Video: Thermochemical txhais li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thermochemistry yog txoj kev kawm ntawm lub tshav kub zog uas yog cuam tshuam nrog cov tshuaj tiv thaiv thiab / lossis kev hloov ntawm lub cev. Cov tshuaj tiv thaiv tuaj yeem tso tawm lossis nqus tau lub zog, thiab kev hloov pauv yuav tshwm sim ua tib yam, xws li hauv melting thiab boiling.
Ua kom pom qhov no, qhov sib npaug ntawm cov thermochemical yog dab tsi?
(−110.5 kJ) + (−283.0 kJ) = (−393.5 kJ) = ΔH of Kev tshwm sim (1) EXAMPLE OF THERMOCHEMICAL EQUATION YOG Thaum cov roj methane yog combusted, cua sov tso tawm, ua rau cov tshuaj tiv thaiv exothermic. Nyob rau hauv tus txheej txheem, 890.4 kJ raug tso tawm thiab yog li nws tau sau raws li cov khoom ntawm cov tshuaj tiv thaiv.
Tsis tas li ntawd, ΔH txhais li cas? Hloov hauv enthalpy
Ib sab saum toj no, vim li cas peb thiaj li yuav tsum kawm txog kev sib npaug ntawm cov thermochemical?
Thermochemical sib npaug suav nrog kev hloov hluav taws xob li ntawd peb tuaj yeem pom tias cov tshuaj tiv thaiv yog exothermic lossis endothermic. Tus nqi ntawm lub zog hauv ib qho chaw tuaj yeem txiav txim siab los ntawm kev kub hnyiab hauv ib lub calorimeter thiab pom tias nws tawm ntau npaum li cas.
Kuv yuav xam enthalpy li cas?
Siv cov qauv ∆H = m x s x ∆T daws. Thaum koj muaj m, qhov loj ntawm koj cov reactants, s, qhov tshwj xeeb kub ntawm koj cov khoom, thiab ∆T, qhov kub thiab txias hloov ntawm koj cov tshuaj tiv thaiv, koj tau npaj los nrhiav cov enthalpy ntawm cov tshuaj tiv thaiv. Tsuas ntsaws koj qhov tseem ceeb rau hauv qauv ∆H = m x s x ∆T thiab multiply to solve.
Pom zoo:
Koj txhais qhov hnyav txhais li cas?
Cov ntsiab lus. Weighted Mean: Ib qho txhais tau tias qee qhov txiaj ntsig pab ntau dua li lwm tus. Thaum qhov hnyav ntxiv rau 1: tsuas yog muab txhua qhov hnyav los ntawm tus nqi sib xws thiab suav tag nrho. Txwv tsis pub, muab txhua qhov hnyav w los ntawm nws qhov sib piv tus nqi x, suav tias tag nrho, thiab faib los ntawm qhov sib npaug ntawm qhov hnyav: Qhov Ntsuas Ntsuas = ΣwxΣw
Cov ntsiab lus hydrophilic thiab hydrophobic txhais li cas thiab lawv cuam tshuam li cas?
Hydrophobic txhais tau hais tias cov molecule yog "ntshai" dej. Cov tails ntawm phospholipid yog hydrophobic, txhais tau tias lawv nyob hauv daim nyias nyias. Hydrophilic txhais tau hais tias cov molecule muaj affinity rau dej
Vim li cas nws tseem ceeb kom paub tias koj txhais li cas ntxiv?
Txhais qhov seem. Kev txhais cov lus tseem ceeb yog qhov tseem ceeb thaum koj faib ua lej vim tias koj tuaj yeem tau txais qhov teeb meem tsis raug yog tias koj tsis txhais cov seem kom raug. Piv txwv li, nyob rau hauv ib lo lus teeb meem koj yuav tsum tau faib thiab faib tawm rau koj nrog ib tug seem thiab koj yuav tsum tau muab sau tseg
Koj txhais li cas los ntawm lo lus txhais?
Lub ntsiab lus txhais yog ib nqe lus ntawm lub ntsiab lus ntawm ib lo lus (ib lo lus, kab lus, lossis lwm yam cim). Cov lus txhais tau muab faib ua ob pawg loj, cov ntsiab lus tsis txaus ntseeg (uas sim muab lub ntsiab lus ntawm lub ntsiab lus) thiab cov ntsiab lus txuas ntxiv (uas sim sau cov khoom uas ib lo lus piav qhia)
Txhais tau li cas los txhais ib daim duab peb sab?
Kev txhais lus. Kev txhais lus yog ib qho kev hloov pauv uas tshwm sim thaum ib daim duab tau txav los ntawm ib qho chaw mus rau lwm qhov chaw yam tsis tau hloov nws qhov loj, duab lossis kev taw qhia. Txhawm rau txhais cov ntsiab lus P (x, y), ib chav nyob sab xis thiab b units, siv P'(x + a, y + b)