Mafunso a Zitsanzo ndi Kukambirana za Kusintha kwa Kufanana
Kusintha kwa kufanana ndi nkhani yofunika kwambiri mu chemistry, makamaka pakuphunzira za kufanana kwa mankhwala. Mfundo yaikulu yofotokozera kusintha kwa kufanana ndi mfundo ya Le Chatelier, yomwe imati: "Ngati dongosolo lofanana likusintha (stress), dongosololi lidzasintha kuti lichepetse zotsatira za kusinthako ndikufika pamlingo watsopano wa kufanana."
Munkhaniyi, tikambirana mafunso ndi zokambirana zina zokhudzana ndi kusintha kwa mgwirizano kuti tithandize kumvetsetsa bwino lingaliro ili.
Chitsanzo Funso 1: Kusintha kwa Kufanana kwa Kupanikizika
Funso:
Mpweya wa nayitrogeni tetroxide (N2O4) umawonongeka kukhala nayitrogeni dioxide (NO2) malinga ndi njira yochitira zinthu:
\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\text{NO}_2\text{(g)} \]
Pa kutentha kwina, izi zimachitika pamlingo woyenera. Ngati kuthamanga konse kwa dongosololi kwawonjezeka, kodi muyezowo udzasunthira kuti?
Kukambirana:
Malinga ndi mfundo ya Le Chatelier, ngati kupanikizika pa dongosolo lomwe lili mu equilibrium kukukwera, equilibrium idzasunthira kumbali yokhala ndi mamolekyu ochepa a mpweya kuti achepetse kusintha kwa kupanikizika.
Mu yankho loperekedwa:
\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\text{NO}_2\text{(g)} \]
Kumanzere (ma reactants), pali mole imodzi ya mpweya (N2O4), ndipo kumanja (zopangidwa) pali mole ziwiri za mpweya (NO2).
Kupanikizika kukakwera, kufanana kudzasunthira kumanzere (kulowera ku N2O4) komwe kuli mamolekyu ochepa a mpweya kuti achepetse kuthamanga.
Chitsanzo Funso 2: Kusintha kwa Kufanana kwa Kutentha
Funso:
Taganizirani zomwe zinachitika:
\[ \text{2NO}_2\text{(g)} \rightleftharpoons \text{N}_2\text{O}_4\text{(g)} + \text{Heat} \]
Kodi kufanana kudzasintha kupita kumanja kapena kumanzere ngati kutentha kwawonjezeka?
Kukambirana:
Kachitidwe kamene kali pamwambaka ndi kotentha kwambiri, kutanthauza kuti kutentha kumatulutsidwa pamene kachitidweko kakupitirira kupangika kwa N2O4 (chopangidwacho). Malinga ndi mfundo ya Le Chatelier, ngati kutentha kwa dongosololi kwawonjezeka, mgwirizanowu udzasintha mbali yomwe imatenga kutentha kuti ichepetse kusintha kwa kutentha (kumbali ya endothermic).
Pankhaniyi, kutentha kukakwera, kufanana kudzasunthira kumanzere, kupita ku NO2 (reactant), chifukwa kutembenuka kwa reaction kumatenga kutentha.
Chitsanzo Funso 3: Kusintha kwa Kugwirizana kwa Kukhazikika
Funso:
Popeza zotsatirazi ndi zofanana:
\[ \text{H}_2\text{(g)} + \text{I}_2\text{(g)} \rightleftharpoons 2\text{HI}\text{(g)} \]
Kodi chimachitika ndi chiyani ngati tiwonjezera H2 yambiri ku dongosolo?
Kukambirana:
Malinga ndi mfundo ya Le Chatelier, ngati kuchuluka kwa chimodzi mwa zinthu zomwe zimayambitsa kusintha kwa zinthu kumawonjezeka, mgwirizanowu umasinthasintha kupita ku chinthu chomwe chimachepetsa kusintha, makamaka ku zinthu zomwe zimapanga.
Pankhaniyi, kuwonjezeka kwa H2 kudzapangitsa kuti mgwirizano usunthire kumanja, kupita ku mapangidwe a HI yambiri.
Chitsanzo Funso 4: Zotsatira za Kuwonjezera Chothandizira pa Kufanana
Funso:
Kodi kuwonjezera kwa catalyst kumakhudza bwanji malo a equilibrium mu equilibrium reaction yotsatirayi?
\[ \text{2SO}_2\text{(g)} + \text{O}_2\text{(g)} \rightleftharpoons 2\text{SO}_3\text{(g)} \]
Kukambirana:
Ma catalyst amawonjezera liwiro la reaction ya forward ndi reverse reactions pochepetsa mphamvu yoyambitsa. Komabe, ma catalyst samakhudza malo a equilibrium; amangothandiza dongosolo kufika pa equilibrium mwachangu. Chifukwa chake, kuwonjezera catalyst sikungasinthe malo a equilibrium.
Chitsanzo Funso 5: Kufanana mu Yankho
Funso:
Popeza momwe asidi wofooka HF m'madzi amachitira ndi ionization reaction:
\[ \text{HF(aq)} \rightleftharpoons \text{H}^+\text{(aq)} + \text{F}^-\text{(aq)} \]
Kodi chimachitika ndi chiyani pa malo ofanana ngati magalamu ochepa a NaF (omwe ali ndi ayoni yonse mu Na+ ndi F-) awonjezeredwa ku yankho la HF?
Kukambirana:
Kuonjezera NaF kudzawonjezera kuchuluka kwa ma F-ion mu yankho. Malinga ndi mfundo ya Le Chatelier, kuwonjezera kuchuluka kwa chinthu (F-) kudzapangitsa kuti equilibrium isunthire kumanzere (zomwe zimapangitsa kuti HF ipangidwe) kuti ichepetse kusintha.
Chitsanzo Funso 6: Kufanana ndi pH
Funso:
Popeza zotsatirazi ndi zofanana:
\[ \text{CO}_2\text{(g)} + \text{H}_2\text{O(l)} \rightleftharpoons \text{H}_2\text{CO}_3\text{(aq)} \]
Kodi kusintha kwa pH ya yankho kumakhudza bwanji mgwirizano?
Kukambirana:
Kuyika kwa H2CO3 m'madzi kumapanga ma H+ ion ndi ma bicarbonate ion (HCO3-):
\[ \text{H}_2\text{CO}_3\text{(aq)} \rightleftharpoons \text{H}^+\text{(aq)} + \text{HCO}_3^-\text{(aq)} \]
Ngati pH ya yankho ichepa (kuchuluka kwa asidi / kuwonjezeka kwa H +), kuchuluka kwa madzi m'thupi kwa CO2 kupita ku H2CO3 kudzasintha kupita ku kuchepa kwa ma H + ion, kutanthauza, kupita ku ma reactants (CO2 ndi H2O). Ngati pH iwonjezeka (yoyambira / kuchepa kwa H +), kuchuluka kwa madzi m'thupi kudzasintha kupita ku zinthu (H2CO3) zomwe zimapanga H + yambiri kuti zibwezeretse kusinthaku.
Kukambirana konseku kwa mgwirizano wa mankhwala kudzawonetsa momwe kusintha kwa kuthamanga kwa magazi, kutentha, kuchuluka kwa madzi, kuwonjezera ma catalyst, ndi momwe yankho limakhudzira malo a mgwirizano, kutsatira mfundo ya Le Chatelier. Kumvetsetsa mfundo imeneyi n'kofunika kwambiri pa ntchito zosiyanasiyana za mankhwala, kuyambira m'mafakitale mpaka kafukufuku wa m'ma laboratories.
Mwa kumvetsetsa mfundo ya kufanana ndi mafunso ndi mafotokozedwe osiyanasiyana, mukuyembekezeka kuzindikira ndikusanthula bwino zochitika zenizeni zokhudzana ndi kufanana m'maphunziro komanso m'njira yothandiza!
