BCHS%203304%201A.%20Thermodynamics%20I

BCHS%203304%201A.%20Thermodynamics%20I - Thermodynamics...

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Thermodynamics: Allows a prediction as to the spontaneous nature of a chemical reaction: Will this reaction proceed in a forward direction as the reaction is written: A B Will A react to form B or not? Is this reaction going from higher to lower energy? ENERGY not necessarily just heat!!!
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Definitions: System : a defined part of the universe a chemical reaction a bacteria a metabolic pathway Surroundings : the rest of the universe Open system : allows exchange of energy and matter Closed system : no exchange of matter or energy. Perfect insulated box .
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First Law: Energy is neither created or destroyed. In a chemical reaction, all the energy must be accounted for. Equivalence of work w and energy (heat) q Direction of heat flow by definition is most important . q = heat absorbed by the system from surroundings If q has a negative value, -q, the system gives off heat. (exothermic) A negative W is work done by the system on the
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U = U final - U initial = q - w Exothermic system releases heat = -q Endothermic system gains heat = +q U = a state function dependent on the current properties only. U is path independent while q and w are not state functions because they can be converted from one form of energy to the other. Of course we are excluding electrical, light and nuclear energy from this discussion . Path: is a process by which energy changes in a system .
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I have $100 in my bank account, I withdrew $50, now I have $50. I could have added $100 and withdrew $150.
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