Cov txheej txheem:
Video: Koj yuav daws tau qhov kub ntawm cov tshuaj tiv thaiv li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2024-01-18 08:15
Enthalpy of Solution (Huab cua sov ntawm kev daws) Piv txwv
- xam tus kub tso tawm, q, hauv joules (J), los ntawm tshuaj tiv thaiv : q = mass(dej) × specification kub Peev xwm (dej) × hloov kub ( daws )
- xam cov moles ntawm solute (NaOH(s)): moles = mass ÷ molar mass.
- xam tus enthalpy change, ΔH, kJ mol-1 ntawm solute:
Ib yam li ntawd, koj pom qhov kub ntawm kev tsim ua li cas?
Qhov kev sib npaug no tseem ceeb hais tias tus qauv enthalpy hloov ntawm tsim yog sib npaug rau cov lej ntawm tus qauv enthalpies ntawm tsim ntawm cov khoom rho tawm cov lej ntawm tus qauv enthalpies ntawm tsim ntawm cov reactants. thiab tus qauv enthalpy ntawm kev tsim Tus nqi: ΔH fo[A] = 433 KJ/mol. Δ H fo[B] = -256 KJ/mol.
Tom qab ntawd, lo lus nug yog, qhov kub ntawm kev daws txhais li cas? Txhais ntawm cua sov ntawm kev daws .: cov kub evolved los yog absorbed thaum ib yam khoom dissolves tshwj xeeb: tus nqi koom nrog thaum ib tug mole los yog tej zaum ib gram dissolves nyob rau hauv ib tug loj tshaj ntawm cov kuab tshuaj.
Kuj paub, koj ua li cas xam cov kev hloov hauv tshav kub?
Thaum twg kub kev hloov pauv tau koom nrog, siv cov qauv no: hloov nyob rau hauv kub = Q / cm rau xam tus hloov nyob rau hauv kub los ntawm ib tug tshwj xeeb npaum li cas ntawm kub ntxiv. Q sawv cev rau kub ntxiv, c yog qhov tshwj xeeb kub muaj peev xwm ntawm cov khoom koj nyob nraum cua sov, thiab m yog qhov loj ntawm cov khoom koj nyob nraum cua sov.
Qhov kub ntawm combustion txhais li cas?
Kub ntawm combustion (ΔH°c) yog cov ntsuas tus nqi ntawm lub zog tso tawm nyob rau hauv daim ntawv ntawm kub (q) thaum ib tug mole ntawm ib yam khoom raug hlawv ( combustion ). Kev tsim tawm ntawm kub txhais tau hais tias cov tshuaj tiv thaiv yog txheej txheem exothermic thiab muab tawm lub zog.
Pom zoo:
Vim li cas cov tshuaj tiv thaiv kev zom zaub mov hu ua hydrolysis cov tshuaj tiv thaiv?
Thaum lub sij hawm zom mov, piv txwv li, decompositionreactions zom cov zaub mov loj rau hauv cov me me los ntawm kev ntxiv cov dej molecules. Hom tshuaj no hu ua hydrolysis. Raws li dej absorbs heatenergy, qee lub zog yog siv los rhuav tshem hydrogenbonds
Qhov nqus thiab tso tawm ntawm lub zog cuam tshuam li cas rau qhov kub thiab txias thaum lub sij hawm muaj tshuaj tiv thaiv?
Nyob rau hauv endothermic cov tshuaj tiv thaiv cov enthalpy ntawm cov khoom yog ntau dua cov enthalpy ntawm cov reactants. Vim tias cov tshuaj tiv thaiv tso tawm lossis nqus lub zog, lawv cuam tshuam rau qhov kub ntawm lawv ib puag ncig. Exothermic cov tshuaj tiv thaiv cua sov ua rau lawv ib puag ncig thaum cov tshuaj tiv thaiv endothermic txias rau lawv
Cov tshuaj tiv thaiv dab tsi yog qhov tshuaj tiv thaiv neutralization?
Neutralization yog ib hom tshuaj tiv thaiv nyob rau hauv uas muaj zog acid thiab muaj zog puag react nrog ib leeg los tsim dej thiab ntsev
Dab tsi yog tshuaj lom neeg cov tshuaj tiv thaiv thiab cov tshuaj tiv thaiv lub cev?
Qhov sib txawv ntawm cov tshuaj tiv thaiv lub cev thiab cov tshuaj tiv thaiv tshuaj yog muaj pes tsawg leeg. Hauv cov tshuaj tiv thaiv tshuaj, muaj kev hloov pauv ntawm cov tshuaj hauv nqe lus nug; nyob rau hauv ib qho kev hloov ntawm lub cev muaj qhov sib txawv ntawm qhov tsos, tsis hnov tsw, los yog cov duab yooj yim ntawm cov qauv ntawm cov teeb meem yam tsis muaj kev hloov pauv hauv cov ntsiab lus
Qhov kub thiab kub ntawm cov tshuaj tiv thaiv cuam tshuam li cas?
Thaum tshav kub kub ntawm cov tshuaj tiv thaiv, tus nqi ntawm cov cua sov uas yuav tsum tau ntxiv los yog tshem tawm thaum lub sij hawm cov tshuaj tiv thaiv nyob rau hauv thiaj li yuav khaws tag nrho cov khoom nyob rau hauv tib lub kub. Yog tias qhov kub ntawm cov tshuaj tiv thaiv yog qhov zoo, cov tshuaj tiv thaiv tau hais tias yog endothermic; yog hais tias tsis zoo, exothermic