Cov txheej txheem:
Video: Qhov zoo H qhia li cas txog qhov kev tshwm sim?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum enthalpy yog zoo thiab delta H yog ntau tshaj xoom, qhov no txhais tau hais tias lub cev nqus cua sov. Qhov no hu ua endothermic tshuaj tiv thaiv . Thaum enthalpyis tsis zoo thiab delta H tsawg dua xoom, qhov no txhais tau hais tias lub kaw lus tso tawm cua sov. Thaum dej hloov los ntawm liquidtosolid, delta H yog tsis zoo ; dej lossesheat.
Yog li ntawd, koj paub dab tsi txog cov tshuaj tiv thaiv tshuaj yog tias tus nqi ntawm H yog qhov zoo?
A tshuaj tiv thaiv uas muaj a zoo ΔH tau hais tias yog endothermic, thaum a tshuaj tsis haum tshuaj uas muaj qhov tsis zoo ΔH yog hais tias beexothermic. Nws txhais li cas yog lub ΔH ntawm ib tug processis zoo ? Nws txhais tau hais tias lub system nyob rau hauv uas lub tshuaj tsis haum tshuaj yog tshwm sim yog gainingenergy.
Ib yam li ntawd, ib qho piv txwv ntawm cov tshuaj tiv thaiv exothermic yog dab tsi? Lwm yam yooj yim piv txwv ntawm exothermicreaction yog combustion, xws li teeb taws tswm ciab. Ib qho kev pib ntawm lub zog ua rau cov pa oxygen thiab siv quav ciab ua rau cov pa roj carbon dioxide, dej, thiab cua sov.
Cov lus nug tseem yog, koj yuav ua li cas paub yog tias enthalpy yog qhov zoo lossis tsis zoo?
Ntsiab Cai
- Yog tias ΔH tsis zoo, cov tshuaj tiv thaiv yog exothermic; Yog tias nws zoo, qhov tshuaj tiv thaiv yog endothermic.
- Thermochemical equations muaj cov qauv: A + B → C, ΔH = (± n) A + B → C, Δ H = (± n).
- Tus nqi ntawm enthalpy yog nyob ntawm cov tshuaj tiv thaiv, nrog rau cov concentration ntawm reactants thiab cov khoom.
Koj qhia li cas yog tias qhov tshuaj tiv thaiv endothermic lossis exothermic los ntawm saib nws?
Hauv kev sib npaug tshuaj, qhov chaw ntawm lo lus "kub" tuaj yeem siv tau sai txiav txim seb tus cov tshuaj tiv thaiv isendothermic los yog exothermic . Yog tshav kub isreleased raws li aproduct ntawm lub tshuaj tiv thaiv , cov tshuaj tiv thaiv yog exothermic . Yog cua sov yog teev nyob rau sab ntawmthereactants, lub cov tshuaj tiv thaiv yog endothermic.
Pom zoo:
Dab tsi tshwm sim ntawm Theodor Engelmann qhov kev sim nto moo qhia rau nws uas wavelength S yog tus tsav tsheb zoo tshaj plaws ntawm photosynthesis?
Cov kab mob sib sau ua ke ntau tshaj plaws nyob ze ntawm ib feem ntawm cov alga uas tau nthuav tawm cov xim liab thiab xiav wavelengths. Engelmann qhov kev sim ua kom pom tias lub teeb liab thiab xiav yog lub zog zoo tshaj plaws rau photosynthesis
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