Vim li cas cov khoom ntshiab muaj qhov melting ntau dua?
Vim li cas cov khoom ntshiab muaj qhov melting ntau dua?

Video: Vim li cas cov khoom ntshiab muaj qhov melting ntau dua?

Video: Vim li cas cov khoom ntshiab muaj qhov melting ntau dua?
Video: Kho caj kho cev by Celesna Lor 2024, Kaum ib hlis
Anonim

Lub luag haujlwm ntawm lub zog ntawm intermolecular

Cov rog no yuav tsum raug cuam tshuam thaum a tshuaj yaj , uas yuav tsum tau ib tug input ntawm lub zog. Lub tswv yim ntawm lub zog txhais mus rau qhov kub siab. Yog li, qhov muaj zog zog uas tuav ua ke ib qho khoom, lub siab dua nws melting point.

Tsis tas li ntawd, qhov melting point ntawm ib yam khoom ntshiab yog dab tsi?

Melting point , kub ntawm uas cov khoom thiab cov ntaub ntawv ua kua ntawm a cov khoom ntshiab tuaj yeem nyob hauv kev sib npaug. Raws li cua sov yog siv rau ib qho khoom, nws kub yuav nce mus txog qhov melting point mus txog.

Qhov thib ob, yog vim li cas ntxiv impurities txo melting point? Cov impurities nyob rau hauv cov khoom feem ntau qis tus melting point vim lawv cuam tshuam lub pristine crystal lattice. Ntxiv impurities mus rau ib tug kua feem ntau tsa lub boiling taw tes vim nce kev daws teeb meem theem entropy. Los yog koj tuaj yeem xav txog qhov impurity raws li txo qis lub vapor siab ntawm cov kua.

Tom qab ntawd, dab tsi ua rau lub melting point siab dua li cov ntaub ntawv muaj nqis?

Ib qho ntshiab organic compound feem ntau yaj ntau tshaj li ob degrees lossis tsawg dua. Ib qho piv txwv tsis huv yog tias nws muaj melting point ntau yam uas qis dua thiab/lossis dav dua tshaj tias cov cov ntaub ntawv muaj nqis . Ntau impurities nce qhov no tshwm sim.

Vim li cas impurities cuam tshuam rau melting point?

Cov impurities nyob rau hauv ib qho khoom ua rau a melting point kev nyuaj siab vim tus impurity cuam tshuam lub zog siv lead ua lattice. Qhov ntau concentrated lub solute, ntau dua qhov cuam tshuam thiab qis dua qhov khov taw tes ntawm qhov kev daws teeb meem. Lub tswv yim no tuaj yeem siv rau melting point (los yog khov taw tes ) ntawm ib tug ntshiab compound.

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