Chap8Lec

Chap8Lec - DRAFT (Chap 8) Page 1 Chap 8 Gases, Liquids and...

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DRAFT (Chap 8) Page 1 Chap 8 – Gases, Liquids and Solids Inter molecular forces - forces that attract molecules to each other (not to be confused with the attraction of atoms to each other to form molecules) Solids Liquids Gases Equilibrium between states H 2 O at 0 o C is in equilibrium between solid (ice) and liquid (water).

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DRAFT (Chap 8) Page 2 Entropy is a measure of disorder ΔS is the change in entropy. If ΔS is POSITIVE, there is more disorder If ΔS is NEGATIVE, there is less disorder In the above example, disorder is the more probable order and, if there are no other forces to influence a “system,” it will move toward more disorder. However, often there are other forces that allow us to obtain order (such as adding or removing energy from the “system”). ΔS is NEGATIVE ΔS is POSITIVE solid→liquid liquid→gas liquid →solid gas→liquid
DRAFT (Chap 8) Page 3 “IDEAL GAS” – a valuable model (really no such thing as an ideal gas). By studying ideal gases we can learn much about how real gases behave. The idea of an ideal gas is based on the Kinetic Molecular Theory 1. The molecules * of an ideal gas are widely separated. The combined volume of the actual molecules is negligible relative to the total volume in which the gas is contained. 2. The molecules of an ideal gas move very fast in straight lines until they collide with each other or the walls of a container. 3. The molecules of an ideal gas are not attracted to each other at all. 4. The total kinetic energy (energy from movement is KINETIC ENERGY) of an ideal gas does not change unless its temperature changes . (Collisions simply transfer energy.)

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This note was uploaded on 11/29/2010 for the course CHEM 101 taught by Professor Stegemiller during the Winter '07 term at Ohio State.

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Chap8Lec - DRAFT (Chap 8) Page 1 Chap 8 Gases, Liquids and...

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