Ib daim ntawv cog lus uas tsis muaj polar tshwm sim thaum atoms faib cov electrons sib npaug, thiab cov hluav taws xob tsis siv sijhawm ntau nyob ib puag ncig ntawm ob lub atoms. Ib pa roj carbon monoxide (O2) molecule muaj cov nyiaj tsis muaj polar covalent.
Lub molecule twg muaj covalent daim ntawv cog lus uas tsis yog-polar?
Ib qho piv txwv ntawm daim ntawv cog lus uas tsis muaj polar yog qhov daim ntawv cog lus ntawm ob lub atoms hydrogen vim tias lawv sib npaug sib faib cov electrons. Lwm qhov piv txwv ntawm daim ntawv cog lus nonpolar covalent yog daim ntawv cog lus ntawm ob lub chlorine atoms vim tias lawv kuj sib npaug ntawm cov electrons.
Yuav ua li cas cov nram qab no muaj ib tug nonpolar covalent?
Tab sis hauv CH3CH3, cov electronegativity ntawm C (2.5) thiab H(2.1) yuav luag zoo sib xws, uas txhais tau hais tias sib npaug sib npaug ntawm cov hluav taws xob tau ua los ntawm cov atoms sib txuas. Yog li ntawm cov molecules muab, CH3CH3 daim ntawv cog lus nonpolar covalent.
Puas yog CO2 yog daim ntawv cog lus uas tsis muaj polar?
Molecules ua los ntawm ntau tshaj ib hom covalently bonded nonmetal atoms, xws li cov pa roj carbon dioxide (CO2), tseem tsis muaj polaryog tias lawv sib npaug lossis yog tias lawv cov atoms muaj qhov sib npaug sib npaug.. Txawm tias cov tebchaw loj xws li roj av hexane (C6H14), yog symmetrical thiab nonpolar.
Yuav ua li cas yog qhov kev txiav txim ntawm covalent cim?
Nyob rau hauv cov molecules muab peb tuaj yeem pom tias cov anion txuas rau txhua lub molecule yog tib yam piv txwv li chlorine tab sis cations txawv. Thiab qhov kev txiav txim ntawm electronegativity ntawm cations yog li: ${text{Na < Li < Be}}$. Yog li qhov kev txiav txim nce ntxiv ntawm tus cwj pwm covalent yuav yog: ${text{NaCl < LiCl < BeC}}{{text{l}}_2}$
