240_l01 - Copy - Properties of Gases Chapter 1 of Physical...

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Properties of Gases Chapter 1 of “Physical Chemistry - 6th Edition” P.W. Atkins. Chapter 1 and a little bit of Chapter 24 of 7th Edition. Chapter 1 and a little bit of Chapter 21 of 8th edition. The perfect gas States of gases Gas laws Kinetic model of gases (Ch 24.1 7th ed, 21.1 8th ed.) Real gases Molecular interactions van der Waals equation Principle of corresponding states Last updated: Sept. 11, 2006, modified slide 1.
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Phases of Matter * Three basic phases of matter: Gas : Fills a container, taking on the shape of the container. Similar to a liquid, except that particles are very widely spaced from one another, and interparticle interactions are minimal. Liquid : Does not fill a container, but takes on the shape of the container. Similar to gases, except particles very closely spaced. Solid : Does not fill a container, and do not conform to the shape of the container. Particles are very closely packed - still much dynamic motion in a solid, which increases with heating.
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Perfect Gases * We shall consider a hypothetical perfect or ideal gas, which is a form of matter that completely fills any container. A perfect gas is pictured as a collection of molecules or atoms which undergo continuous random motion (or Brownian motion): - The speeds of the particles increase as the temperature is increased - The molecules are widely separated from one another, with the only interactions being with the side of the container
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240_l01 - Copy - Properties of Gases Chapter 1 of Physical...

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