Many investigators measured the forces between two hydrophobic surfaces in water, and observed long-range attractions that were stronger and longer-ranged than the van der Waals attractions. Some believe that the stronger attractions are due to structuring of water in the vicinity of hydrophobic surfaces, while others believe that they are caused by nano-bubbles or by the correlation of mobile charged patches (or domains). The latter mechanism is possible when using ionic surfactants that can physisorb and form mobile patches of self-assembled monolayers. In the present work, AFM force measurements were conducted between gold surfaces coated with chemisorbing hydrophobizing reagents such as n-alkane thiols and n-alkane xanthates. The equilibrium water contact angles of the treated surfaces were in the range of 66 and 105o. In most cases, the force vs. distance curves exhibited long-range attractions with decay lengths in the range of 16.5 and 26.0 nm. The force curves were smooth and showed no discontinuities (or steps), excluding the possibility of nano-bubbles being responsible for the long-range attractions observed in the present work. Based on the results obtained in the present work, possible origins of the long-range attractions will be discussed.