It would boil and vaporize at room temperature! And it has NOTHING to do with so-called "high energy radiation from the Sun!!!"<br />
Liquid water can only exist because it requires an atmospheric pressure pushing the water molecules back together. Otherwise it only exists as a frozen or gaseous state. <br />
If you happened to open a bottle of liquid water on surface of the moon, that implies it has some heat and air pressure beforehand in order to remain liquid. <br />
In order for that heat to dissipate, the water would boil and vaporize. It would not freeze, because the only method of heat dissipation in a vacuum is radiation, which is slow compared to conduction or convection. Conduction and convection can only occur within an atmosphere or something else similar.<br />
Hope this helps -- this answer is NOT ba<x>sed on speculation, as in some of the other answers that have been posted in this thread!<br />
Actually, it would instantly boil, and then the molecules would be ripped apart due to the high energy radiation of the sun.
she beat me to it