10-3-11 - Chemistry 1A F11 10.3.11 Dr. Shaka Distributions...

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54 Chemistry 1A F11 10.3.11 Dr. Shaka Course Code 40000 Distributions • At room temperature, helium has a much higher speed than xenon. Adapted from Wikipedia
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55 Chemistry 1A F11 10.3.11 Dr. Shaka Course Code 40000 Relative Speeds • Practice Problem 6. • Compare the most probable speed for molecular oxygen and carbon tetrabromide, CBr 4 , at 100.0 °C. Ans.
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56 Chemistry 1A F11 10.3.11 Dr. Shaka Course Code 40000 Practice Problem 6 Ans.
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57 Chemistry 1A F11 10.3.11 Dr. Shaka Course Code 40000 Diffusion and Effusion • Gas molecules move at high speed, but change direction by collisions. • As a result, the net flow of one kind of gas through another is much slower than the individual molecular speeds. • This is diffusion , the random spreading out of molecules until their concentration everywhere is the same. • Diffusion in liquids is shown by a dye spreading slowly through a glass of water.
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58 Chemistry 1A F11 10.3.11 Dr. Shaka Course Code 40000 Effusion • Effusion is similar, but is the escape of a gas from container with a pinhole, into an area of lower pressure (like a vacuum).
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10-3-11 - Chemistry 1A F11 10.3.11 Dr. Shaka Distributions...

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