Yog hais tias ib lub molecule yog symmetrically, ces lub sij hawm dipole vectors ntawm txhua molecule yuav tshem tawm ib leeg, ua rau cov molecule nonpolar. Lub molecule tsuas tuaj yeem ua polar yog tias cov qauv ntawm cov molecule tsis sib haum.
Dipole rho tawm li cas?
ob daim ntawv cog lus yog polar, tab sis raws li lawv "sib npaug thiab rov qab" (kom ua piv txwv rau lub zog), cov dipoles tshem tawm, lossis ntxiv rau tag nrho xoom, yog tias koj xav xav txog qhov ntawd. Raws li daim duab qhia, qhov no ua rau cov molecule uas tsis zoo ntawm txhua qhov kawg thiab qhov zoo hauv nruab nrab.
Can dipole moments cancel?
Cov dipoles yuav tso tseg yog tias lawv nyob rau hauv qhov kev taw qhia thiab ntawm qhov loj tib yam. Lawv yuav zoo tib yam yog tias lawv koom nrog tib lub atoms. Yog hais tias lub dipoles tso tseg, cov txiaj ntsig molecule yuav tsis yog polar nrog polar bonds.
Yuav ua li cas daim ntawv cog lus dipoles nyob rau hauv lub ncov qaumteb qabteb molecule rho?
Polar molecules yuav tsum muaj polar bonds vim qhov sib txawv ntawm electronegativity ntawm bonded atoms. Ib tug polar molecule nrog ob los yog ntau dua polar bonds yuav tsum muaj ib tug geometry uas yog asymmetric nyob rau hauv tsawg kawg yog ib qho kev taw qhia, yog li ntawd cov nyiaj dipoles tsis thim ib leeg
Vim li cas dipoles hauv CO2 tshem tawm?
Ib lub molecule zoo li CO2 tuaj yeem tsim los ntawm ob lub dipoles, tab sis nws tsis muaj lub sijhawm dipole. Qhov no yog vim tus nqi sib npaug ntawm tag nrho cov molecule. Thaum cov molecules muaj ib qho kev faib tawm thiab tsis muaj lub sijhawm dipole, ces lawv yog nonpolar molecules.
