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11-30-07%20-%20Lecture%2019%20-%20Chapter%204

# 11-30-07%20-%20Lecture%2019%20-%20Chapter%204 - The...

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The Properties of Gases Chapter 4

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Why are gases important? Airbags fill with N 2 gas in an accident. Gas is generated by the decomposition of sodium azide, NaN3. 2 NaN 3 (s) → 2 Na(s) + 3 N 2 (g) *We breathe gases everyday that we are dependent upon to sustain life*
Three states of matter -molecules rigid, don’t move very much -holds shape -molecules less rigid, move around -does not hold shape, but volume stays constant -molecules move around constantly -does not hold shape or volume

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Properties of Gases Properties of Gases Gas properties can be measured and related mathematically. Gas characteristics: V = volume of the gas (L, m3) T = temperature (K) n = amount (mols) P = pressure (atm, bar, Pa, mm Hg) For given n, then any of V, P, or T can be changed by altering one of the other two.
Atmospheric Pressure Atmospheric pressure is measured with a BAROMETER (developed by Torricelli in Italy in 1643) -height of column of Hg is directly proportional to the atmospheric pressure

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Manometer
Units of Pressure

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