thermochemistry

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14 Terms

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entropy

measures disorder or spontaneity of system (S)

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enthalpy

measures the heat transferred (H)

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positive S

increase in disorder/spontaneity

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negative S

decrease in disorder/spontaneity

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S, H, G = 0

equilibrium

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positive H

endothermic

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negative H

exothermic

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positive G

thermodynamically unfavorable (reaction unlikely)

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negative G

thermodynamically favorable (reaction likely)

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when is G thermodynamically favorable?

positive S, negative H

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thermochemistry

study of how heat changes in chemical reactions

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heat

total kinetic energy transferred between substances measured indirectly in J, cal, kcal

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temperature

average kinetic energy of a substance measured directly

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hess law

when going from reactants to products, the enthalpy change is the same no matter how many steps