Interesting, the first thought that popped in my head is that the cold water would freeze faster because it has a head start. Then I started thinking that the density of the water could make a big difference, cold water is denser than hot water... actually less water to freeze, the cubes of the hot water may be smaller. Does hot water evaporate quicker at colder temps?? Would the same weight of water instead of volume make a difference? I think an experiment is in order, god I love chemistry
Couple of things I feel I want to share, the cold water out of the tap is cleaner than the hot water. Don't know why I felt the need to share that..
If you want to make something cold fast, putting it in ice water will make it cold faster than just putting it on ice. The reason for this is that the ice transfers energy the most at its freezing/melting point. You can make a hot beer ice cold in about 10 minutes by submerging it in ice water, something that comes in handy if you're a drinker(like me). This is what I learned in college
