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Gay-Lussac’s Law (and a few loose ends) Pressure vs Temperature

Gay-Lussac’s Law (and a few loose ends) Pressure vs Temperature. Gay-Lussac (1778-1850). balloonist 1802: climbed to 23,000 feet record stood for 50 years i nvestigated composition of atmosphere as function of altitude. Gay-Lussac.

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Gay-Lussac’s Law (and a few loose ends) Pressure vs Temperature

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  1. Gay-Lussac’s Law (and a few loose ends) Pressure vs Temperature

  2. Gay-Lussac (1778-1850) • balloonist • 1802: climbed to 23,000 feet record stood for 50 years • investigated composition of atmosphere as function of altitude

  3. Gay-Lussac • examined relationship between P & T at constant V and # moles • as T : • gas molecules move faster, collide with walls more frequently & more energetically • pressure results from collisions between gas molecules & walls of container • so, if T , expect P

  4. Which temperature scale has a direct relationship to molecular velocity? Kelvin

  5. Typical data from a Gay-Lussac type experiment What kind of relationship is illustrated in this graph?

  6. When temperature decreases, the pressure of a gas _____________ (decreases, increases, stays the same) • When temperature increases, the pressure of a gas ___________ (decreases, increases, stays the same) decreases increases

  7. Gay-Lussac’s Law • relationship between P & T at constant volume & # moles • P = kT or P/T = k

  8. Gay-Lussac’s Law: verbally • pressure exerted by confined gas is directly related to Kelvin temperature at constant volume & # moles

  9. Gay-Lussac’s Law: mathematically P1 = P2 T1 T2 OR P1T2 = T1P2

  10. Gay-Lussac’s Law: graph P vs T of a gas (K) what kind of relationship is this? direct graph: straight line with y-intercept of zero

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