-Diffusion -Graham’s Law of Effusion -Dalton’s Law of Partial Pressures Chemistry Mrs. Coyle.

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Presentation transcript:

-Diffusion -Graham’s Law of Effusion -Dalton’s Law of Partial Pressures Chemistry Mrs. Coyle

Diffusion

Diffusion The process in which particles of matter move from areas of high concentration to areas of low concentration.

Effusion The passage of gases through a small hole or pores of a membrane.

Note Gases of lower molar mass diffuse and effuse faster than gases of higher molar mass.

Graham’s Law of Effusion ________ va= √ (MMb ) vb MMa v = rate of effusion MM= molar mass -The rate of effusion of a gas is inversely proportional to the square root of its molar mass.

Example Compare the rates of effusion of CO2 to oxygen gas.

Dalton’s Law of Partial Pressures http://cwx.prenhall.com/bookbind/pubbooks/hillchem3/medialib/media_portfolio/text_images/CH05/FG05_14.JPG

Dalton’s Law of Partial Pressures: The total pressure in a gas mixture is the sum of the partial pressures of each individual gas. Ptotal = Pgas 1 + Pgas 2 + Pgas 3 + …

Partial Pressure of a Gas: The pressure that the gas would exert if it were the only gas present in the container.