ʻOkika a me ka Hoʻēmi ʻana: Nā Kumu o nā Hana Kemika
ʻO ka oxidation a me ka reduction ʻelua mau manaʻo nui i ka kemika e hele pinepine pū ana. He mea koʻikoʻi kēia mau loli kemika e pili ana i ka neʻe ʻana o nā electrons i nā ʻano hana kūlohelohe a me nā ʻoihana like ʻole, me ka hanu ʻana o ke kelepona, ka puhi ʻana i ka wahie, a me nā hopena electrochemical i loko o nā pila. E wehewehe kēia ʻatikala i nā wehewehena, ka mōʻaukala, nā ʻano hana, a me nā noi o ka oxidation a me ka reduction ma ke ʻano piha akā hiki ke maʻalahi.
Ka Wehewehena o ka Oxidation a me ka Reduction
I ka ʻōlelo maʻalahi, pili ka oxidation i ka nalowale o nā electrons e kahi mole, atom, a i ʻole ion. I ka ʻaoʻao ʻē aʻe, ʻo ka hōʻemi ka loaʻa ʻana o nā electrons e kahi mole, atom, a i ʻole ion. Hoʻopōkole pinepine ʻia kēia wehewehe ʻana i "OIL RIG": ʻO ka Oxidation ka Pohō, ʻO ka Reduction ka Loaʻa.
ʻOkika:
\[
\kikokikona{A} \rightarrow \kikokikona{A}^{+} + e^{-}
\]
Hoʻemi:
\[
\kikokikona{B} + e^{-} \rightarrow \kikokikona{B}^{-}
\]
I nā hopena oxidation-reduction (redox), aia mau ʻelua mau ʻāpana: kahi oxidizing agent a me kahi reducing agent. ʻO ka oxidizing agent kahi mea e ʻae i nā electrons a hana i ka reduction, ʻoiai ʻo ka reducing agent kahi mea e nalowale nā electrons a hana i ka oxidation.
Moʻolelo o ka Hoʻomohala Manaʻo
Ua hoʻopaʻa ʻia e ka mōʻaukala ua hoʻolauna mua ʻia ke kumumanaʻo o ka oxidation i ke kenekulia 18 e ka ʻepekema Farani ʻo Antoine Lavoisier. Ua ʻike ʻo Lavoisier i ka wā e hana ai nā metala me ka oxygen, hana lākou i nā "oxides." ʻO kēia ke kumu o ka huaʻōlelo "oxidation." Eia naʻe, ua hoʻokumu hou ʻia ke kumumanaʻo o ka hōʻemi a me kona pilina me ka oxidation e nā ʻepekema e like me Humphry Davy lāua ʻo Michael Faraday i ke kenekulia 19.
I ka makahiki 1834, ua wehewehe ʻo Faraday e hoʻopuka nā hopena electrochemical i loko o nā cell voltaic i nā au uila i hoʻokumu ʻia e ka neʻe ʻana o nā electrons. Ua kōkua kēia haʻawina i ka hoʻomaopopo ʻana i ke kuleana o nā electrons i nā hopena redox.
Nā ʻAno Hana a me nā Kumumanaʻo Kumu
ʻO ka hopena redox he ʻelua mau hopena hapalua: kahi hopena hapalua oxidation a me kahi hopena hapalua hōʻemi. E noʻonoʻo kākou i kahi laʻana maʻamau: ka hopena ma waena o ka zinc (Zn) a me nā ion keleawe (II) (Cu^{2+}) i loko o ka hopena wai.
Hana Hapalua ʻOkika:
\[
\kikokikona{Zn} \rightarrow \kikokikona{Zn}^{2+} + 2e^{-}
\]
Ka Hoʻemi ʻana i ka Hapalua Hana:
\[
\text{Cu}^{2+} + 2e^{-} \arrow \text{Cu}
\]
Ke hui pū ʻia kēia mau hapalua hapalua, loaʻa iā mākou ka hopena redox piha:
\[
\kikokikona{Zn} + \kikokikona{Cu}^{2+} \rightarrow \kikokikona{Zn}^{2+} + \kikokikona{Cu}
\]
Ma kēia hopena, hana ka zinc (Zn) ma ke ʻano he mea hoʻemi no ka mea hāʻawi ia i nā electrons, ʻoiai ʻo nā ion keleawe (Cu^{2+}) e hana ma ke ʻano he mea hoʻomake oxidizing no ka mea ʻae lākou i nā electrons.
Hoʻomalu ʻia nā hopena redox e nā kumumanaʻo o ka mālama ʻana i ka nuipa a me ka mālama ʻana i ka uku uila. ʻO ke ʻano kēia, i loko o kahi hopena kemika, pono e mau ka helu holoʻokoʻa o nā ʻātoma a me ka uku.
Nā Hoʻohana i ke Ola o kēlā me kēia Lā
He mea nui nā hopena Redox i nā ʻano like ʻole o ke ola o kēlā me kēia lā a me ka ʻoihana:
1. Hanu ʻana o ke Kelepona: I loko o nā meaola ola, ʻo ka hanu ʻana o ke kelepona kahi hana redox kahi e hoʻoheheʻe ʻia ai ka glucose e hana i ka ikehu ma ke ʻano o ATP. Hana ka oxygen a mākou e hanu ai ma ke ʻano he mea hoʻoheheʻe, ʻoiai ʻo ka glucose e hana ma ke ʻano he mea hoʻemi.
2. Ka pala: ʻO ke kaʻina hana oxidation ke kumu o ka pala, kahi e hana ai nā metala e like me ka hao (Fe) me ka oxygen a me ka wai e hana i nā oxides e like me ka rust (Fe_2O_3).
3. Nā Pila a me nā Kelepona Wahie: I loko o nā pila, hana nā electrodes i nā hopena redox e hoʻololi i ka ikehu kemika i ikehu uila. No ka laʻana, i loko o nā pila lithium-ion, he kuleana ko nā ion lithium i ka hoʻoili ʻana o nā electrons ma waena o nā electrodes maikaʻi a me nā electrodes maikaʻi ʻole ma o nā hopena redox.
4. Photosynthesis: I loko o ke ao o nā mea kanu, ʻo ka photosynthesis kahi hana redox kahi e hoʻopau ai ka chlorophyll i ka wai e hana i ka oxygen a hoʻemi i ke kalapona dioxide i glucose ma lalo o ka mana o ka lā.
5. Ka Hoʻomaʻemaʻe ʻana i nā Metala: I loko o ka ʻoihana metallurgical, ʻo ka unuhi ʻana o nā metala mai kā lākou mau ores e pili ana i nā hopena redox. No ka laʻana, unuhi ʻia ka alumini ma o ka electrolysis mai alumina (Al_2O_3), kahi e hana ai nā ion alumini i ka hoʻemi ʻana e hana i ka metala alumini maʻemaʻe.
6. Ka Hoʻomaʻemaʻe Wai: ʻO ke kaʻina hana o ka hoʻomaʻemaʻe wai me ka hoʻohana ʻana i ka chlorine e pili ana i kahi hopena redox kahi e hana ai ka chlorine ma ke ʻano he mea hoʻomake oxidizing e pepehi ai i nā microorganism pathogenic.
Ka paʻakikī o ka Oxidation a me ka Reduction
ʻOiai he maʻalahi loa nā kumumanaʻo kumu o ka oxidation a me ka reduction, i ka hana maoli, hiki i nā hopena redox ke paʻakikī loa. ʻO kēia no ka mea he nui nā hopena kemika e pili ana i ʻelua ʻano o nā ʻātoma a i ʻole nā molekala, a hiki i nā kūlana kaiapuni e like me ka pH a me ka mahana ke hoʻopilikia i kēia mau hopena.
ʻO ka Electrochemistry kekahi kahua e hoʻopuni ana i kēia paʻakikī, kahi e hoʻohana ʻia ai nā hopena redox e hana i ka uila a i ʻole e hoʻolalelale ʻia e kahi au uila. ʻO kahi cell voltaic kahi laʻana maʻalahi o kahi noi electrochemical kahi e hana ai ka spontaneity o kahi hopena redox i kahi au uila. ʻO nā cell electrolytic, ma ka ʻaoʻao ʻē aʻe, hoʻohana i ka uila e koi i kahi hopena redox ʻaʻole spontaneous e hana.
Kūlana ma ka Mālama Kaiapuni
ʻAʻole wale nā hana redox he mea nui i nā ʻano ʻenehana a me nā ʻoihana, akā he mau hopena nui hoʻi no ka palekana o ke kaiapuni. Eia kekahi laʻana:
– Ka Hana ʻŌpala: Hoʻokomo pinepine nā kaʻina hana mālama ʻōpala i nā hopena redox e hōʻemi i ka ʻawahia o nā mea haumia organik a me inorganic.
– Hoʻēmi ʻana i ka hoʻokuʻu ʻana: Pili ka ʻenehana hoʻomaʻemaʻe kinoea hoʻopau i nā hopena redox e hoʻololi i nā mea haumia ʻino e like me ka nitrogen oxides (NOx) a me ka sulfur dioxide (SO2) i nā ʻano i emi iki ka ʻino.
– Photocatalysis: Hoʻohana ka ʻenehana Photocatalysis i nā semiconductors e like me ka titanium dioxide (TiO2) e hoʻokaʻawale i nā mea haumia organik ma lalo o ka mana o ke kukui UV ma o nā hopena redox.
Ka hopena
ʻElua ʻaoʻao o ke kālā hoʻokahi ka oxidation a me ka reduction i loko o ke kemika kumu. Hoʻokumu lākou i ke kumu o nā hopena kemika he nui i mea nui i ke ola a me ka ʻenehana. Mai ka hanu ʻana o ke kelepona a hiki i ka ʻenehana pila e hoʻoikaika ai i kā mākou mau mea uila, hāʻawi nā hopena redox i nā ʻike hohonu i ke ʻano o ka launa pū ʻana o nā molekala a me ka loli. ʻO ka hoʻomaopopo hohonu ʻana i kēia mau ʻano hana ʻaʻole wale ia he mea nui no nā kānaka ʻepekema a me nā ʻenekinia akā kōkua pū kekahi iā mākou e mahalo a pale i ke kaiapuni a mākou e noho nei.
I ka hoʻomau ʻana o ka ʻenehana a me ka ʻike i ka kemika i ka holomua, hiki iā mākou ke manaʻo e ʻike i nā noi a me nā hana hou aʻe e pili ana i nā kumumanaʻo o ka oxidation a me ka reduction. Ma o ka hoʻonaʻauao mau ʻana a me ka noiʻi, hiki iā mākou ke hoʻonui i nā pono o nā hopena redox no ka holomua o ke kanaka.
