Puas yog cov tshuaj tiv thaiv combustion exothermic lossis endothermic?
Puas yog cov tshuaj tiv thaiv combustion exothermic lossis endothermic?

Video: Puas yog cov tshuaj tiv thaiv combustion exothermic lossis endothermic?

Video: Puas yog cov tshuaj tiv thaiv combustion exothermic lossis endothermic?
Video: Cov tshuaj tiv thaiv muaj kev nyab xeeb, siv tau, pub dawb 2024, Kaum ib hlis
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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.

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