Chii chinonzi Kinetic Chemical Reaction?
Muhupenyu hwedu hwezuva nezuva, tinowanzoona shanduko dzinoita sedziri nyore asi chaizvoizvo dzinosanganisira maitiro akaomarara emakemikari. Simbi inoora, michero inoora, mukaka unoora, uye kunyange kupiswa kwemafuta muinjini yemotokari mienzaniso yemaitiro emakemikari. Zvisinei, mubvunzo mumwe chete unokosha unowanzo buda: sei mamwe maitiro achiitika nekukurumidza, nepo mamwe achinonoka? Mhinduro yemubvunzo uyu inodzidzwa mumakemikari kinetics, bazi rekemikari rinodzidza huwandu hwemaitiro uye zvinhu zvinoapesvedzera. Chinyorwa chino chichakurukura kuti chii chinonzi kinetic chemical reactions, pfungwa dzadzo huru, zvinhu zvinoita basa, uye mashandisirwo azvo muhupenyu.
Kunzwisisa Maitiro eKinetic Chemical
Izwi rekuti "kinetic chemical reaction" rinoreva kudzidza nezvemaitiro emakemikari maererano nekumhanya kwawo (reaction rate). Nemamwe mashoko, maitiro emakemikari ekinetic haasi rudzi rwakasiyana rwekuita, asi maonero ekudzidza maitiro. Chemical kinetics inoedza kupindura mibvunzo yakaita seyi:
– Kukurumidza kwekuita uku kunoitika sei?
- Chii chinosarudza kumhanya kwekuita kwechinhu?
- Maitiro ekuita chiito anoitika sei?
- Ungadzora sei maitiro acho kuti akurumidze kana kuti anonoke?
Mumaindasitiri emakemikari nemishonga, kunzwisisa kinetics kwakakosha pakugadzira maitiro anoshanda, akachengeteka, uye anogadzira zvigadzirwa zvinoenderana.
Mwero weKupindura: Pfungwa Yakakosha yeKinetics
Chiyero chemhinduro chinotsanangurwa sekuchinja kwehuwandu hwe reactant kana chigadzirwa panguva imwe neimwe. Kazhinji, chiyero chemhinduro chinogona kuratidzwa seizvi:
- Kuderera kwehuwandu hwe reactant nekufamba kwenguva
- Kuwedzera kwehuwandu hwezvigadzirwa nekufamba kwenguva
Semuenzaniso, mumhinduro iri nyore:
A → B
Kuwanda kwemhinduro kunogona kuonekwa kubva pakudzikira kwaA kana kuwedzera kwaB. Kana A akadzikira nekukurumidza, zvinoreva kuti huwandu hwemhinduro hwakwira.
Mwero wekuita zvinogona kuyerwa nenzira dzakasiyana-siyana, zvichienderana nerudzi rwekuita. Semuenzaniso:
- Yera huwandu hwegasi rinogadzirwa (kana reaction yacho ichiburitsa gasi)
– Tarisa shanduko dzemavara (maitiro echiratidzo)
- Kuyera pH shanduko
- Kuyera huremu hwechinhu chinodzikira/chinowedzera
- Kushandisa maturusi akakosha akadai se spectrophotometer
Dzidziso yeKuroverana: Sei Kuchinjana Kuchiitika?
Imwe yedzidziso huru mu kinetics idzidziso yekukonana. Dzidziso iyi inoti maitiro emakemikari anoitika nekuti zvikamu zve reactant zvinokonana. Zvisinei, hazvisi zvese zvinokonana zvinoguma nekuita. Kuti kuita kuitike, kukonana kunofanira kusangana nemamiriro maviri:
1. Kuroverana kunobudirira: zvidimbu zvinofanira kuroverana negwara rakakodzera.
2. Simba rakakwana rekuroverana: simba rekuroverana rinofanira kupfuura simba rekuita kuti zvinhu zvishande.
Simba rekuita kuti zvinhu zviite sezviri kuitika (activation energy) ndiro simba shoma rinodiwa kuti zvinhu zviite sezviri kuitika. Kana zvinhu zvinogadzirisa zvinhu zvisina simba rakakwana, zvinongobonderana zvodzokera shure pasina kana chimwe chinhu chakaitika.
Zvinhu Zvinokanganisa Kuwanda Kwemhinduro
Chemical kinetics inoongorora zvinhu zvinogona kukurumidzisa kana kuderedza mashandiro emuviri. Zvinhu zvikuru ndeizvi:
1. Kuwanda kweReactants
Kana huwandu hwezvinhu zvinokonzeresa ma "reactants" hwakakwira, ndipo panowanikwa zvidimbu zvakawanda zvekukonzeresa ma "crank". Nekuda kweizvozvo, kuwanda kwe "crank" kunowedzera uye chiyero che "reaction" chinowanzo wedzera.
Muenzaniso wakapfava: kuita kweasidhi nesimbi kuchakurumidza mumhinduro yeasidhi yakabatana kupfuura mumhinduro yakasanganiswa.
2. Tembiricha
Kuwedzera tembiricha kunoita kuti zvidimbu zvifambe nekukurumidza, zvichiwedzera simba razvo rekufamba. Izvi zvinowedzera mukana wekuti zvidimbu zvive nesimba rinodarika simba rekushanda. Nekuda kweizvozvo, kuroverana kunoshanda zvakanyanya kunoitika uye chiyero chemhinduro chinowedzera.
Ndicho chikonzero nei chikafu chichikurumidza kuora kana chiri mufiriji pane kana chiri mufiriji.
3. Nzvimbo Yepamusoro
Panyaya dzekuita zvinhu zvine simba, nzvimbo yepamusoro inokosha. Kana simba rakatetepa (semuenzaniso, upfu), nzvimbo yacho yepamusoro yakakura, zvichiita kuti ikwanise kusangana nezvimwe zvinokonzeresa simba.
Muenzaniso: huswa hwemuti hunogona kutsva kupfuura huni nekuti nzvimbo yahwo yakakura zvikuru.
4. Chinosimudzira
Chinhu chinobatsira kukurumidza kuita chimwe chinhu pasina kudyiwa nekuita chimwe chinhu. MaCatalyst anoshanda nekupa imwe nzira yekuita chimwe chinhu chine simba shoma rekuita chimwe chinhu. Nesimba shoma rekuita chimwe chinhu, zvidimbu zvakawanda zvinogona kuita chimwe chinhu mumamiriro akafanana.
Mienzaniso yezvinhu zvinokonzeresa matambudziko muhupenyu:
- Ma enzymes mumuviri anokurumidza metabolic reactions
- Chinogadzirisa muutsi hwemotokari (catalytic converter) chinobatsira kushandura magasi ane chepfu kuita magasi akachengeteka
- Chinosimudzira muindasitiri yekugadzira ammonia (maitiro eHaber)
5. Kumanikidzwa (kweMagadzirirwo eGasi)
Mukuita kwegasi, kumanikidzwa kune simba rakafanana nekuisa pfungwa pachinhu chimwe chete. Kuwedzera kumanikidzwa kunodzvanya gasi, zvichiita kuti zvidimbu zvegasi zvibonderane kakawanda. Izvi zvinowedzera mwero wekuita kwechinhu chimwe chete.
6. Hunhu hweZvinhu uye Nzira dzeKuita Nadzo
Chinhu chimwe nechimwe chine hunhu hwakasiyana hwekubatanidza makemikari. Mamwe maitiro anokurumidza zvakasikwa (semuenzaniso, maitiro eionic mumushonga), nepo mamwe achinonoka nekuti anoda kutyorwa kwezvisungo zvakasimba zvecovalent. Uyezve, mhando ye solvent kana reaction medium inokanganisawo kugadzikana kwe reactants nezvigadzirwa.
Mutemo weKuyera uye Mutemo weKuita
Mu kinetics, reaction rate inowanzo gadzirwa muchimiro che rate law, semuenzaniso:
v = k[A]^m[B]^n
Pano:
– v = mwero wekuita
– k = chiyero chisingachinji (chinoenderana nekupisa)
– [A], [B] = kuwanda kwema reactants
– m, n = kurongeka kwekuita kwe reactant yega yega
Huwandu hwe m + n hunonzi odha yekuita zvese. Odha yekuita haisi nguva dzose yakafanana ne ma coefficients ekuita mu chemical equation, nekuti odha yekuita inoonekwa nekuyedza.
Pfungwa yekurongeka kwekuita zvinhu inokosha nekuti inotibatsira kufanotaura kuti shanduko muhuwandu hwezvinhu zvinokanganisa sei mwero wekuita zvinhu.
Maitiro Ekuita Uye Danho Rekuona Mwero
Mamwe maitiro haaitike nedanho rimwe chete riri nyore, asi kuburikidza nematanho akati wandei anonzi maitiro ekuita. Mukati memaitiro aya, pane danho rinononoka, rinonzi danho rekusarudza mwero. Danho iri "rinodzora" kuti maitiro ese anomhanya nekukurumidza sei.
Nekunzwisisa mashandiro acho, masayendisiti anogona kugadzira zvinhu zvinoita kuti zvinhu zviite sezviri nyore kana kuti zvinokurumidza kuita kuti zvinhu zviite sezviri nyore.
Kushandiswa kweKemikari Kinetics muhupenyu
Kudzidziswa kwemakemikari hakusi dzidziso chete, asi kunokosha zvikuru muminda yakawanda:
1. Indasitiri yezvekudya: dzora tembiricha yekuchengetera zvinhu kuti uderedze kupararira kwezvinomera.
2. Pharmacy: kutara zuva rekupera kwemishonga zvichibva pakushaikwa kwemishonga inoshanda.
3. Zvakatipoteredza: kunzwisisa mwero wekusvibiswa kwemhepo kana mvura, kusanganisira kuumbwa kweutsi.
4. Indasitiri yesimba: kugadzirisa kupisa kuti kushande zvakanaka uye kuderedza kusvibiswa kwemhepo.
5. Biology nemishonga: ma enzymes uye nzira dzemetabolism zvinodzidzwa uchishandisa misimboti ye kinetic.
Mhedziso
Kudzidzira kemikari inzira yekudzidza maitiro emakemikari maererano nemwero wawo, mashandiro awo, uye zvinhu zvinopesvedzera kumhanya kwawo. Pfungwa huru mu kinetics dzinosanganisira mwero wekuita, dzidziso yekukanganisika, simba rekuita kuti zvinhu zvishande, mitemo yemwero, kurongeka kwemuitiro, uye basa rema catalysts. Kunzwisisa kinetics kwakakosha pakudzora maitiro, kungave pachikero cherabhoritari, muindasitiri, kana mumaitiro ehupenyu mumuviri. Nemamwe mashoko, kinetics yemakemikari inotibatsira kunzwisisa kwete chete "chinoitika" mukuita, asiwo "kukurumidza uye nei kuchiitika."
Kana muchida, ndinogonawo kugadzira chinyorwa ichi nenzira yesainzi (nemafomula nemienzaniso yekuverenga) kana shanduro iri nyore yevadzidzi vepakati nepasekondari.
