Help [Assign Chem]

[zmxn]

Hello po ulit, parang ako nalang yata suki ng chem dito hahshsaha pero papatulong po ulit sa mga questions:
1. How does a snow turns from solid to a gas? Is it a sublimation process?
2. What does Rf value mean in chromatography? Give its formula.

Kahit po simple insights lang advance thank you po.