Te Mārama ki ngā Tauhohenga Hanga me te Whakawehe
I roto i te matū, ko te tauhohenga he huringa e uru ana ki ngā matū tīmatanga (ngā matū tauhohenga) ki ngā matū hou (ngā hua). Ka puta noa ēnei huringa i roto i te taiao, i roto rānei i ngā tukanga i hangaia i roto i te taiwhanga, i te ahumahi rānei. I roto i ngā momo tauhohenga matū maha, ko ngā tauhohenga hanga me te pirau kei roto i ngā mea tino taketake me te kōrerohia pinepine. Ka taea te whakaaro he "whakahē" tetahi ki tetahi: ka hangaia e te hanga ngā pūhui mai i ngā matū māmā ake, ko te pirau ka wawahi i ngā pūhui ki ngā matū māmā ake. He mea nui te mārama ki ēnei tauhohenga e rua nā te mea ka whakatakoto i te turanga mō ngā kaupapa whānui pēnei i te stoichiometry, te pūngao tauhohenga, tae noa ki ngā tukanga ahumahi.
Te Mārama ki ngā Tauhohenga Hanganga
Ko te tauhohenga whakahiato (e kiia ana he tauhohenga whakakotahi) he tauhohenga matū e honoa ai ngā matū e rua, neke atu rānei, hei hanga i te hua matua kotahi. I te nuinga o te wā, ka taea te tuhi i tēnei tauhohenga hei whārite māmā:
A + B → AB
Ko te tikanga tēnei ka tauhohe ngā huānga, ngā matū rānei e rua hei hanga i tētahi matū hou. He maha ngā wā ka kitea ngā tauhohenga hanganga i roto i te hanganga o ngā matū kore-waro me ngā matū waro. I roto i te oranga o ia rā, he maha ngā rauemi e whakamahia ana e tātou he hua o ngā tauhohenga hanganga, e puta ana i te taiao me te hangarau ahumahi.
Ngā Āhuatanga o ngā Tauhohenga Hanganga
He maha ngā āhuatanga o ngā tauhohenga hanga e ngāwari ana te mōhio, tae atu ki:
1. He iti iho te nui o te hua i te nui o te matū tauhohe, nā te mea ka hanumi te matū tauhohe.
2. Ka hangaia ngā matū hou, he matatini ake i ngā wāhanga tuatahi.
3. He maha ngā wā ka uru atu ki te tukunga, te mimiti rānei o te pūngao, i runga i te momo hononga i hangaia me ngā āhuatanga tauhohenga.
Ngā Tauira o ngā Tauhohenga Hanganga
Anei ētahi tauira o ngā tauhohenga hanga noa:
1. Te hanganga o te wai
– 2H₂(g) + O₂(g) → 2H₂O(l)
Ka honoa te hauwai me te hāora hei hanga wai. He tauira rongonui tēnei mō te hanga matū.
2. Te hanganga o te konutai pūhaumāota (tote tēpu)
– 2Na(s) + Cl₂(g) → 2NaCl(s)
Ka tauhohe te konutai ki te hau chlorine hei whakaputa tote.
3. Te hanganga o te hauhā waro
– C(s) + O₂(g) → CO₂(g)
Ka tauhohe te waro ki te hāora hei whakaputa i te hauhā waro. Ahakoa e pā ana hoki tēnei ki te tahunga, ka whakarōpūtia hei tauhohenga hangahanga nā te mea ka puta he hua nui kotahi mai i ngā matū tauhohenga e rua.
Ngā Tauhohenga Hanganga i roto i te Ahumahi
He mea tino nui ngā tauhohenga hanga i roto i te ahumahi. Ko tētahi tauira ko te tukanga Haber mō te whakaputa haukini:
– N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
Ko te haukini te rauemi matua mō ngā maniua hauota, he mea nui tēnei ki te whakaputa hua ahuwhenua o ēnei rā. Ki te kore ēnei tauhohenga hanga, ka tino heke te wātea o ngā maniua me ētahi atu matū nui.
Te Mārama ki ngā Tauhohenga Pirau
He rerekē ki te hanga, ko te tauhohenga pirau he tauhohenga e pakaru ai tētahi matū ki ngā matū māmā ake e rua, neke atu rānei. I te nuinga o te wā, ko te whārite tauhohenga ko:
AB → A + B
Ko ēnei tauhohenga e hiahiatia ana te pakaru o ngā hononga matū i roto i ngā matū. Nā te mea he maha ngā wā e hiahiatia ana te pūngao hei pakaru i ngā hononga, he maha ngā tauhohenga pirau ka puta mā te wera (wera), te hiko (irahiko), te mārama rānei (whakaahua).
Ngā Āhuatanga o ngā Tauhohenga Pirau
Ko ētahi o ngā āhuatanga o ngā tauhohenga pirau ko:
1. Ka puta mai i te matū tauhohenga kotahi ētahi hua maha.
2. Ka pakaru te matū ki ngā āhua māmā ake.
3. He maha ngā wā e hiahiatia ana te pūngao o waho hei tīmata i te tauhohenga.
Ngā Momo Tauhohenga Pirau
Ka taea te whakarōpū i ngā tauhohenga pirau i runga i te pūtake pūngao e whakaoho ana i te pirau:
1. Te Pirautanga Wera (wera)
Ka puta te tauhohenga nā te wera. Hei tauira:
– CaCO₃(s) → CaO(s) + CO₂(g)
Ka whakamahanatia te konupūmā kāponāte (kōhatu kōhatu) hei whakaputa i te konupūmā waikura (kohatu kōwhai) me te hauhā waro.
2. Te Whakangaromanga Hikohiko (hiko)
Ka puta te tauhohenga mā te iahiko hiko. Hei tauira:
– 2H₂O(l) → 2H₂(g) + O₂(g)
Ka pakaru te wai hei hauwai me te hāora mā te hikohiko.
3. Te Pirautanga Matū Whakaahua (mārama)
Ka puta te tauhohenga nā te pūngao mārama. Hei tauira:
– 2AgCl(s) → 2Ag(s) + Cl₂(g)
Ka pirau te hiriwa pūhaumāota ina pāngia e te māramatanga, ka puta he hiriwa me te hau pūhaumāota. Koinei te pūtake o te ariā o te whakaahua kiriata tawhito.
Ngā Tauhohenga Pirau i te Oranga o Ia Rā
Kāore ngā tauhohenga pirau e puta noa i te taiwhanga. Hei tauira:
– Te pirau o te hauwai waikura
– 2H₂O₂(aq) → 2H₂O(l) + O₂(g)
Ka taea e te hauwai waikura te pirau ki te wai me te hāora, ka whakatereterehia e te whakamahi i tētahi whakakorikori pērā i te MnO₂.
– Te pirau o ngā mea rauropi
Ko te tukanga pirau o ngā para kai me ngā para rauropi he raupapa o ngā tauhohenga pirau (me te āwhina a ngā moroiti), ka puta he matū māmā ake pēnei i te hau methane, te hauhā waro, me te wai.
Ngā Rerekētanga i waenga i ngā Tauhohenga Hanganga me ngā Tauhohenga Whakangaromanga
Hei whakamārama ake, anei tētahi whakataurite i ngā mea e rua:
1. Te ahunga o te tauhohenga
– Te Hanganga: māmā → uaua ake
– Te wetewete: matatini → māmā ake
2. Te nui o ngā matū tauhohe me ngā hua
– Te Hanganga: he maha ngā matū tauhohe → kotahi te hua matua
– Te pirau: kotahi te matū tauhohenga → maha ngā hua
3. Ngā hiahia pūngao
– Te Hanganga: ka taea te whakaputa wera, te whakaputa wera rānei (i runga i te matū me te hononga)
– Te pirau: he maha ngā wā he endothermic (e hiahiatia ana he pūngao), ahakoa i raro i ētahi āhuatanga ka taea te āwhina e te whakakorikori.
4. Ngā tauira o ngā tauira tauhohenga
– Te Hanganga: A + B → AB
– Te Whakawehenga: AB → A + B
Whakamutunga
Ko ngā tauhohenga hanga me ngā tauhohenga pirau he momo matua e rua o ngā tauhohenga matū, he rerekē ngā tauira o te huringa matū. Ko te tauhohenga hanga ko te tukanga whakakotahi i ngā matū e rua, neke atu rānei, hei hanga i tētahi matū hou, ko te tauhohenga pirau ia ko te tukanga wawahi i tētahi matū kia rua, neke atu rānei, ngā matū māmā ake. He mahi nui tā rāua i roto i te oranga o ia rā, i te pūtaiao, me te ahumahi—mai i te hanganga o te wai me te hanga tongi, ki te wawahi i te kōhatu, te hikohiko o te wai, me te pirau o ētahi matū mā te mārama.
Mā te mārama ki ngā ariā, ngā āhuatanga, me ngā tauira o ngā tauhohenga whakahiato me te wetewete, ka māmā ake tā tātou ako i ngā kaupapa matatau pēnei i ngā whārite tauhohenga, te stoichiometry, ngā pūngao tauhohenga, me ngā tono matū i roto i ngā momo mara. Mēnā e hiahiatia ana, ka taea hoki te whakawhānui ake i tēnei kōrero mā te whakamahi i ngā raruraru mahi, te whakatau i ngā momo tauhohenga mai i ngā whārite matū, te matapaki rānei i te pūngao here me te tūranga o ngā whakakorikori.
