When you put a glas of simple water and warm water simultaneously in a freezer, the warm water freezes early?

Question

and simple water freezes later

Answer 1

Not entirely true. The surface of the hot water freezes first, because of its lower density. But the cold water will freeze all the way through first.

Answer 2

Yes this can happen, and there is a name for it: the Mpemba effect. See http://en.wikipedia.org/wiki/Mpemba_effect

Answer 3

Did you ever try it?