Phases - Key property of a physical change(i.e melting...

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Key property of a physical change (i.e. melting, boiling, freezing): - Affects only the intermolecular forces between molecules or atoms - Disrupts the attractive interactions between the molecules. Temperature – a measure of the amount of internal kinetic energy (energy of motion) that molecules have. The average KE of molecules directly affects its phase, or state (i.e. whether it’s a solid, liquid or gas) Higher KE higher entropy Phase changes are resultant of breaking or forming intermolecular attractions (remember, not intramolecular ones ) In solid phase, molecules are at relatively fixed positions (i.e. they do not want to move, unless there are increases in temperature or pressure) - Solids are most ordered, and least energetic - Liquids are a bit less ordered and more energetic (these molecules have a higher average KE) - Gases are the least ordered (most entropy), and most energetic Vaporization = boiling Understand the following terms: boiling, condensation, sublimation (solid gas), deposition (gas liquid), freezing (crystallization), and fusion (melting) - Know when heat is put in, when heat is given off, when internal KE decreases/increases, and when entropy increases/decreases. Notice: Internal KE α Entropy
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This note was uploaded on 11/07/2010 for the course CBN 356 taught by Professor Merill during the Spring '08 term at Rutgers.

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Phases - Key property of a physical change(i.e melting...

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