Video: Thaum twg cov khoom yog rhuab thiab hloov mus rau hauv cov kua nws?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog ice (a khoom) yog rhuab nws kev hloov rau dej (a ua kua ). Qhov kev hloov no hu ua MELTING. Yog dej cua sov , nws kev hloov rau ncu (gas). Qhov kev hloov no hu ua BOILING.
Tsis tas li ntawd, dab tsi ua kua hloov mus ua ib qho khoom thaum rhuab?
Cyclodextrines yog cov qauv cyclic uas muaj cov pawg hydroxyl kawg uas tuaj yeem tsim cov ntawv cog lus hydrogen nrog 4MP lossis dej molecules. Ntawm chav tsev kub, txog li 300 grams ntawm αCD tuaj yeem yaj hauv ib liter ntawm 4MP. Qhov tshwm sim daws yog homogenous thiab pob tshab, tab sis nws dhau los ua cov khoom mis-dawb thaum rhuab.
Tsis tas li ntawd, yuav ua li cas tshwm sim thaum cov khoom yog rhuab? Thaum a khoom yog rhuab , cov molecules uas ua rau lub khov kho pib vibrate. Qhov no ua rau lawv siv ntau qhov chaw, thiab khov kho teeb meem nthuav. Yog tias kub txuas ntxiv tsim, nws tuaj yeem muab lub zog txaus rau cov khoom kom tawg tawm ntawm lawv qhov muaj zog txaus nyiam rau ib leeg, ua rau khov kho ua yaj.
Ib yam li ntawd ib tug yuav nug, nws hu li cas thaum cov khoom hloov mus ua kua?
Piv txwv li, a khov kho tuaj yeem ua ib ua kua . Qhov kev hloov theem no yog hu ua yaj. Thaum a khov kho kev hloov rau hauv gas, yog hu ua sublimation. Thaum lub roj hloov ua kua , yog hu ua condensation. Thaum a ua kua kev hloov rau hauv ib khov kho , yog hu ua solidification.
Yuav ua li cas thaum lub kua yog rhuab?
Raws li ib tug kua yog rhuab , nws cov molecules nqus kub thiab txav nrawm dua. Thaum lub ua kua pib boil, npuas ntawm vapor daim ntawv nyob rau hauv lub ua kua thiab nce mus rau saum npoo. (B) Evaporation thiab boiling ob leeg tshwm sim thaum dej cua sov . Thaum npuas tsim nyob rau hauv ua kua , nws tau mus txog nws lub boiling point thiab evaporates.
Pom zoo:
Koj puas ntxiv cov kua qaub rau hauv lub hauv paus lossis lub hauv paus rau cov kua qaub?
Ntxiv cov kua qaub ua kom cov concentration ntawm H3O + ions hauv cov tshuaj. Ntxiv ib lub hauv paus txo cov concentration ntawm H3O + ions hauv cov tshuaj. Cov kua qaub thiab lub hauv paus zoo li cov tshuaj tiv thaiv. Yog hais tias lub hauv paus yog ntxiv rau cov kua qaub, cov tshuaj yuav tsis acidic thiab txav mus rau nruab nrab ntawm pH nplai
Thaum koj kub calcium carbonate ib qho khoom dawb nrog cov mis CaCO3 nws tawg los ua cov khoom calcium oxide CaO thiab carbon dioxide gas co2?
Thaum tshav kub kub tshaj 840 ° C, calcium carbonate decomposes, tso cov pa roj carbon dioxide thiab tawm hauv qab calcium oxide - cov khoom dawb. Calcium oxide hu ua txiv qaub thiab yog ib qho ntawm 10 cov tshuaj uas tsim tawm txhua xyoo los ntawm thermal decomposition ntawm limestone
Dab tsi yog DNA zoo li cuam tshuam nws cov qauv tshuaj rau nws zoo li cas thaum muaj ntau ntawm nws yog clumped ua ke?
Hais txog nws cov qauv tshuaj rau nws zoo li cas thaum ntau nws yog clumped ua ke. DNA zoo li kab laug sab webs. DNA tau soluble hauv DNA extraction tsis yog li peb tsis pom nws. Thaum nws tau stirred rau hauv ethanol, nws clumped ua ke thiab tsim thicker thiab thicker strands loj txaus kom pom
Dab tsi nthwv dej zoo li cov cuab yeej ntawm lub teeb ua rau nws hloov kev taw qhia thaum nws txav ntawm ib nrab mus rau lwm qhov?
Refraction
Thaum twg cov khoom hloov pauv ncaj qha mus rau cov roj, qhov kev hloov ntawm lub xeev hu ua?
Sublimation yog tus txheej txheem ntawm transformation ncaj qha los ntawm cov khoom theem mus rau lub gaseous theem, tsis dhau los ntawm ib tug nruab nrab kua theem. Tsis tas li ntawd, nyob rau hauv qhov siab ntawm qhov siab ntawm triple point, qhov kub thiab txias yuav ua rau cov khoom hloov pauv mus rau cov roj yam tsis tau dhau los ntawm cov dej hauv cheeb tsam