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The first step in the decomposition of chemisorbed ethanol on Ni(111) has been investigated using IRAS, XPS and TPD methods. Ethanol decomposes via a first step in which O-H bond scission occurs. This reaction starts from a chemisorbed ethanol structure which is bonded to the surface through both O and H moieties with the O-H bond almost parallel to the surface. This leads to a strong deuterium kinetic isotope effect for both the ethanol decomposition step and the competitive ethanol desorption step. IRAS studies indicate that the average orientation of the (C_3v) axis of CH₃ becomes more parallel to the Ni(111) surface when chemisorbed ethanol converts to adsorbed ethoxy. Chemisorbed ethoxy possesses a structure where the C-O bond is tilted away from the surface normal, as judged by the observation of v_as(CH₂) intensity by IRAS.