CHM 2045 Lecture Notes - Gas Constant, Reaction Rate Constant, Collision Frequency
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Speeds at stp are hundreds of meters per second, e. g. oxygen = 481 m/s: a. One mole of any ideally behaving as will occupy 22. 4 liters at stp: a. Distance traveled by a gas molecule between collisions: b. About 1/10,000 of a millimeter: c. billions of collisions per second, a. Unlike liquid, regardless of polarity differences, two different gaseous substances will: b. At lower temperatures, gravity will cause the heavier molecules to settle below the form a homogenous mixture: mixtures lighter molecules. Because the pressure decreases by two as the volume doubles by two. Pressure is related to k. e. , so if k. e. also decreased by two, pressure would decrease by more than a factor of two. Thus temperature decreases to maintain equality in pv = nrt. Ideal gases: special cases of the ideal gas law. P1v1 /t1 = p2v2 / t2 (constant n) Ideal gases: partial pressure the mole fraction of the particular gas: a.