Qhov Tseem Ceeb Qhov txawv - Homolytic vs Heterolytic Bond Dissociation Zog
Bond dissociation zog yog ib qho kev ntsuas ntawm lub zog ntawm daim ntawv cog lus tshuaj. Ib daim ntawv cog lus tuaj yeem sib cais ua homolytic lossis heterolytic yam. Bond dissociation zog yog txhais raws li tus txheej txheem enthalpy hloov thaum ib tug tshuaj daim ntawv cog lus yog cleaved ntawm homolysis. Homolytic bond dissociation zog yog tus nqi ntawm lub zog uas yuav tsum tau ua kom sib cais cov tshuaj lom neeg los ntawm hemolysis whereas heterolytic bond dissociation zog yog lub zog uas yuav tsum tau ua kom muaj cov tshuaj lom neeg ntawm heterolysis. Tus nqi ntawm homolytic bond dissociation zog yog txawv los ntawm heterolytic bond dissociation zog rau tib compound. Qhov no yog qhov sib txawv tseem ceeb ntawm homolytic thiab heterolytic bond dissociation zog.
Homolytic Bond Dissociation Zog yog dab tsi?
Homolytic bond dissociation zog yog tus nqi ntawm lub zog xav tau los cuam tshuam cov tshuaj lom neeg ntawm hemolysis. Hemolysis ntawm daim ntawv cog lus tshuaj yog qhov sib xyaw ua ke ntawm daim ntawv cog lus tsim ob lub radicals, tsis yog ob ions. Ntawm no, daim ntawv cog lus electrons ntawm lub atoms muab faib ua ob halves thiab raug coj los ntawm ob lub atoms. Piv txwv li, homolytic cleavage ntawm ib tug sigma daim ntawv cog lus ua ob radicals uas muaj ib tug unpaired electron rau txhua radical.
Daim duab 1: Homolysis
Cov nyiaj sib faib lub zog yog txhais raws li lub zog uas yuav tsum tau ua kom tshem tawm cov tshuaj lom neeg ntawm hemolysis ntawm cov txheej txheem. Homolytic bond dissociation zog txiav txim seb puas muaj tshuaj lom neeg muaj zog lossis tsis muaj zog. Yog hais tias tus nqi ntawm homolytic daim ntawv cog lus dissociation zog siab dua, nws qhia tau hais tias ib tug ntau npaum li cas ntawm lub zog yuav tsum tau muab nyob rau hauv thiaj li yuav cleave qhov nyiaj; yog li ntawd, nws yog ib daim ntawv cog lus ruaj khov.
Heterolytic Bond Dissociation Zog yog dab tsi?
Heterolytic bond dissociation zog yog tus nqi ntawm lub zog xav tau los clave ib qho tshuaj tiv thaiv ntawm heterolysis. Heterolysis yog cleavage ntawm cov tshuaj tiv thaiv nyob rau hauv asymmetrically. Heterolysis tsim cations thiab anions. Qhov no yog vim hais tias, nyob rau hauv heterolysis, daim ntawv cog lus electron khub yog coj los ntawm lub electronegative atom (nws yog hloov dua siab tshiab rau hauv lub anion) whereas lwm atom yuav tsis siv electrons (nws ua cov cation).
Daim duab 2: Heterolysis ntawm Tshuaj Bonds
Thaum piv nrog homolysis ntawm ib lub molecule, lub heterolysis ntawm tib lub molecule yog qhov txawv ntawm homolysis. Qhov no txhais tau hais tias homolytic daim ntawv cog lus dissociation zog ntawm ib tug compound yog txawv los ntawm heterolytic bond dissociation zog ntawm tib molecule.
Ex: Cia peb xav txog qhov sib cais ntawm H-H daim ntawv cog lus hauv hydrogen molecule.
Homolytic bond dissociation: H2 → H● + H● (bond dissociation zog yog 104 kcal/mol)
Heterolytic bond dissociation: H2 → H+ + H– (bond dissociation lub zog yog 66 kcal / mol)
Qhov txawv ntawm Homolytic thiab Heterolytic Bond Dissociation Zog yog dab tsi?
Homolytic vs Heterolytic Bond Dissociation Zog |
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| Homolytic bond dissociation zog yog tus nqi ntawm lub zog xav tau los cuam tshuam cov tshuaj lom neeg ntawm hemolysis. | Heterolytic bond dissociation zog yog tus nqi ntawm lub zog xav tau los clave ib qho tshuaj lom neeg ntawm heterolysis. |
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| Homolytic bond dissociation zog yog txuam nrog kev tsim cov radicals los ntawm kev sib cais ntawm cov tshuaj bonds. | Heterolytic bond dissociation zog yog txuam nrog kev tsim ntawm cations thiab anions los ntawm cleavage ntawm tshuaj bonds. |
Summary – Homolytic vs Heterolytic Bond Dissociation Zog
Bond dissociation zog yog lub zog yuav tsum tau txhawm rau txhawm rau txhawm rau tshuaj lom neeg ntawm homolysis ntawm cov qauv txheej txheem. Muaj ob hom kev sib cog lus cleavages li homolysis thiab heterolysis. Homolytic bond cleavage forms radicals whereas heterolytic bond cleavage forms cations thiab anions. Qhov sib txawv tseem ceeb ntawm homolytic thiab heterolytic bond dissociation zog yog tias tus nqi ntawm homolytic bond dissociation zog txawv ntawm cov heterolytic bond dissociation zog rau tib lub compound.
