An unresolved question! See Mpemba Effect in wikipedia for the best experimental conditions for this anomaly!
It has been proven that hot water freezes faster than cold water.
yes
Yes it does. Cold water freeze slower than normal or hot water.
Hot and cold water and a freezer and a timer or stopwatch
No. It takes longer to freeze because cold water is closer to it's freezing point.
The fact that hot water may freeze faster than cold is often called the Mpemba effect
Water will freeze faster than salt water.
Yes. Water of any starting temperature must be cooled to 0 oC in order to freeze.
no salt water does not freeze faster than sugar.
no because the cold water speeds up the process by starting it
Cold water will freeze faster. Because the freezing point of water is 0oC, water that is closer to that point will freeze faster then hot water. This is because it will require less time to lower the temperature to the freezing point.
I suppose that pure water freeze faster.