Yog, hauv rov qab cov tshuaj tiv thaiv cov cim hloov pauv Qhov ntawd yog vim tias Enthalpy yog lub xeev muaj nuj nqi hauv lub xeev muaj nuj nqi Hauv thermodynamics, lub xeev hloov pauv yog tus hloov pauv ywj pheej ntawm lub xeev muaj nuj nqi xws li lub zog sab hauv, enthalpy, thiab entropy Piv txwv suav nrog kub, siab, thiab ntim. Thaum tshav kub kub thiab kev ua haujlwm tsis yog lub luag haujlwm hauv lub xeev, tab sis cov txheej txheem ua haujlwm. https://en.wikipedia.org › wiki › State_variable
State variable - Wikipedia
ib qho nyob ntawm tsuas yog lub xeev tam sim no ntawm kev ua haujlwm. Qhov ntawd txhais tau hais tias lub zog xav tau los thawb cov tshuaj tiv thaiv rau nws cov khoom yuav raug thim ncaj qha los thawb nws rov qab rau nws cov reactants.
Yog enthalpy thim rov qab?
Yog li ntawd, kev hloov pauv hauv enthalpy yog qhov zoo, thiab cov cua sov tau nqus los ntawm ib puag ncig los ntawm cov tshuaj tiv thaiv. Txawm hais tias qhov tshuaj tiv thaiv endothermic lossis exothermic nyob ntawm qhov kev taw qhia uas nws mus; qee cov tshuaj tiv thaiv yog thim rov qab, thiab thaum koj rov qab cov khoom rov qab rau cov reactants, qhov kev hloov pauv hauv enthalpy yog qhov sib txawv.
Dab tsi yog qhov enthalpy rau nws qhov kev rov qab los?
Cov tshuaj tiv thaiv rov qab muaj qhov negative enthalpy ntawm forward one.
Yuav ua li cas thim rov qab?
Hauv paus ntsiab lus, tag nrho cov tshuaj tiv thaiv tshuaj yog cov tshuaj tiv thaiv rov qab. Qhov no txhais tau hais tias cov khoom tuaj yeem hloov pauv rov qab mus rau qhov qub reactants.
Piv txwv ntawm cov tshuaj tiv thaiv uas mus ua kom tiav yog:
- ua tiav combustion ntawm roj.
- ntau nag los nag.
- reactions nyob rau hauv uas cov khoom khiav tawm, feem ntau yog ib tug roj.
Puas yog cov tshuaj tiv thaiv exothermic thim rov qab?
Cov tshuaj tiv thaiv rov qab yog qhov tshwm sim hauv ob qho tib si tib lub sijhawm. Yog hais tias ib qho reversible reaction yog exothermic (muab tawm lub zog) nyob rau hauv ib qho kev taw qhia nws yog endothermic (siv lub zog) nyob rau hauv lwm txoj kev. … Qhov no txhais tau hais tias qhov tshwm sim tom ntej thiab rov qab tshwm sim ntawm tus nqi tib yam.
