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Unformatted text preview: 1st law of thermodynamics- energy is conserved, moves between system/surroundings numerical value of E can't be found, only change in E (DE) DE = Efinal - Einitial DE negative when energy lost (exothermic) DE positive when energy gained (endothermic) DE = q + w o q positive when heat moves from surroundings into system, negative when heat moves from system into surroundings o w positive when surroundings work on system, negative when system works on surroundings system - area isolated for study surroundings- everything other than the system in question closed system - can exchange energy but not matter w/ surroundings state function - property of system determined by its condition/state doesn't depend on how a change is carried out examples of state functions - E, DE not examples of state functions - work, heat...
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- Spring '08