1. What would happen if you were too rough in marking the origin line on your TLC plate, causing a break across the plate in the thin silica gel coating? 2. Why were you advised to handle the TLC plate by the edges? What problems can occur if you touch the surface of the TLC plate? 3. Suppose you mistakenly let the solvent front rise past the top of the TLC plate, but the spots were still on the plate. In desperation, you used the top of the silica plate as the solvent front when calculating your Rf values. Would these calculated Rf values be larger, smaller, or unaffected, compared to a correct calculation? Explain in detail