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Ch 11 Gases

Ch 11 Gases. Gases and Pressure 11.1. Pressure and Force. Pressure – (P) the force per unit area on a surface Pressure = force area P exerted by a gas depends on … Volume, ____________, and # of molecules. Force. SI unit for force is the ________ (N).

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Ch 11 Gases

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  1. Ch 11 Gases Gases and Pressure 11.1

  2. Pressure and Force • Pressure – (P) the force per unit area on a surface • Pressure = force area • P exerted by a gas depends on … • Volume, ____________, and # of molecules

  3. Force SI unit for force is the ________ (N). Newton – force that will increase the speed of a one kg mass by 1 meter per second for each second the force is applied What is the force due to gravity? How does this relate to what your ears do on an airplane?

  4. Measuring Pressure • Barometer – device used to measure atmospheric pressure • Evangelista Torricelli • 760 mm Hg

  5. Measuring Pressure • Manometer – used to measure the P of gases • Hg in one side moves based upon the pressure exerted on the Hg

  6. Units of Pressure • mm Hg – at 0 °C average atmospheric pressure is 760 mm Hg • 1 torr = mm Hg Unit named for __. • 1 atmosphere (atm) = 760 mm Hg • The SI unit for pressure is ________ • 101325 Pa = ___________ kPa • 101.325____ = 1____ = 760____

  7. Pascal • Pascal (Pa) – the pressure exerted by a force of 1 newton (1N) acting on an area of 1 square meter • Least used in science … PSI • 1 psi = 6892.86 Pa • 1 atm = 14.7 psi • STP = 1 atm & 0°C KNOW THIS

  8. Calculations • Convert 0.83 atm, the atm pressure in Denver, to mm Hg and kPa • Convert 1.75 atm to kPa and mm Hg • Convert 72.7 atm to Pa and torr.

  9. Dalton’s Law of Partial Pressure • Partial Pressure – the pressure of each gas in a mixture • Dalton’s Law of P.P. – the total P of a gas mix. is the + of the p.p. of the component gases • PT = P1 + P2 + P3 + … • Why can u calc the total P of a mix by + the p.p of each?

  10. Practice! • What is the total pressure of a container that has NH3(g) exerting a pressure of 346 torr,N2(g) exerting a pressure of 225 torr, and H2O (g) exerting a pressure of 55 torr?

  11. Practice • What would be the total pressure of a container that is holding SO2(g) with a pressure of .385 atm, SO3(g) with a pressure of 125 mm Hg, and N2O (g) with a pressure of 5.67 psi? (Answer in atm.)

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