ChemActivity 5: Phase Diagrams How are the effects of temperature and pressure on phase trat Prerequisite Knowledge: 1) Describe solid, liquid and gas states at the par Predict the effect of temperature and pressure on solids, liquids and gases. Learning objective: 1.9 Interpret phase diagrams. Model 1: Phase Diagrams A phase diagram is a graphical way to represent the effects of temperature a phase of a substance. The curves indicate a set of temperatures and pressures where the phases e between the two states on opposite sides of the line. For example, Critical any point on (temperature both the solic 425 atm B, point Liquid Melting The vapor pr Freezing the critical E temperature which the ga The liquid an longer exist Solid Vaporization Condensation 1 atm supercritica the liquid an comingled. 0.010atm A, Gas Triple point Sublimation Deposition The triple p of temperatu where all thr 89 -55-32 515 Temperature C equilibrium. banove Various pres used. Recal| 1 atm = 101 Key Questions 1) What are the conditions of STP (Standard Temperature and Pressure)? and 273.15 K 1 atm 2) What is the normal boiling point of the compound? You will need to recall Pressure 5) What are the conditions of temperature and pressure for the triple point? condlitivn of Hemperature The trhiple point is the and equilibriuM: This ocurs at 1 ath 6) What are the conditions for the critical point? The critical essure where all thyelm and ist at rs Cann.ot the terriperature point is and pressure above Micu the gas be liquifed. Tus OCcurs at 425 atmo and S1S°C. 7) At a constant pressure of 0.001 atm, what phase transition(s) occur(s) as the temperature is increased from -273 to 500 °C? 8) At a constant pressure of 5 atm, what phase transition(s) occur as the temperature is increased from -273 to 500 °C.? 9) At a constant temperature of 70°C, what phase transition(s) occur(s) as the pressure in increased? 10) Examine the fusion (freezing-melting) curve. As pressure is increased, which state is favored, liquid or solid? The liquid state is favored. meonsie) 12 bhcoont ons 35W (I sr tede ila o boon Ihw uoY hnaogmon or lonino gnsd Iemon anh notesup 3en ar boe nodzoup eirt IsdW (S 1sdw (5 a P8 Sbuogmoo an inloo g lern lemon ond aJanw (6 Ismon od e JanW