Video: Thaum tshav kub kub muaj peev xwm vs tshwj xeeb tshav kub yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Molar Thaum tshav kub kub muaj peev xwm yog ib qho kev ntsuas ntawm tus nqi ntawm kub yuav tsum tau nce qhov kub ntawm ib mole ntawm ib tug ntshiab tshuaj los ntawm ib tug degree K. Tshwj xeeb kub muaj peev xwm yog ib qho kev ntsuas ntawm tus nqi ntawm kub yuav tsum tau nce qhov kub ntawm ib gram ntawm ib tug ntshiab tshuaj los ntawm ib tug degree K.
Ua raws li qhov kev pom no, lub peev xwm ntawm cov cua sov thiab cov cua kub tshwj xeeb txawv li cas?
qhov kub ntawm cov khoom los ntawm 1 degree Celsius. Tshwj xeeb kub yog kub yuav tsum tau nce qhov kub ntawm ib chav tsev loj ntawm cov khoom los ntawm 1 degree Celsius. Ntawm qhov tod tes Thaum tshav kub kub muaj peev xwm nyob ntawm qhov loj ntawm cov khoom.
Ib yam li ntawd, koj txhais li cas los ntawm qhov muaj peev xwm ua kom sov? Tshwj xeeb kub muaj peev xwm yog tus nqi ntawm kub lub zog yuav tsum tau nce qhov kub ntawm cov khoom hauv ib chav tsev ntawm qhov loj. Cov tshwj xeeb kub muaj peev xwm ntawm ib yam khoom yog lub cev khoom. Nws kuj yog ib qho piv txwv ntawm cov cuab yeej uas nws kim heev vim nws tus nqi yog proportional rau qhov loj ntawm qhov system raug tshuaj xyuas.
Tib neeg kuj nug, dab tsi yog lub peev xwm ua kom sov piav qhia?
Thaum tshav kub kub muaj peev xwm , ratio ntawm kub absorbed los ntawm ib yam khoom mus rau qhov kub thiab txias hloov. Nws yog feem ntau qhia raws li calories ib degree nyob rau hauv cov nqe lus ntawm qhov tseeb npaum li cas ntawm cov khoom raug txiav txim, feem ntau yog ib tug mole (lub molecular hnyav nyob rau hauv grams). Cov Thaum tshav kub kub muaj peev xwm nyob rau hauv calories ib gram yog hu ua tshwj xeeb kub.
Dab tsi yog tus qauv rau lub peev xwm kub?
Rau xam cov peev xwm kub , siv cov qauv : Thaum tshav kub kub muaj peev xwm = E / T, qhov twg E yog tus nqi ntawm kub lub zog muab thiab T yog qhov hloov pauv ntawm qhov kub thiab txias. Piv txwv li, yog tias nws siv 2,000 Joules ntawm lub zog rau kub nce ib qho thaiv 5 degrees Celsius, lub qauv yuav zoo li: Thaum tshav kub kub muaj peev xwm = 2,000 Joules / 5 C.
Pom zoo:
Lub peev xwm tshwj xeeb ntawm octane yog dab tsi?
Octane npe Heat peev (C) 255.68 J K−1 mol−1 Std molar entropy (So298) 361.20 J K−1 mol−1 Std enthalpy ntawm tsim (ΔfH? 1 Std enthalpy ntawm combustion (ΔcH?298) −5.53–−5.33 MJ mol−1
Nws txhais li cas yog tias ib yam khoom muaj lub peev xwm kub tshwj xeeb?
Cov cua kub tshwj xeeb yog Jg−oK. Yog li, tus nqi siab txhais tau hais tias nws yuav siv ntau lub zog los tsa (lossis qis dua) nws qhov kub thiab txias. Ntxiv cov cua sov rau qhov "tseem ceeb tshwj xeeb" qhov sib xyaw ua ke yuav ua rau nws qhov kub thiab txias sai dua li ntxiv cov cua sov rau cov cua kub tshwj xeeb
Dab tsi yog qhov txawv ntawm electrostatic muaj peev xwm thiab electrostatic muaj peev xwm zog?
Tsis muaj qhov sib txawv ntawm electrostatic potentialenergy thiab hluav taws xob (al) muaj peev xwm zog. Lub peev xwm hluav taws xob ntawm ib qho taw tes yog kev ua haujlwm los ntawm lwm qhov kev quab yuam hauv kev txav chav tsev zoo los ntawm ib qho arbitrarilychosen xoom ntawm lub peev xwm (feem ntau infinity) mus rau lub ntsiab lus
Puas muaj peev xwm hluav taws xob thiab lub zog muaj peev xwm tib yam Vim li cas lossis vim li cas ho tsis?
Lub zog muaj peev xwm hluav taws xob Ue yog lub zog muaj peev xwm khaws cia thaum cov nqi tawm ntawm qhov sib npaug (xws li lub zog muaj peev xwm gravitational). Lub peev xwm hluav taws xob zoo ib yam, tab sis ib tus nqi, Ueq. Ib qho hluav taws xob muaj peev xwm sib txawv ntawm ob lub ntsiab lus hu ua voltage, V = Ue2q−Ue1q
Puas muaj peev xwm equilibrium zoo ib yam li so muaj peev xwm?
Qhov sib txawv ntawm daim nyias nyias muaj peev xwm thiab qhov muaj peev xwm sib npaug (-142 mV) sawv cev rau lub zog hluav taws xob hluav taws xob uas tsav Na + mus rau hauv lub xovtooj ntawm lub peev xwm so membrane. Thaum so, txawm li cas los xij, qhov permeability ntawm daim nyias nyias mus rau Na + tsawg heev kom tsuas yog me me Na + xau rau hauv lub cell