Dipole Moment Amount of electrical charge x bond length. Charge separation shown by electrostatic potential map(EPM). Red indicates a partially negative region and blue indicates a partially positive region. HC-CH => Chapter 1 10 Chapter 1 10 Dipole Moment • Amount of electrical charge x bond length. • Charge separation shown by electrostatic potential map (EPM). • Red indicates a partially negative region and blue indicates a partially positive region. C C H H H H =>