# Hydrophobic sand in water [closed]

Can you please explain this experiment? Why is this happening?

## closed as off-topic by Klaus-Dieter Warzecha, Todd Minehardt, Wildcat, Jannis Andreska, getafixNov 8 '16 at 14:10

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• Have you done any research? This is supposed to be a serious chemistry site not a guess-what-reaction-this-is online multiplayer game. – M.A.R. Jan 5 '16 at 17:59
• true but i searched on internet , and didn't get anything good. . This is an academic site and most of the members are very dedicated in chemistry things. Therefore I can have a precise answer. If I had any clue over the picture, i would add that definitely. I hope you would not discourage people to learn something very interesting. I am not here to do a comedy show. :) – Numerical Person Jan 5 '16 at 18:13
• There's no reaction, it's only mixing, as you should see in the end - if there was reaction they wouldn't have starting powder in the end, also you clearly have two phases all the time – Mithoron Jan 5 '16 at 18:32
• – Todd Minehardt Nov 8 '16 at 4:04

These properties are achieved with ordinary beach sand, which contains tiny particles of pure silica, and exposing it to vapors of trimethylsilanol $\ce{(CH3)3SiOH}$, an organosilicon compound. Upon exposure, the trimethylsilane compound bonds to the silica particles while forming water. The exteriors of the sand grains are thus coated with hydrophobic groups.