or empty orbital