Video: Cov tshuaj twg yog siv rau hauv cov khoom kub thiab txias?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Instant Kub thiab Cold Packs
Raws li cov ntsev disassociates, tshav kub yog tso tawm nyob rau hauv ib tug exothermic cov tshuaj tiv thaiv los yog absorbed nyob rau hauv ib tug endothermic cov tshuaj tiv thaiv. Kev lag luam instant txias pob khoom feem ntau siv ob qho tib si ammonium nitrate los yog urea raws li lawv ntsev tivthaiv; cov pob khoom kub feem ntau siv magnesium sulfate los yog calcium chloride.
Hauv qhov no, cov tshuaj dab tsi siv rau hauv cov pob kub kub?
Ib qho yooj yim tshuaj kub pob khoom muaj peev xwm cuam tshuam cov calcium chloride, tseem hu ua pob zeb ntsev, rau hauv dej. Raws li cov muaju ntawm pob zeb ntsev yaj, lawv tsim kub los ntawm cov txheej txheem ntawm calcium chloride dissolving rau hauv nws cov ionic collective.
Tom qab, lo lus nug yog, dab tsi yog cov khoom kub thiab txias siv rau? Kub tuaj yeem ua kom ntshav txaus thiab pab rov qab txav mus rau cov ntaub so ntswg raug mob. Kev sov tuaj yeem txo cov leeg pob txha, mob, thiab cov leeg nqaij. Raws li nrog cov hnab txias , cov khoom kub muaj lub luag haujlwm los txo qhov mob los ntawm kev raug mob hnyav thiab mob ntev, xws li pob txha, kab mob, cov leeg nqaij spasms, whiplash, thiab mob caj dab.
Kuj Paub, ua li cas cov pob khoom kub ua haujlwm?
Kub pob / Txias Pob . Tshuaj tuaj yeem khaws lub zog thiab tso tawm hauv daim ntawv ntawm kub . A tshuaj cov tshuaj tiv thaiv uas tso tawm kub hu ua exothermic reaction. Tab sis tshuaj cov tshuaj tiv thaiv kuj tuaj yeem nqus tau kub los ntawm ib puag ncig thiab tau txias.
Puas yog Boiling Dej endothermic lossis exothermic?
Peb txhua tus tuaj yeem txaus siab rau qhov ntawd dej tsis spontaneously boil ntawm chav tsev kub; xwb peb yuav tsum tau cua sov nws. Vim peb yuav tsum ntxiv cua sov, boiling dej yog ib txoj kev uas chemists hu endothermic . Kom meej meej, yog tias qee cov txheej txheem xav tau cua sov, lwm tus yuav tsum muab cov cua sov thaum lawv ua. Cov no yog hu ua exothermic.
Pom zoo:
Hom tshuaj twg pom nyob rau hauv cov khoom ntawm cov tshuaj tiv thaiv decomposition?
Cov tshuaj tiv thaiv decomposition tshwm sim thaum ib qho reactant tawg mus rau hauv ob lossis ntau yam khoom. Qhov no tuaj yeem sawv cev los ntawm kev sib npaug dav: AB → A + B. Cov piv txwv ntawm cov tshuaj tiv thaiv decomposition muaj xws li kev tawg ntawm hydrogen peroxide rau dej thiab oxygen, thiab kev tawg ntawm cov dej mus rau hydrogen thiab oxygen
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 khoom twg yog cov piv txwv ntawm cov khoom siv tshuaj xyuas txhua yam uas siv?
Piv txwv ntawm cov khoom siv tshuaj muaj xws li flammability, toxicity, acidity, reactivity (ntau hom), thiab kub ntawm combustion. Hlau, piv txwv li, ua ke nrog oxygen nyob rau hauv lub xub ntiag ntawm dej los ua xeb; chromium tsis oxidize (Daim duab 2)
Dab tsi yog cov units siv rau qhov kub thiab txias?
Qhov ntsuas feem ntau yog cov ntsuas Celsius (yav tas los hu ua centigrade), qhia ° C, Fahrenheit scale (denoted ° F), thiab Kelvin scale (denoted K), tom kawg uas yog feem ntau siv rau kev tshawb fawb los ntawm cov rooj sib tham ntawm International System of Units (SI)
Puas yog cov tshuaj tiv thaiv endothermic nce hauv qhov kub thiab txias?
Yog hais tias cov tshuaj tiv thaiv endothermic raws li sau tseg, qhov kub thiab txias yuav ua rau cov tshuaj tiv thaiv pem hauv ntej tshwm sim, ua kom cov khoom muaj nqis thiab txo cov reactants. Txo qhov kub thiab txias yuav ua rau cov lus teb rov qab. Kev hloov pauv ntawm qhov kub tsis muaj qhov cuam tshuam rau cov tshuaj tiv thaiv athermal