Zitsanzo za Mafunso Okambirana Zinthu Zomwe Zimakhudza Kuchuluka kwa Kuyankha
Kuchitapo kanthu kwa mankhwala ndi kusintha kwa maatomu kapena mamolekyu omwe amadziwika ndi kusintha kwa mphamvu ndi kusintha kwa mphamvu. Mwachizolowezi, liwiro la reaction limafotokoza momwe ma reactants amasinthira mwachangu kukhala zinthu. Zinthu zingapo zimatha kukhudza liwiro la reaction, kuphatikiza kuchuluka, kutentha, kupanikizika (kwa mpweya), malo ozungulira, ndi kupezeka kwa ma catalysts. Nkhaniyi ikambirana za mavuto ena okhudzana ndi zinthu zomwe zimakhudza liwiro la reaction ndi mafotokozedwe atsatanetsatane.
Zinthu Zomwe Zimakhudza Kuchuluka kwa Kuyankha
1. Kuchuluka kwa Ma Reactant
2. Kutentha
3. Kupanikizika
4. Malo Ozungulira
5. Chothandizira
1. Kuchuluka kwa Ma Reactant
Chitsanzo cha Funso 1:
Kuyankha koperekedwa:
A + B → AB
Ngati kuchuluka kwa [A] = 0,5 M ndi [B] = 0,5 M kwaperekedwa, ndipo kuchuluka koyamba kwa reaction kwaperekedwa ndi kuchuluka = k[A][B]. Kodi kuchuluka kwa reaction kudzakhala kotani ngati kuchuluka kwa A kwawirikiza kawiri kufika pa 1 M pomwe [B] kukhalabe pa 0,5 M?
Kukambirana:
Fomula ya kuchuluka kwa zomwe zimachitika:
\[ \text{Rate} = k[A][B] \]
Mtengo woyambira:
\[ \text{Rate}_{\text{initial}} = k[0,5][0,5] = 0,25k \]
Pamene kuchuluka kwa A kukukhala 1 M:
\[ \text{Rate}_{\text{new}} = k[1][0,5] = 0,5k \]
Kuyerekeza mitengo:
\[ \frac{\text{Rate}_{\text{new}}}{\text{Rate}_{\text{initial}}} = \frac{0,5k}{0,25k} = 2 \]
Kotero, chiŵerengero chatsopano cha zochita chili kawiri kuposa chiŵerengero choyamba cha zochita.
2. Kutentha
Chitsanzo cha Funso 2:
Katswiri wa sayansi ya zamankhwala akunena kuti kuchuluka kwa momwe zinthu zimachitikira pakachitika mankhwala kumawonjezeka kuchoka pa 0,5 mol/L/s kufika pa 2 mol/L/s pamene kutentha kukukwera kuchoka pa 300 K kufika pa 320 K. Kodi chinthu chowonjezera ndi chiyani, chozikidwa pa lamulo la Arrhenius?
Kukambirana:
Lamulo la Arrhenius limati:
\[ \text{Rate} = Ae^{-\frac{E_a}{RT}} \]
Kuwonjezeka kwa kutentha kumapangitsa kuti exponential ichepe mu Arrhenius expression, kotero kuti reaction rate imawonjezeka. Pankhaniyi, kuwonjezeka kwa chinthu ndi:
\[ \frac{\text{Rate}\ \text{at}\ 320\ K}{\text{Rate}\ \text{at}\ 300\ K} = \frac{2\ mol/L/s}{0,5\ mol/L/s} = 4 \]
Chifukwa chake, kuchuluka kwa kuchuluka kwa reaction rate ndi nthawi 4.
3. Kupanikizika
Chitsanzo cha Funso 3:
Ponena za momwe mpweya umayendera:
\[ \lemba{2NO}(g) + \mawu{O}_2(g) → \mawu{2NO}_2(g) \]
Ngati kupanikizika konse kwawonjezeka kuchoka pa 1 atm kufika pa 2 atm ndi voliyumu yosasintha, kodi izi zidzakhudza bwanji kuchuluka kwa zomwe zimachitika?
Kukambirana:
Mu mpweya woipa, kupanikizika kumagwirizana mwachindunji ndi kuchuluka kwa mpweya. Kuonjezera kupanikizika kumawonjezera kuchuluka kwa mpweya uliwonse, zomwe zimapangitsa kuti kuchuluka kwa mpweyawo kuchuluke. Poganiza kuti kupanikizika kumasungidwa mofanana, kuchuluka kwa mpweyawo kumawonjezeka ndi kupanikizika:
\[ \text{Rate}_{\text{new}} = k[2NO]^2[O_2] \]
Pakuwonjezeka kwa kupanikizika, kuchuluka kwa NO ndi O2 kudzawirikiza kawiri, kotero kuchuluka kwa zomwe zimachitika kudzawonjezeka ndi:
\[ \text{Rate}_{\text{new}} = k[2NO]^2[2O_2] = k(2[NO])^2 (2[O_2]) = 4k[NO]^2[O_2] \]
Kotero chiwerengero cha zochita chimawonjezeka ndi nthawi 4.
4. Malo Ozungulira
Chitsanzo cha Funso 4:
Zn yolimba ikayikidwa mu yankho la HCl, zomwe zimachitika popanga mpweya wa H2 zimachitika mwachangu kwambiri Zn ikaphwanyidwa kukhala ufa kuposa momwe imakhalira ngati Zn bar. Chifukwa chiyani zili choncho?
Kukambirana:
Kuchulukitsa malo pamwamba pa tinthu tolimba kumawonjezera kuchuluka kwa mamolekyu atsopano omwe amatha kugundana ndi pamwamba pa Zn yolimba. Kachitidwe pakati pa Zn ndi HCl ndi:
\[ \text{Zn}(s) + 2\text{HCl}(aq) → \text{ZnCl}_2(aq) + \text{H}_2(g) \]
Zn ikakhala mu mawonekedwe a ufa, malo olumikizirana pakati pa Zn ndi HCl amakhala akulu poyerekeza ndi Zn mu mawonekedwe a bar, motero amawonjezera kuchuluka kwa reaction kudzera m'malo ambiri ogundana.
5. Chothandizira
Chitsanzo cha Funso 5:
Fotokozani kusiyana kwa kuchuluka kwa momwe hydrogen peroxide imagwirira ntchito powonongeka ndi chothandizira komanso chopanda (Manganese dioxide, MnO2).
\[ \mawu{2H}_2\mawu{O}_2(aq) → 2\mawu{H}_2\mawu{O}(l) + \mawu{O}_2(g) \]
Kukambirana:
Popanda chothandizira, kuwonongeka kwa hydrogen peroxide kumakhala pang'onopang'ono chifukwa cha mphamvu yayikulu yoyambitsa. Komabe, ndi chothandizira cha MnO2, mphamvu yoyambitsa imachepa kwambiri. MnO2 sichitapo kanthu kosatha mu reaction, koma m'malo mwake imapereka njira ina (reaction mechanism) yokhala ndi mphamvu yochepa yoyambitsa, zomwe zimapangitsa kuti reaction ichitike mwachangu.
Ndi chothandizira:
- Chiŵerengero cha zochita chimawonjezeka chifukwa mphamvu zomwe zimafunika zimakhala zochepa.
– Kayendedwe ka zochita kamasintha koma phindu la zinthu limapitirirabe kukhala lomwelo.
Ma Catalyst amalola kuchuluka kwa kugundana kogwira mtima kuti kuwonjezereke popanda kusintha thermodynamics ya reaction.
Mapeto
Kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya kumakhudzidwa ndi zinthu zingapo, kuphatikizapo kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya, kutentha, kupanikizika, makamaka mu kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya, malo ozungulira zinthu zolimba, komanso kupezeka kwa zinthu zomwe zimathandizira kusinthasintha kwa mpweya. Kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya kumayenderana mwachindunji ndi kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya; kupanikizika kumakhudza kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya; malo ozungulira amakhudza malo ogundana; ndipo zinthu zomwe zimathandizira kusinthasintha kwa mpweya zimathandizira kusinthasintha kwa mpweya pochepetsa mphamvu yogwirira ntchito. Kumvetsetsa zinthuzi ndikofunikira kwambiri powongolera kuchuluka kwa zinthu zomwe zimachitika chifukwa cha kusinthasintha kwa mpweya m'mafakitale osiyanasiyana komanso kafukufuku wa labotale.
