Kev sib xyaw ua lej ntawm kev hloov pauv enthalpy thiab hloov pauv hloov pauv tso cai rau kev hloov pauv ntawm lub zog dawb los suav. A tawm tsam nrog tus nqi tsis zoo rau ΔG tso tawm lub zog dawb thiab yog li nws tus kheej. Cov tshuaj tiv thaiv nrog qhov zoo ΔG yog tsis ua raws li kev xav thiab yuav tsis nyiam cov khoom.
Yuav ua li cas koj thiaj paub yog tias qhov tshwm sim tshwm sim los yog tsis ua raws li txoj cai?
1: Combustion reactions, xws li qhov hluav taws kub no, yog qhov tshwm sim tshwm sim. Thaum cov tshuaj tiv thaiv pib, nws tseem nyob ntawm nws tus kheej kom txog thaum ib qho ntawm cov reactants (roj los yog oxygen) ploj mus. Cov tshuaj tiv thaiv tsis raws cai yog cov tshuaj tiv thaiv uas tsis nyiam tsim cov khoom ntawm cov txheej txheem muab.
Yuav ua li cas koj thiaj paub tias nws yog qhov tshwm sim tshwm sim?
Ib yam tshwm sim tshwm sim yog ib qho kev tshwm sim uas tshwm sim hauv cov xwm txheej uas tsis muaj kev cuam tshuam. Kev tshwm sim tshwm sim yog nrog los ntawm kev nce hauv tag nrho entropy, lossis tsis meej. … Yog hais tias Gibbs Dawb Zog yog qhov tsis zoo, ces qhov tshwm sim yog tshwm sim, thiab yog tias nws yog qhov zoo, ces nws tsis tshwm sim.
Yuav ua li cas piv txwv ntawm kev tshwm sim tshwm sim?
Feem ntau cov tshuaj tiv thaiv tus kheej yog exothermic - lawv tso cua sov thiab sov so rau lawv ib puag ncig: piv txwv li: hlawv ntoo, foob pob hluav taws, thiab alkali hlau ntxiv rau dej. Thaum lub atom hluav taws xob sib cais, nws tso tawm lub zog: qhov no yog qhov tshwm sim ntawm qhov tshwm sim, exothermic nuclear tshuaj tiv thaiv.
Yog qhov thim rov qab ntawm aCov tshuaj tiv thaiv tus kheej Nonspontaneous?
Ib txheej txheem uas tshwm sim hauv ib qho kev coj ua raws li cov txheej txheem tshwj xeeb yog tsis ua raws li kev coj rov qab. Piv txwv li, nyob rau hauv chav tsev kub thiab ib txwm atmospheric siab, piv txwv li, dej khov yuav spontaneously yaj, tab sis dej yuav tsis spontaneously khov.
