HWaterHHimf 3. Given the heating-cooling curve grapht to the right, a) Circle the pontion of the cooling curve for Unkown 12 where a phase changn occurs. b) Explain why that portion of the graph appears the way it does. c) Which unknown should have weaker intermolecular forces? J d) Which unknown should exhibit lower vapor pressure? Justify your answer in terms of relative strength of intermolecular forces