Video: Vim li cas qhov enthalpy ntawm kev tsim ntawm cov ntsiab lus xoom?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov enthalpy ntawm kev tsim rau ib keeb nyob rau hauv nws lub xeev elemental yuav yeej ib txwm 0 vim nws yuav siv tsis tau lub zog los tsim ib tug naturally-tsim compound. Thaum ib yam khoom yog tsim los ntawm daim ntawv ruaj khov tshaj plaws ntawm nws cov ntsiab lus , kev hloov hauv enthalpy siv qhov chaw.
Ib yam li ntawd ib tug yuav nug, dab tsi tshuaj muaj ib qho enthalpy ntawm kev tsim ntawm xoom?
Tag nrho cov khoom nyob rau hauv lawv cov qauv (cov pa oxygen, khoom carbon nyob rau hauv daim ntawv ntawm graphite , thiab lwm yam) muaj tus qauv enthalpy ntawm kev tsim ntawm xoom, vim tsis muaj kev hloov pauv hauv lawv qhov tsim.
Tom qab ntawd, lo lus nug yog, dab tsi yog qhov enthalpy ntawm kev tsim cov dej? Xaiv ATcT enthalpy ntawm kev tsim raws li version 1.118 ntawm Thermochemical Network
| Hom Lub Npe | Formula | ΔfH° (298.15 K) |
|---|---|---|
| Dej | H2O (cr, eq.press.) | -292.740 |
Raws li txoj cai, vim li cas tus qauv enthalpy ntawm kev tsim ntawm pob zeb diamond tsis xoom txawm tias nws yog ib qho khoom?
Cov txheem enthalpy ntawm kev tsim rau ib keeb hauv nws txheem xeev yog ZERO !!!! Yog li, ΔH ° f rau C (s, graphite) yog xoom , tab sis ΔH ° f rau C (s, pob zeb diamond ) yog 2 kJ/mol. Tias yog vim li cas graphite yog qhov txheem lub xeev rau carbon, tsis yog pob zeb diamond.
Nws txhais li cas thaum Delta h yog xoom?
Lawv tsuas tuaj yeem ntsuas qhov hloov pauv hauv enthalpy. Thaum enthalpy yog qhov zoo thiab delta H yog ntau dua xoom , qhov no txhais tau tias tias ib qho system absorbed cua sov. Qhov no hu ua endothermic cov tshuaj tiv thaiv. Thaum enthalpy tsis zoo thiab delta H tsawg dua xoom , qhov no txhais tau tias uas ib tug system tso cua sov. Qhov no yog hu ua exothermic cov tshuaj tiv thaiv.
Pom zoo:
Dab tsi yog lub ntsiab lus ntawm kev hloov pauv lom neeg hauv cov ntsiab lus ntawm allele zaus?
Microevolution, los yog evolution ntawm ib tug me me, yog txhais raws li ib tug kev hloov nyob rau hauv lub zaus ntawm noob variants, alleles, nyob rau hauv ib tug pej xeem ntau tiam. Lub teb ntawm biology uas kawm txog allele frequencies nyob rau hauv cov pejxeem thiab yuav ua li cas lawv hloov lub sij hawm yog hu ua pej xeem noob caj noob ces
Qhov kev sib npaug twg yog qhov tsim nyog los suav cov cua sov uas tsim los ntawm HCl NaOH cov tshuaj tiv thaiv?
Xam cov naj npawb ntawm moles ntawm lub hauv paus koj ntxiv los txiav txim siab molar tshav kub ntawm qhov nruab nrab, qhia siv qhov sib npaug Δ H = Q ÷ n, qhov twg 'n' yog tus naj npawb ntawm moles. Piv txwv li, xav tias koj ntxiv 25 mL ntawm 1.0 M NaOH rau koj HCl los ua kom muaj cua sov ntawm nruab nrab ntawm 447.78 Joules
Vim li cas cov ntsiab lus thiab cov ntsiab lus yog cov tshuaj ntshiab?
Elements thiab compounds yog ob qho tib si piv txwv ntawm cov khoom ntshiab. Ib yam khoom uas tuaj yeem tawg mus rau hauv cov tshuaj lom neeg yooj yim dua (vim tias nws muaj ntau dua ib qho) yog ib qho khoom sib xyaw. Piv txwv li, dej yog acompound tsim los ntawm cov ntsiab lus hydrogen thiaboxygen
Dab tsi yog xoom xoom thiab vim li cas thiaj hu ua li ntawd?
Tsis muaj xoom yog - 273.15 degrees Celsius, -459.67 degrees Fahrenheit, thiab 0 Kelvin. Yog li hu ua vim nws yog lub ntsiab lus ntawm qhov tseem ceeb ntawm cov xwm txheej muaj qhov kev vibrational tsawg tsawg, khaws cia tsuas yog quantum mechanical, xoom-point zog-induced particle suab
Cov nqe lus twg piav qhia vim li cas lub ntsiab lus carbon tsim muaj ntau lub tebchaw?
Cov pa roj carbon monoxide yog tib lub ntsiab lus uas tuaj yeem tsim muaj ntau lub tebchaw sib txawv vim tias txhua cov pa roj carbon atom tuaj yeem tsim plaub daim ntawv cog lus tshuaj rau lwm cov atoms, thiab vim tias cov pa roj carbon atom tsuas yog txoj cai, me me kom haum rau hauv qhov chaw ntawm cov molecules loj heev