Chapter 5
Chapter 5 ? Gases 5.1- Pressure ~Barometer ? Measures atmospheric pressure. Invented in 1643 Units of Pressure ~Manometer ? instrument used for measuring pressure. MmHg / Torr ~ Standard atmosphere : 1 atm = 760 mmHg = 760 Torr = 101325 Pa 5.2 The Gas Laws of Boyle, Charles, and Avogadro Boyle?s Law- Pressure and volume are INVERSELY PROPORTIONAL P goes up V goes down P1V1 = P2V2 Charles Law- As T increases V increases V1/ T1 = V2/ T2 ~ K = `C + 273 ~ Pgas = Patm + Ph in an open ended manometer Gay- Lussac?s Law- P1/T1 = P2/T2 Avogadro?s Law- V1/n1 = V2/n2 Combined gas law- P1V1/n1T1 = P2V2/n2T2 Ideal Gas Laws- PV = nRT ~Kinetic Molecular Theory of Gases consant motion and perfectly elastic gas molecules do not attract or repel