yes
Sugar.
Salt and sugar do not evaporate, but the water that they are dissolved in does.
yes
Salt melts ice faster than sugar or pepper. Salt lowers the freezing point of water, causing it to turn into liquid water at a lower temperature than normal. Pepper and sugar do not have the same effect on ice as salt does.
sugar as it is soluble and has a definite heat of fusion.
Allways pure water evaporate faster.
Add the mixture into water and stir to dissolve the sugar. Pour the watery mixture into another container, using a paper filter to catch the pepper. If you would like to have the sugar back into solid form, simply evaporate the water.
pepper actually floats only some goes to the bottom in a water solution so after that you would need to filter the pepper and sawdust because it is larger and then evaporate the water.
if youre referring to ground pepper, then sugar would disolve faster as it is more dense. whereas, pepper corns wouldn't disolve, perhaps over a very long period of time ie, months, but basically sugar would disolve faster.
pepper actually floats only some goes to the bottom in a water solution so after that you would need to filter the pepper and sawdust because it is larger and then evaporate the water.
You need to determine what you think will melt the fastest, and that will be your hypothesis. If you think that pepper will melt it faster, you would say "My hypothesis is that the pepper will melt ice faster than the other variables (sand, salt, and sugar)."
Probably slower, since it has less concentration of water.