CHEM 1F92 Lecture Notes - Lecture 4: Intermolecular Force, Boiling Point, Triple Point

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Fcc lattice: l = 8 r = length of unit cell side. Intermolecular forces are disrupted and/or formed when a substance changes its state. Energy is put into a system t disrupt intermolecular forces. Energy is given off when intermolecular forces are formed. Sublimation, going straight from a solid to a gas, is an endothermic process (q>0) Deposition, going straight from a gas to a solid, is an exothermic process (q<0) Pressure versus temperature diagram illustrating when a substance is solid, liquid or gas. As pressure increases, the melting point also increases. As pressure decreases, the boiling point also decreases. Therefore, it can be said that pressure and melting point are directly proportional. Triple point is where all 3 phases (solid, liquid and gas) coexist. Normal boiling point, refers to the boiling point at 1 atm. **two questions relating to phase diagram on midterm!! 1 mol h2o(s) at -25 , 1 atm 1 mol h2o(g) at 125 , 1 atm.

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