Vim kev tawg ntawm thaj chaw ntawm cov molecules txo qis uas ua rau nws sib zog dua, nws yuav yooj yim dua ntim lawv kom nruj thiab nws yuav nyuaj rau tawg cov qauv compact li no piav qhia tias vim yog branching melting point nce.
Yuav ua li cas nce melting point?
Lub zog muaj zog ntau dua yog, lub zog ntau dua, yog li qhov siab dua qhov melting yog. Ntau lub zog intermolecular nyob ntawm seb muaj zog atoms hauv cov molecule nyiam electrons - lossis lawv cov electronegativity.
Puas muaj ceg ntau ntxiv ua rau kub hnyiab?
Branching txo qhov kub hnyiab Yog li qhov nce ntawm thaj chaw saum npoo yuav ua rau muaj peev xwm ntawm cov molecules rau ib leeg. Branching nyob rau hauv molecules txo qhov chaw saum npoo yog li txo lub zog txaus nyiam ntawm ib tus neeg molecules. Raws li qhov tshwm sim, qhov kub kub txo qis.
Puas cov ceg ntoo alkanes puas muaj cov ntsiab lus melting ntau dua?
Txawm tias muaj tus lej sib npaug ntawm C atoms, isomeric branched alkanes pom cov ntsiab lus sib txawv. Raws li txoj cai ntawm tus ntiv tes xoo, ntau asymmetric lub molecule qis dua qhov melting point. Lub luag haujlwm rau tus cwj pwm no yog qhov txo qis ntawm van der Waals rog ntawm cov molecules nrog nce branching.
Yuav ua li cas rau qhov kub hnyiab thaum ceg nce?
cov ntsiab lus kub nce raws li cov pa roj carbon ntau ntxiv. Branching txo qhov kub hnyiab.
