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# Gas Diffusion

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### Gas Diffusion

1. 1. Gas Behavior and Chemical Formulas <ul><li>Objectives </li></ul><ul><ul><li>discuss how Graham’s law of diffusion describes how quickly an odor will fill a room </li></ul></ul><ul><ul><li>explain Dalton’s law of partial pressures </li></ul></ul><ul><ul><li>describe the relationships between gas behavior and chemical formulas in terms of Graham’s law of diffusion and Dalton’s law of partial pressures </li></ul></ul>
2. 2. Question of the day: <ul><li>What will you smell from across the room faster – raw garlic or ammonia? </li></ul>
3. 3. Diffusion <ul><li>Diffusion : the movement of particles from regions of high density to regions of low density </li></ul><ul><li>The diffusion of a gas occurs until the gas is evenly dispersed throughout its container – at this point, the mixture of the gas is homogenous </li></ul>
4. 4. Effusion <ul><li>Effusion – the passage of a gas under pressure through a tiny opening </li></ul>
5. 5. How Diffusion and Effusion are Similar <ul><li>At a constant temperature and pressure, the rate of effusion or diffusion of a gas is inversely proportional to the square root of the gas’s density </li></ul><ul><li>In other words, a particular gas will effuse and diffuse at the same rate, given constant temperature and pressure </li></ul>
6. 6. Graham’s Law of Diffusion <ul><li>The relationship between molar mass and diffusion/effusion rate is described mathematically using Graham’s Law of Diffusion </li></ul>
7. 7. Graham’s Law of Diffusion <ul><li>Remember that an inverse relationship means that as one measurement increases, another decreases </li></ul><ul><li>So, in the case of Graham’s Law, as the square root of the density of gas increases , the rate of diffusion decreases </li></ul>
8. 8. Question of the day: <ul><li>What will you smell from across the room faster – raw garlic or ammonia? </li></ul><ul><li>What do you need to know about raw garlic and ammonia to answer this question? </li></ul>
9. 9. Garlic v Ammonia <ul><li>the odor in garlic comes from a compound named diallyl disulfide – it’s chemical formula is C 6 H 10 S 2 </li></ul><ul><li>the formula for ammonia is NH 3 </li></ul>
10. 10. Practice Problems <ul><li>pg 438 # 1 - 4 </li></ul>