Chem 125 - 5 - Chapter 5

Chem 125 5- - Gases Air Pressure When the weather is nice what is the barometric pressure 30.0 Hg = 762 mm Hg Pressure Units Torricelli's Barometer

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Gases!

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Air Pressure When the weather is nice, what is the barometric pressure? 30.0˝ Hg = 762 mm Hg
Pressure Units

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Torricelli’s Barometer Does Torricelli’s discovery have implications for using a well for water? Evangelista Torricelli – 1643 2
Gas Pressure The pressure of any gas can be measured using the principle behind the Torricelli Barometer

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The Empirical Gas Laws Boyle’s Law – Robert Boyle 1661 Charles’ Law – Jacques Charles 1787 Combined Gas Law – Boyle’s + Charles’ Laws Avogadro’s Law – Amedeo Avogadro 1811 Ideal Gas Law – Boyle’s + Charles’ + Avogadro’s Laws
Boyle’s Law Note: Amount of gas (n) and T are constant. Pressure and volume are inversely related for a gas. What would a volume vs. pressure plot look like look like? PV constant =

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Boyle’s Law How could you measure the constant (k) in Boyle’s Law?
Boyle’s Law Given: Plot: What is k? 1 vs. P V PV = k

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Boyle’s Law in Action What change in P has occurred and why upon going from A to B? How would you calculate the change in P?
Charles’ Law V constant T = Note: Amount of gas (n) and P are constant. Pressure and volume are linearly related for a gas. What would a volume vs. pressure plot look like look like?

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Charles’ Law How could we determine the Charles’ Law constant (k') from this plot?
Absolute Temperature For calculations involving gases, the absolute, or Kelvin (K), temperature scale is used. T(in K) T(in C) + 273.15 = o

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Balloon of gas at room temp. Balloon of gas at a cold temp. What is the pressure of the gas in the two cases?
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This note was uploaded on 04/09/2008 for the course CHEM 125 taught by Professor Bussell during the Fall '06 term at Western Washington.

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Chem 125 5- - Gases Air Pressure When the weather is nice what is the barometric pressure 30.0 Hg = 762 mm Hg Pressure Units Torricelli's Barometer

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