Piv txwv cov lus nug thiab kev sib tham txog kev hloov pauv sib npaug
Kev hloov pauv ntawm qhov sib npaug yog ib qho tseem ceeb hauv kev tshawb fawb txog chemistry, tshwj xeeb tshaj yog hauv kev kawm txog kev sib npaug ntawm cov tshuaj lom neeg. Lub hauv paus ntsiab lus tseem ceeb uas piav qhia txog kev hloov pauv ntawm qhov sib npaug yog Le Chatelier's Principle, uas hais tias: "Yog tias ib lub cev uas muaj kev sib npaug raug kev hloov pauv (kev ntxhov siab), lub cev yuav hloov kho kom txo qhov cuam tshuam ntawm kev hloov pauv thiab mus txog qhov xwm txheej tshiab ntawm kev sib npaug."
Hauv tsab xov xwm no, peb yuav tham txog qee cov lus nug piv txwv thiab kev sib tham txog kev hloov pauv sib npaug kom pab nkag siab lub tswv yim no tob dua.
Piv txwv lus nug 1: Kev hloov pauv ntawm qhov sib npaug ntawm siab
Lo lus nug:
Cov pa roj nitrogen tetroxide (N2O4) yuav lwj mus ua nitrogen dioxide (NO2) raws li cov qauv tshuaj tiv thaiv:
\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\text{NO}_2\text{(g)} \]
Thaum muaj qhov kub thiab txias, qhov kev tshuaj tiv thaiv no nyob rau ntawm qhov sib npaug. Yog tias tag nrho lub siab ntawm lub cev nce ntxiv, qhov sib npaug yuav hloov mus rau qhov twg?
Kev Sib Tham:
Raws li Le Chatelier Txoj Cai, yog tias qhov siab ntawm lub kaw lus hauv qhov sib npaug nce ntxiv, qhov sib npaug yuav hloov mus rau sab nrog tsawg dua cov roj molecules kom txo qhov kev hloov pauv ntawm qhov siab.
Hauv qhov kev tshuaj tiv thaiv tau muab:
\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\text{NO}_2\text{(g)} \]
ntawm sab laug (reactants), muaj 1 mole ntawm cov roj (N2O4), thiab ntawm sab xis (khoom) muaj 2 moles ntawm cov roj (NO2).
Thaum lub siab nce ntxiv, qhov sib npaug yuav hloov mus rau sab laug (mus rau N2O4) uas muaj cov roj molecule tsawg dua los txo qhov siab.
Piv txwv lus nug 2: Kev hloov pauv ntawm qhov kub thiab txias sib npaug
Lo lus nug:
Xav txog cov lus teb nram qab no:
\[ \text{2NO}_2\text{(g)} \rightleftharpoons \text{N}_2\text{O}_4\text{(g)} + \text{Kub} \]
Yog tias qhov kub nce ntxiv, qhov sib npaug puas yuav hloov mus rau sab xis lossis sab laug?
Kev Sib Tham:
Qhov kev tshuaj tiv thaiv saum toj no yog exothermic, txhais tau tias cua sov raug tso tawm thaum qhov kev tshuaj tiv thaiv mus rau kev tsim N2O4 (cov khoom). Raws li Le Chatelier Txoj Cai, yog tias qhov kub ntawm lub kaw lus nce ntxiv, qhov sib npaug yuav hloov mus rau hauv qhov kev taw qhia uas nqus cua sov kom txo qhov kev hloov pauv kub (hauv qhov kev taw qhia endothermic).
Hauv qhov no, nrog rau qhov kub nce ntxiv, qhov sib npaug yuav hloov mus rau sab laug, mus rau NO2 (tus reactant), vim tias qhov thim rov qab ntawm qhov tshuaj tiv thaiv nqus cua sov.
Piv txwv lus nug 3: Kev hloov pauv ntawm qhov sib npaug ntawm qhov concentration
Lo lus nug:
Muab cov tshuaj tiv thaiv sib npaug hauv qab no:
\[ \text{H}_2\text{(g)} + \text{I}_2\text{(g)} \rightleftharpoons 2\text{HI}\text{(g)} \]
Yog tias peb ntxiv H2 ntau ntxiv rau hauv lub system, yuav muaj dab tsi tshwm sim rau qhov sib npaug?
Kev Sib Tham:
Raws li Le Chatelier Txoj Cai, yog tias qhov concentration ntawm ib qho ntawm cov reactants nce, qhov sib npaug yuav hloov mus rau hauv qhov kev taw qhia uas txo qhov kev hloov pauv, uas yog mus rau cov khoom.
Hauv qhov no, qhov nce ntxiv ntawm H2 yuav ua rau qhov sib npaug hloov mus rau sab xis, mus rau kev tsim cov HI ntau dua.
Piv txwv lus nug 4: Qhov cuam tshuam ntawm kev ntxiv ib qho Catalyst rau kev sib npaug
Lo lus nug:
Qhov ntxiv ntawm cov catalyst cuam tshuam li cas rau qhov chaw sib npaug hauv cov tshuaj sib npaug hauv qab no?
\[ \text{2SO}_2\text{(g)} + \text{O}_2\text{(g)} \rightleftharpoons 2\text{SO}_3\text{(g)} \]
Kev Sib Tham:
Cov tshuaj catalysts ua rau kom muaj kev sib xyaw ua ke ntawm ob qho kev sib xyaw ua ke mus tom ntej thiab rov qab los ntawm kev txo lub zog ua kom muaj zog. Txawm li cas los xij, cov tshuaj catalysts tsis cuam tshuam rau qhov chaw sib npaug; lawv tsuas yog pab lub cev kom sib npaug sai dua. Yog li ntawd, kev ntxiv cov tshuaj catalyst yuav tsis hloov qhov chaw sib npaug.
Piv txwv lus nug 5: Kev sib npaug ntawm cov tshuaj
Lo lus nug:
Muab qhov kev sib xyaw ua ke ntawm cov kua qaub tsis muaj zog HF hauv dej:
\[ \text{HF(aq)} \rightleftharpoons \text{H}^+\text{(aq)} + \text{F}^-\text{(aq)} \]
Yog tias ob peb grams ntawm NaF (uas yog ionized tag nrho rau hauv Na + thiab F-) ntxiv rau hauv HF kua, yuav ua li cas rau qhov chaw sib npaug?
Kev Sib Tham:
Qhov ntxiv ntawm NaF yuav ua rau kom muaj qhov concentration ntawm F-ions hauv cov tshuaj. Raws li Le Chatelier's Principle, kev nce qhov concentration ntawm cov khoom (F-) yuav ua rau qhov sib npaug hloov mus rau sab laug (ua rau muaj HF) kom txo qhov kev hloov pauv.
Piv txwv lus nug 6: Kev sib npaug thiab pH
Lo lus nug:
Muab cov tshuaj tiv thaiv sib npaug hauv qab no:
\[ \text{CO}_2\text{(g)} + \text{H}_2\text{O(l)} \rightleftharpoons \text{H}_2\text{CO}_3\text{(aq)} \]
Kev hloov pauv ntawm pH ntawm cov tshuaj cuam tshuam li cas rau qhov sib npaug?
Kev Sib Tham:
Kev ionization ntawm H2CO3 hauv dej tsim cov H+ ions thiab bicarbonate ions (HCO3-):
\[ \text{H}_2\text{CO}_3\text{(aq)} \rightleftharpoons \text{H}^+\text{(aq)} + \text{HCO}_3^-\text{(aq)} \]
Yog tias pH ntawm cov tshuaj txo qis (ntau dua acidic / nce hauv H +), qhov sib npaug ntawm hydration ntawm CO2 rau H2CO3 yuav hloov mus rau qhov txo qis ntawm H + ions, uas yog, mus rau cov reactants (CO2 thiab H2O). Yog tias pH nce (ntau dua yooj yim / txo qis hauv H +), qhov sib npaug yuav hloov mus rau cov khoom (H2CO3) uas tsim ntau H + los them rau qhov kev hloov pauv.
Tag nrho cov kev sib tham txog kev sib npaug ntawm cov tshuaj no yuav qhia txog kev hloov pauv ntawm qhov siab, qhov kub thiab txias, kev sib sau ua ke, kev ntxiv cov tshuaj catalysts, thiab cov xwm txheej ntawm cov tshuaj cuam tshuam rau qhov chaw sib npaug li cas, ua raws li Le Chatelier's Principle. Kev nkag siab txog lub hauv paus ntsiab lus no yog qhov tseem ceeb hauv ntau yam kev siv tshuaj lom neeg, los ntawm kev lag luam mus rau kev tshawb fawb hauv chaw kuaj mob.
Los ntawm kev nkag siab txog lub hauv paus ntsiab lus ntawm kev sib npaug thiab ntau yam piv txwv cov lus nug thiab cov lus piav qhia, koj yuav tsum muaj peev xwm txheeb xyuas thiab tshuaj xyuas cov xwm txheej tiag tiag uas cuam tshuam nrog kev sib npaug zoo dua hauv kev kawm thiab kev xyaum ua!
