Video: Puas yog cov tshuaj tiv thaiv combustion exothermic lossis endothermic?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
combustion yog oxidation tshuaj tiv thaiv uas ua kom sov, thiab nws yog li ntawd ib txwm exothermic . Txhua yam tshuaj cov tshuaj tiv thaiv thawj zaug tawg daim ntawv cog lus thiab tom qab ntawd ua cov tshiab los tsim cov khoom tshiab. Kev rhuav tshem cov ntawv cog lus siv lub zog thaum ua cov ntawv cog lus tshiab tso tawm lub zog.
Yog li ntawd, puas yog combustion yog endothermic lossis exothermic txheej txheem?
combustion Cov tshuaj tiv thaiv ib txwm muaj molecular oxygen O2. Txhua lub sij hawm txhua yam kub hnyiab (hauv qhov kev xav ib txwm muaj), nws yog combustion tshuaj tiv thaiv . combustion cov tshuaj tiv thaiv yuav luag ib txwm exothermic (piv txwv li, lawv muab cua sov). Thaum cov organic molecules combust lub tshuaj tiv thaiv cov khoom yog carbon dioxide thiab dej (nrog rau cua sov).
Tsis tas li ntawd, puas yog combustion ntawm hydrogen endothermic los yog exothermic? Vim muaj ob tug moles hydrogen nyob rau hauv cov kab zauv saum toj no lub zog yuav tsum tau halved thiab vim nws yog ib tug exothermic tshuaj tiv thaiv daim duab yuav tsis zoo. Li no lub enthalpy ntawm combustion rau hydrogen yog -286 kJ mol-1.
Ntxiv mus, yog cov tshuaj tiv thaiv combustion nyob rau hauv lub tsheb cav endothermic los yog exothermic?
Hos ntau cov tshuaj tiv thaiv yog endothermic cov tshuaj cov tshuaj tiv thaiv uas sov peb, np. qhov kub ( combustion ) ntawm fuels thiab cov combustion petrol ib tsheb cav yog ob qho tseem ceeb exothermic tshuaj tiv thaiv.
Ib qho piv txwv ntawm endothermic yog dab tsi?
Cov no piv txwv tuaj yeem sau ua tshuaj lom neeg, tab sis feem ntau suav tias yog endothermic los yog cov txheej txheem kub-absorbing: Melting ice cubes. Melting khoom ntsev. Evaporating kua dej. Hloov Frost rau dej vapor (melting, boiling, thiab evaporation, feem ntau, yog endothermic txheej txheem.
Pom zoo:
Puas yog cov tshuaj tiv thaiv tom ntej endothermic lossis exothermic?
Cov tshuaj tiv thaiv pem hauv ntej muaj ΔH>0. Qhov no txhais tau tias cov tshuaj tiv thaiv pem hauv ntej yog endothermic. Yog li ntawd, cov tshuaj tiv thaiv yuav tsum tau beexothermic
Puas yog lub zog tso tawm lossis absorbed hauv cov tshuaj tiv thaiv exothermic?
Ib qho tshuaj tiv thaiv uas lub zog tawm mus rau ib puag ncig yog hu ua cov tshuaj tiv thaiv exothermic. Nyob rau hauv hom tshuaj tiv thaiv no lub enthalpy, los yog khaws cia chemical zog, yog qis dua rau cov khoom tshaj cov reactants. Thaum ammonium nitrate yaj nyob rau hauv dej, lub zog yog absorbed thiab dej txias
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
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