cold water
A2. But before you close your mind, check out the Mpemba Effect in Wikipedia.
And to further improve your knowledge check out the Leidenfrost effect.
cold
hot
No hot water freezes, it has to cool off first.
cold water
If you mean, compared with cold water, it doesn't. Hot water has to cool down first, before it freezes.
Cold water freezes faster because hot water has to cool down to the freezing temperature before it can freeze.
The materials needed for the experiment are: two containers to hold the water, hot water, cold water, thermometers to measure the temperature, a freezer to freeze the water, and a timer to record the time it takes for each to freeze.
Cold air and hot water makes water freeze faster simply because the hot water is steaming and so the result is that there is less water to freeze. hot water = steam = less water less water = faster freeze cold air = faster freeze
The time it takes for hot water to freeze depends on factors such as the initial temperature of the hot water and the surrounding temperature. In general, hot water will freeze faster than cold water due to the Mpemba effect, which is the phenomenon where hot water freezes faster than cold water under certain conditions.
Kinetic energy
it Dosen't
I believe hot water freezes faster because it is supercooled. Cold water is non-supercooled. When cold water freezes ice crystals form and float to the top, forming a layer of ice over the top of the water, so the layer of ice stops evaporation . While the hot water, which is probably no longer hot in the freezer,when it does freeze, it freezes throughout, creating more or less of a slush before freezing solid.