Cov dej sib txawv li cas hauv qab nws qhov melting point thiab saum nws?
Cov dej sib txawv li cas hauv qab nws qhov melting point thiab saum nws?

Video: Cov dej sib txawv li cas hauv qab nws qhov melting point thiab saum nws?

Video: Cov dej sib txawv li cas hauv qab nws qhov melting point thiab saum nws?
Video: Cov phev muaj me nyuam thiab cov tsi muaj es sib txawv li cas 2024, Hlis ntuj nqeg
Anonim

Cov dej sib txawv li cas hauv qab nws qhov melting point thiab saum toj no nws? Hauv qab no nws nyob ze ua ke thiab lawv thaws tawm ntawm ib leeg. Saum toj no cov molecules tau txawm ze dua hauv qab no . Cov boil / condensation taw tes ntawm dej yog 373k.

Yog li ntawd, vim li cas cov ntsiab lus melting thiab khov yog tib yam?

khov thiab yaj tsuas yog cov ntsiab lus sib txawv siv los piav txog kev hloov pauv ntawm cov khoom siv thiab cov kua dej. khov feem ntau txhais tau hais tias lub zog raug tshem tawm ntawm cov khoom siv (kua hloov mus rau cov khoom) thiab yaj feem ntau txhais tau hais tias lub zog tau ntxiv rau cov khoom siv (khoom yog hloov mus rau kua).

Ib tug kuj yuav nug, dej puas txo cov ntsiab lus melting? Melting so kom sov ("latent heat") vim tias cov kua muaj zog ntau dua li cov khoom. Qhov ntawd ua rau cov dej khov thiab qab ntsev dej kom qis dua 0 ° C. Yog li ntawd, nws qis qhov tseeb kub.

Ib yam li ntawd, koj tuaj yeem nug, koj yuav paub li cas yog tias lub melting point ntawm lub compound yog siab dua los yog qis dua chav tsev kub?

Yog tus ib txwm melting point ntawm ib yam khoom yog hauv qab chav tsev kub , cov yam khoom yog kua ntawm chav kub . Benzene yaj ntawm 6 ° C thiab boils ntawm 80 ° C; nws yog kua ntawm chav kub . Yog ob lub ib txwm melting point thiab cov ib txwm boiling point yog saum toj no chav kub , cov yam khoom yog ib yam khoom.

Yam khoom twg muaj qhov melting ntau dua li dej?

Sodium chloride melts ntawm 801 ° C. Dej khov (khoom H 2 O) yog molecular compound uas nws cov molecules tuav ua ke los ntawm hydrogen daim ntawv cog lus. Txawm li cas los hydrogen bonds yog qhov muaj zog tshaj ntawm lub zog ntawm intermolecular, lub zog ntawm hydrogen Cov ntawv cog lus tsawg dua li ntawm cov ntawv cog lus ionic.

Melting Point.

Khoom siv Melting Point (°C)
hlau 1538

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