Ib yam khoom ntshiab muaj ib lub ntsiab lus melting ntse (kub ntawm ib qhov kub) thiab lub qhov kub hnyiab (boils ntawm ib qhov kub). Ib qho kev sib tov melts dhau ntawm qhov kub thiab txias dhau ntawm qhov kub thiab txias. Homogeneous sib tov yog hu ua kev daws teeb meem. … Heterogeneous tshuaj yeej ib txwm sib tov.
Yuav ua li cas rau cov khoom ntshiab thaum nws yaj?
Cov khoom melts thiab tig mus ua kua. Cov khoom ntawm ib yam khoom thaum nws yog khoom, kua los yog roj tseem zoo li qub. Lawv atomic lossis molecular configuration tsis hloov. Tsuas yog tus nqi ntawm lub zog hauv txhua qhov ntawm cov khoom nce ntxiv thaum nws yaj.
Yuav ua li cas yog cov yaj ntawm cov tshuaj ntshiab?
Kev piav qhia: Cov tshuaj ntshiab muaj ib qho kub uas lawv dhau los ua kua(lawv yaj). Qhov point no hu ua lub melting point. Nyob rau ntawm qhov kub no, lub zog ntawm cov molecules tau mus txog qhov kub thiab txias ntawm qhov sib txuas ntawm cov molecules tsis muaj zog.
Dab tsi yog cov khoom ntshiab ntawm lub melting point?
Ntshiab, crystalline solids muaj tus yam ntxwv melting point, kub uas cov khoom melts los ua kua . Kev hloov pauv ntawm cov khoom thiab cov kua yog ntse heev rau cov qauv me me ntawm cov khoom ntshiab uas cov ntsiab lus melting tuaj yeem ntsuas rau 0.1 o C.
Yuav ua li cas thaum melting?
Melting yog txheej txheem uas ua rau cov khoom hloov pauv ntawm cov khoom mus rau ib qhoua kua. Melting tshwm sim thaum cov molecules ntawm ib qho khoom nrawm nrawm txaus kom cov lus tsa suab kov yeej cov kev nyiam kom cov molecules txav tau dhau los ua kua.
