Video: Hom tshuaj tiv thaiv zoo li cas tshwm sim ntawm nws tus kheej lossis spontaneously?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Exothermic cov tshuaj tiv thaiv nyiam ua tus kheej vim lawv tso lub zog tag nrho ( tus "pob" yog dov tus toj uas tso tawm zog). Ob leeg cov tshuaj tiv thaiv muaj ib pob me me kom kov yeej hu tus activation zog ( tus lub zog xav tau kom tau txais cov molecules txav nrawm txaus los sib tsoo rau hauv ib leeg thiab hnov mob).
Ib yam li ntawd, nws raug nug, hom tshuaj tiv thaiv dab tsi tshwm sim ntawm nws tus kheej?
Energy In thiab Energy Out Nyob rau hauv cov nqe lus ntawm lub zog, muaj ob hom tshuaj tiv thaiv: endothermic cov tshuaj tiv thaiv thiab exothermic tshuaj tiv thaiv . Hauv exothermic tshuaj tiv thaiv , ntau lub zog raug tso tawm thaum daim ntawv cog lus tsim hauv cov khoom dua li siv los rhuav cov ntawv cog lus hauv reactants.
hom tshuaj tiv thaiv dab tsi ib txwm tso tawm lub zog? A tshuaj tiv thaiv hauv qhov twg zog yog tso tawm mus rau ib puag ncig yog hu ua exothermic tshuaj tiv thaiv . Hauv no hom tshuaj tiv thaiv cov enthalpy, los yog khaws cia tshuaj zog , yog qis dua rau cov khoom lag luam dua li cov reactants.
Qhov thib ob, hom tshuaj tiv thaiv twg feem ntau tshwm sim spontaneously endothermic lossis exothermic?
Endothermic vs Exothermic sib piv
| Endothermic | Exothermic |
|---|---|
| cua sov yog absorbed (xws li txias) | cua sov tso tawm (xav tias sov) |
| lub zog yuav tsum tau ntxiv rau qhov tshwm sim | cov tshuaj tiv thaiv tshwm sim spontaneously |
| Kev tsis sib haum xeeb (ΔS <0) | Entropy nce (ΔS > 0) |
| nce hauv enthalpy (+ ΔH) | Txo hauv enthalpy (-ΔH) |
Yuav tsum muaj dab tsi los pib tshuaj tiv thaiv?
Tag nrho tshuaj tiv thaiv , txawm exothermic cov tshuaj tiv thaiv , xav tau activation zog pib. Activation zog yog xav tau coj reactants ua ke kom lawv ua tau teb . Ceev npaum li cas a tshuaj tiv thaiv tshwm sim yog hu ua tshuaj tiv thaiv tus nqi.
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