Video: Lub zog ntawm CC yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ntawm no, peb yuav tsum tau tawg C = C daim ntawv cog lus hauv ethene, thiab H-H daim ntawv cog lus hauv H2. (Saib Bond Zog rooj nyob hauv qab ntawm nplooj ntawv no) A H-H daim ntawv cog lus enthalpy (BE) yog 436 kJ/mol, C = C daim ntawv cog lus yog 602 kJ/mol, a C-C daim ntawv cog lus yog 346 kJ/mol, C-H BE yog 413 kJ/mol.
Ib yam li ntawd, nws raug nug, dab tsi yog daim ntawv cog lus dissociation zog rau CC?
Common Bond Energies (D
| Bond | D (kJ/mol) | r (pm) |
|---|---|---|
| C-C | 346 | 154 |
| C = C | 602 | 134 |
| C≡C | 835 | 120 |
| C-Si | 318 | 185 |
Kuj Paub, lub zog ntawm CO yog dab tsi? Cov daim ntawv cog lus zog ntawm C = O, i.e. the zog hloov rau cov tshuaj tiv thaiv CO (g) → C(g) + O(g) yog 1079 kJ/mol. Qhov no yog qhov muaj zog tshaj plaws daim ntawv cog lus paub txog ib tug diatomic molecule. Tab sis qhov no yog atypical nyob rau hauv lub siab, vim nws yog ntau dua triple daim ntawv cog lus dua ib ob daim ntawv cog lus.
Ua li no, koj yuav ua li cas xam nyiaj txiag zog?
Bond zog yog txhais los ntawm cov sum ntawm tag nrho cov daim ntawv cog lus tawg rho tawm tag nrho cov daim ntawv cog lus ua: ΔH = ∑H( daim ntawv cog lus tawg) - ∑ H( daim ntawv cog lus tsim). ΔH yog qhov hloov pauv hauv daim ntawv cog lus zog , kuj hu ua tus daim ntawv cog lus enthalpy thiab ∑H yog cov lej ntawm cov daim ntawv cog lus zog rau txhua sab ntawm qhov sib npaug.
Qhov twg daim ntawv cog lus muaj zog dua CC lossis CO?
Yuav ua li cas yog C-O daim ntawv cog lus muaj zog tshaj qhov C-C daim ntawv cog lus tab sis C-N daim ntawv cog lus yog qaug zog dua ob qho no daim ntawv cog lus ? Nws ua rau kev nkag siab tias C-O yog muaj zog dua tshaj C-C . Qhov sib txawv ntawm electronegativity yog ntau dua uas ua rau cov cim ionic nce ntxiv thaum cov pa oxygen atom me dua, uas ua rau muaj kev sib tshooj orbital.
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