Hi, could you please help me answer this chemistry questions?

Hi, could you please help me answer this chemistry questions?
1.) The lab manual instructs you to heat camphor at position 2 on the hot plate, which is a moderately low setting. What would be a problem of heating the camphor too quickly?
2.) A mixture of ammonium chloride, sand, and salt will be separated and their masses determined. Briefly explain how each of the three components will be isolated from the mixture
Thank you