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
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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
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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
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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?
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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?
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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?
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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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