Video: Dab tsi yog daim ntawv cog lus siab dissociation zog txhais tau li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov bond dissociation zog los yog, ntau dua, homolytic bond dissociation zog (Symbol: BDE) ntawm acovalent daim ntawv cog lus yog lub zog yuav tsum tau rhuav lub daim ntawv cog lus homolytically (saib homolysis) raws li tus qauv. Cov siab dua tus bond dissociation zog , lub zog daim ntawv cog lus.
Tsis tas li ntawd, daim ntawv cog lus dissociation zog txhais li cas?
Bond dissociation zog yog cov zog yuav tsum tau rhuav ib qho tshuaj daim ntawv cog lus . Nws yog ib qho txhais tau tias ofquantifying lub zog ntawm ib tug tshuaj daim ntawv cog lus . Bonddissociation zog sib npaug daim ntawv cog lus zog tsuas yog rau diatomicmolecules. Lub zog tshaj bond dissociation zog yog rau Si-F daim ntawv cog lus.
Tsis tas li ntawd, homolytic bond dissociation zog yog dab tsi? Cov homolytic bond dissociation zog yog tus nqi ntawm zog yuav tsum tau sib cais ib mole ntawm covalently bonded gases rau hauv ib khub ntawm radicals. Cov chav SI siv los piav qhia daim ntawv cog lus zog yog kiloJoules ib mole ntawm daim ntawv cog lus (kJ/Mol). Nws qhia tau hais tias cov atoms muaj zog npaum li cas rau ib leeg.
Ua raws li qhov no hauv kev xav, dab tsi yog daim ntawv cog lus siab dissociation enthalpy?
A high bond dissociation zog txhais tau tias cov daim ntawv cog lus (thiab molecule) yog tsawg zog thiab ruaj khov. Bond lub zog nyob ntawm tus naj npawb ntawm daim ntawv cog lus nruab nrab ntawm atoms. Txawm tias π daim ntawv cog lus tsis muaj zog tshaj σ daim ntawv cog lus ,ib ob daim ntawv cog lus , uas muaj σ thiab π yog daim ntawv cog lus , muaj zog tshaj ib leeg daim ntawv cog lus vim muaj ob daim ntawv cog lus.
Dab tsi yog lub cim rau daim ntawv cog lus dissociation zog?
Cov bond dissociation zog los yog, ntau dua, homolytic bond dissociation zog ( cim : BDE) ntawm acovalent daim ntawv cog lus yog cov zog yuav tsum tau rhuav lub daim ntawv cog lus homolytically (saib homolysis) raws li tus qauv. eg. 1: np. 2: Ua bond dissociation zog ntawm a daim ntawv cog lus yog qhov ntsuas ntawm nws lub zog.
Pom zoo:
Yuav ua li cas yog daim ntawv cog lus sib txawv ntawm daim ntawv cog lus ionic?
Qhov sib txawv ntawm cov ionic thiab covalent daim ntawv cog lus yog tias covalent daim ntawv cog lus yog tsim thaum ob lub atoms sib koom electrons. Ionic bonds yog lub zog uas tuav ua ke electrostatic zog ntawm kev nyiam ntawm cov ions oppositely them. Ionic bonds muaj qhov sib txawv electronegativity ntau dua lossis sib npaug li 2
Dab tsi yog qhov txawv ntawm daim ntawv cog lus lub zog thiab daim ntawv cog lus dissociation zog?
Qhov sib txawv tseem ceeb ntawm kev sib txuas ntawm lub zog thiab lub zog bonddissociation yog tias lub zog sib txuas yog qhov nruab nrab ntawm lub zog xav tau los rhuav tshem tag nrho cov kev sib txuas ntawm tib ob hom atoms nyob rau hauv ib qho chaw sib txuas whereas daim ntawv cog lus dissociation zog yog tus nqi ntawm cov hluav taws xob xav tau los rhuav tshem ib qho kev sib koom ua ke inhomolysis
Dab tsi yog daim ntawv cog lus ionic thiab nws tsim li cas?
Ionic daim ntawv cog lus, tseem hu ua electrovalent bond, hom kev sib txuas tsim los ntawm electrostatic attraction ntawm oppositely them ions nyob rau hauv ib tug tshuaj compound. Xws li daim ntawv cog lus thaum lub valence (sab nrauv) electrons ntawm ib lub atom raug xa mus tas li mus rau lwm lub atom
Puas yog daim ntawv cog lus hydrogen zoo ib yam li daim ntawv cog lus?
Hydrogen daim ntawv cog lus yog lub npe muab rau electrostatic kev sib cuam tshuam ntawm tus nqi zoo ntawm hydrogen atom thiab tus nqi tsis zoo ntawm oxygen atom ntawm ib qho chaw nyob sib ze. Covalent daim ntawv cog lus yog qhov sib cuam tshuam electrostatic ntawm ob lub atom hauv tib lub molecule
Yuav ua li cas koj txiav txim siab yog tias daim ntawv cog lus yog polar tsis muaj lub rooj electronegativity?
Kauj Ruam 2: Txheeb xyuas txhua daim ntawv cog lus raws li polar lossis nonpolar. (Yog hais tias qhov sib txawv ntawm electronegativity rau cov atoms nyob rau hauv ib daim ntawv cog lus yog ntau tshaj 0.4, peb xav txog daim ntawv cog lus polar. Yog hais tias qhov sib txawv ntawm electronegativity tsawg dua 0.4, daim ntawv cog lus yog qhov tseem ceeb nonpolar.) Yog tias tsis muaj polar bonds, lub molecule yog tsis muaj polar