Ngā Tauira o ngā Pātai me ngā Kōrero mō ngā Tauhohenga Redox
He Kupu Whakataki ki ngā Tauhohenga Redox
Ko te tauhohenga redox (whakaiti-waikura) he tauhohenga matū e whakawhitihia ana ngā irahiko i waenga i ngā momo matū e rua. Kei roto i tēnei tauhohenga he huringa i te tau waikura o ngā ngota i roto i te ngota, i te katote, i te pūhui rānei. Ko te kupu "redox" i ahu mai i ngā ariā e rua: te whakaiti me te waikura. Ko te whakaiti te tukanga e heke ai te tau waikura o tētahi matū mā te whiwhi i ngā irahiko. I tetahi atu taha, ko te waikura te tukanga e piki ai te tau waikura o tētahi matū mā te ngaronga o ngā irahiko.
Tauira Pātai 1: Te Tāutu i ngā Tauhohenga Redox
Pātai 1: Whakatauhia te tau waikura o ia huānga i roto i te tauhohenga e whai ake nei, ā, tautuhia ko tēhea te mea kua waikuratia, ko tēhea hoki te mea kua whakaititia.
\[ \text{Zn} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu} \]
Kōrero:
1. Whakatauhia te tau waikura:
– Ko te Zn (Konutea) i te āhua o te konganuku (Zn) he 0 te tau waikura.
– Ko te tau whakapūngao o te Cu²⁺ (katote parahi) he +2.
– Ko te tau whakapūngao o te Zn²⁺ (konutea konutea) he +2.
– Ko te Cu (Parahi) i te āhua o tētahi matū whakarewa, ko tōna tau waikura he 0.
2. Tāutuhia ngā panonitanga o ngā tau waikura:
– Ka huri te Zn mai i te 0 ki te +2, ko te tikanga ka piki ake te tau waikura o te Zn, ā, ka waikura anō hoki te Zn.
– Ka huri te Cu²⁺ mai i te +2 ki te 0, ko te tikanga ka heke te tau waikura o te Cu²⁺, ā, ka heke te Cu²⁺.
Nō reira, he tauhohenga redox te tauhohenga i runga ake nei, e waikuratia ai a Zn, e whakaititia ai hoki a Cu²⁺.
Tauira Pātai 2: Te Whakataurite i ngā Tauhohenga Redox
Pātai 2: Whakatauritea ngā tauhohenga redox e whai ake nei mā te whakamahi i te tikanga haurua-tauhohenga.
\[ \text{MnO}_4^- + \text{Fe}^{2+} \rightarrow \text{Mn}^{2+} + \text{Fe}^{3+} \]
Kōrero:
1. Wehea te tauhohenga kia rua ngā tauhohenga-haurua:
– Te waikura:
\[ \text{Fe}^{2+} \rightarrow \text{Fe}^{3+} \]
– Te Whakaiti:
\[ \text{MnO}_4^- \rightarrow \text{Mn}^{2+} \]
2. Tauritehia ia haurua-tauhohenga mō ngā ngota ehara i te hāora me te hauwai:
– Te Waikura (Fe):
\[ \text{Fe}^{2+} \rightarrow \text{Fe}^{3+} \]
– Whakaitinga (Mn):
\[ \text{MnO}_4^- \rightarrow \text{Mn}^{2+} \]
3. Whakatauritea ngā ngota hāora mā te tāpiri i te H₂O:
– Te Whakaiti:
\[ \text{MnO}_4^- \rightarrow \text{Mn}^{2+} + 4 \text{H}_2\text{O} \]
4. Whakatauritea ngā ngota hauwai mā te tāpiri i te H⁺:
– Te Whakaiti:
\[ \kuputuhi{MnO}_4^- + 8 \kuputuhi{H}^+ \rightarrow \kuputuhi{Mn}^{2+} + 4 \kuputuhi{H}_2\kuputuhi{O} \]
5. Whakatauritea te utu mā te tāpiri i ngā irahiko:
– Te Waikura (Fe):
\[ \text{Fe}^{2+} \rightarrow \text{Fe}^{3+} + \text{e}^- \]
– Whakaitinga (Mn):
\[ \kuputuhi{MnO}_4^- + 8 \kuputuhi{H}^+ + 5 \kuputuhi{e}^- \rightarrow \kuputuhi{Mn}^{2+} + 4 \kuputuhi{H}_2\kuputuhi{O} \]
6. Whakaōritehia te maha o ngā irahiko i roto i ngā haurua-tauhohenga e rua mā te whakarea i ngā haurua-tauhohenga kia ōrite ai te maha o ngā irahiko i ngaro, i whiwhi hoki:
– Te waikura (whakareatia kia 5):
\[ 5 \text{Fe}^{2+} \rightarrow 5 \text{Fe}^{3+} + 5 \text{e}^- \]
– Te Whakaiti:
\[ \kuputuhi{MnO}_4^- + 8 \kuputuhi{H}^+ + 5 \kuputuhi{e}^- \rightarrow \kuputuhi{Mn}^{2+} + 4 \kuputuhi{H}_2\kuputuhi{O} \]
7. Tāpirihia ngā tauhohenga-haurua e rua:
\[ 5 \text{Fe}^{2+} + \text{MnO}_4^- + 8 \text{H}^+ \rightarrow 5 \text{Fe}^{3+} + \text{Mn}^{2+} + 4 \text{H}_2\text{O} \]
8. Tirohia te taurite o ngā ngota me ngā utu:
– Ngā ngota Fe: 5 ki te taha maui, 5 ki te taha matau, he ōrite.
– Ngā ngota Mn: 1 i ngā taha e rua, ōrite.
– Ngā ngota O: 4 i ngā taha e rua, he ōrite.
– Ngā ngota H: 8 i tētahi taha, 8 i tētahi taha, ōrite.
– Utu: 5(+2) + (-1) + 8(+1) = 10 + 8 – 1 = 17 ki te taha maui, me 5(+3) + 2 = 15 + 2 =17 ki te taha matau, he ōrite.
Tauhohenga ōrite:
\[ 5 \text{Fe}^{2+} + \text{MnO}_4^- + 8 \text{H}^+ \rightarrow 5 \text{Fe}^{3+} + \text{Mn}^{2+} + 4 \text{H}_2\text{O} \]
Tauira Pātai 3: Ngā Tauhohenga Redox i te Oranga o Ia Rā
Pātai 3: Whakamāramahia te whai wāhi a ngā tauhohenga redox ki ngā tukanga pākia o te tinana o te tangata.
Kōrero:
He mea nui te mahi a ngā tauhohenga redox i roto i te pākia o te tinana o te tangata, inā koa ko te manawa pūtau. Ko te manawa pūtau te tukanga e whakaputa pūngao ai ngā pūtau o roto i ō tātou tinana i roto i te ahua o te ATP (adenosine triphosphate) mā te wawahi i te hukahuka me ētahi atu ngota waro. Kei roto i tēnei tukanga he raupapa o ngā mahi e uru ana ki ngā tauhohenga redox.
1. Te Glycolysis:
I tēnei wāhanga tuatahi, ka pakaru te hukahuka ki ngā ngota pyruvate e rua. I roto i tēnei tukanga, ka whakaitihia te NAD⁺ (nicotinamide adenine dinucleotide) ki te NADH mā te tango i ngā irahiko i tukuna mai i te hukahuka.
2. Huringa Krebs (Huringa Waikawa Citric):
I tēnei huringa, ka hurihia te pyruvate ki te acetyl CoA, kātahi ka uru ki te huringa Krebs. I roto i te huringa, ka whakaitihia he nui ake te NAD⁺ me te FAD (flavin adenine dinucleotide) ki te NADH me te FADH₂ mā roto i ngā tauhohenga redox, me te whakaputa i ngā ngota ATP.
3. Te Kawe Irahiko:
Ko te NADH me te FADH₂ ka puta mai ka whakamahia i roto i te mekameka kawe irahiko i roto i ngā mitochondria. Ko ngā irahiko e haria ana e te NADH me te FADH₂ ka whakawhitia mā roto i tētahi raupapa o ngā pūmua kaiwhiwhi irahiko. Hei whakamutunga, ka whakamahia ēnei irahiko hei whakaiti i te hāora ki te wai. Ka hangaia e tēnei tukanga he rōnaki proton e whakamahia ana e te ATP synthase hei whakaputa ATP.
Mā roto i tēnei raupapa o ngā tauhohenga, ka hurihia te pūngao e rongoatia ana i roto i ngā hononga matū o ngā ngota kai hei momo pūngao ka taea te whakamahi e ngā pūtau o te tinana. Me whai tauhohenga redox ia wāhanga hei haere tonu i te tukanga pūngao.
Whakamutunga
He mea nui te mahi a ngā tauhohenga redox i roto i ngā horopaki mātauranga me ngā tono mahi o ia rā. Mā te mārama ki te ariā o ngā tauhohenga redox me pēhea te whakataurite i a rātou, ka taea e tātou te kite i ā rātou tono i roto i ngā āhuatanga taiao me ngā hangarau, mai i ngā tauhohenga pākia i roto i ō tātou tinana ki te umanga matū. Ko te tumanako, mā ngā tauira pātai me ngā kōrero i runga ake nei tātou e āwhina ki te mārama me te whakamahi i te ariā o ngā tauhohenga redox i roto i ngā momo kaupapa matū.
