{"id":53917,"date":"2021-08-25T09:00:00","date_gmt":"2021-08-25T12:00:00","guid":{"rendered":"https:\/\/blog.estrategiavestibulares.com.br\/?p=53917"},"modified":"2024-02-20T15:34:46","modified_gmt":"2024-02-20T18:34:46","slug":"eletroquimica-no-enem","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/eletroquimica-no-enem\/","title":{"rendered":"O que cai sobre Eletroqu\u00edmica no Enem?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A compreens&atilde;o das rea&ccedil;&otilde;es qu&iacute;micas &eacute; essencial para a aprendizagem pr&eacute;-<span id=\"urn:enhancement-e8013b3d-47cc-44da-a955-f2fd0bedac18\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/vestibular\">vestibular<\/span>. O tema <span id=\"urn:enhancement-20a9c194-c758-4b52-8fb4-343dfc37a45c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletroquimica\">eletroqu&iacute;mica<\/span>, por exemplo, &eacute; muito comum no <span id=\"urn:enhancement-5cae6f5a-1ad7-4953-9204-33073dc4f430\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span> em assuntos como no&ccedil;&otilde;es de oxida&ccedil;&atilde;o e redu&ccedil;&atilde;o, pilhas e baterias, &acirc;nodos e c&aacute;todos.<p class=\"wp-block-paragraph\">Para te ajudar com o assunto, o Estrat&eacute;gia Vestibulares preparou um artigo com as principais informa&ccedil;&otilde;es sobre <span id=\"urn:enhancement-49dfaf2f-e633-432a-8f4d-67507211a895\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletroquimica\">Eletroqu&iacute;mica<\/span> e como ela aparece no <span id=\"urn:enhancement-7975a3f3-2a19-461a-bc9b-48da17b1aaa0\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span>, com quest&otilde;es e temas mais recorrentes. Confira!<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Navegue pelo conte\u00fado<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/eletroquimica-no-enem\/#Eletroquimica-o-que-e\" >Eletroqu&iacute;mica o que &eacute;?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/eletroquimica-no-enem\/#Como-e-cobrada-Eletroquimica-no-Enem\" >Como &eacute; cobrada Eletroqu&iacute;mica no Enem?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/eletroquimica-no-enem\/#Principais-questoes-sobre-Eletroquimica-no-Enem\" >Principais quest&otilde;es sobre Eletroqu&iacute;mica no Enem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/eletroquimica-no-enem\/#Veja-tambem\" >Veja tamb&eacute;m:<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-eletroquimica-o-que-e\"><span class=\"ez-toc-section\" id=\"Eletroquimica-o-que-e\"><\/span>Eletroqu&iacute;mica o que &eacute;?<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-c6434310-10cc-4599-b3eb-1c859b2dfd1b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletroquimica\">eletroqu&iacute;mica<\/span> &eacute; um ramo da <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/category\/quimica\/\" target=\"_blank\">qu&iacute;mica <\/a>que estuda a<strong> <\/strong>intera&ccedil;&atilde;o entre <span id=\"urn:enhancement-a2ab6ac3-d2fb-4813-bebf-1d9b6b8ec773\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncias<\/span> por meio de seu<strong> <span id=\"urn:enhancement-b90ac6e1-b01d-41da-9b76-e97a2f80364a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">potencial de redu&ccedil;&atilde;o<\/span>-oxida&ccedil;&atilde;o<\/strong>. Nessas rea&ccedil;&otilde;es ocorre a <strong>transfer&ecirc;ncia de el&eacute;trons entre os compostos<\/strong> e a <strong><span id=\"urn:enhancement-b6560d94-427f-48fa-b279-5671a2f04552\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> <span id=\"urn:enhancement-38a383fd-0c6b-4f85-930a-be4d802d9a2b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> &eacute; convertida em <span id=\"urn:enhancement-745ebd40-6e1a-463e-8f6c-7fa90cfa56b0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia-eletrica\">energia el&eacute;trica<\/span><\/strong> ou vice-versa<strong>.&nbsp;<\/strong><\/p><p class=\"wp-block-paragraph\">Para compreender os processos eletroqu&iacute;micos &eacute; importante conhecer o conceito de NOX &mdash; essa sigla representa o <strong><span id=\"urn:enhancement-7c48a909-3b41-40ce-a26d-2250126b4085\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span> de uma <span id=\"urn:enhancement-a82e592a-588e-41fc-ad57-19400f7bec15\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncia<\/span>.<\/strong> Esse valor indica a quantidade de el&eacute;trons a mais ou a menos em um &aacute;tomo , conforme a intera&ccedil;&atilde;o <span id=\"urn:enhancement-5cf67d61-9f01-4884-aad4-90d775eb19ee\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> que estabelece.&nbsp;<\/p><p class=\"wp-block-paragraph\">Um <strong>NOX positivo<\/strong> demonstra que o &aacute;tomo cont&eacute;m<strong> el&eacute;trons a menos que o ideal<\/strong>. Por sua vez, o <strong>NOX negativo<\/strong> aponta para um n&uacute;mero de<strong> el&eacute;trons a mais que o normal<\/strong>.<\/p><p class=\"wp-block-paragraph\">&Eacute;<strong> por meio do <span id=\"urn:enhancement-06594511-dece-4237-a5a8-62445fc3ea5a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">Nox<\/span> que se pode compreender a permuta de el&eacute;trons <\/strong>entre os compostos e ent&atilde;o notar a <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/oxirreducao\/\" target=\"_blank\">oxirredu&ccedil;&atilde;o<\/a> que acontece na rea&ccedil;&atilde;o!<\/p><h2 class=\"wp-block-heading\" id=\"h-como-e-cobrada-eletroquimica-no-enem\"><span class=\"ez-toc-section\" id=\"Como-e-cobrada-Eletroquimica-no-Enem\"><\/span>Como &eacute; cobrada Eletroqu&iacute;mica no Enem?<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Agora que voc&ecirc; j&aacute; conhece a defini&ccedil;&atilde;o de <span id=\"urn:enhancement-15a7b351-dde5-45f2-9451-365732e7c5df\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletroquimica\">eletroqu&iacute;mica<\/span> e as no&ccedil;&otilde;es b&aacute;sicas necess&aacute;rias, veja quais s&atilde;o os aspectos do assunto mais cobrados no <span id=\"urn:enhancement-bf6e62a0-2deb-476e-b40d-fce3e5f6540b\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span>:<\/p><h3 class=\"wp-block-heading\" id=\"h-oxidacao-e-reducao\">Oxida&ccedil;&atilde;o e redu&ccedil;&atilde;o<\/h3><ul class=\"wp-block-list\">\n<li><strong>Oxida&ccedil;&atilde;o: <\/strong>ocorre quando o &aacute;tomo perde el&eacute;trons na rea&ccedil;&atilde;o, assim o NOX aumenta;<\/li>\n\n\n\n<li><strong>Redu&ccedil;&atilde;o: <\/strong>acontece quando um &aacute;tomo ganha el&eacute;trons na intera&ccedil;&atilde;o qu&iacute;mica, com diminui&ccedil;&atilde;o do <span id=\"urn:enhancement-d3768448-8538-4789-b8f9-0ab174f5ff5c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span>;<\/li>\n\n\n\n<li><strong>Agente redutor: <\/strong>subst&acirc;ncia ou &aacute;tomo que oxidou e que resulta na oxida&ccedil;&atilde;o da outro composto da rea&ccedil;&atilde;o;&nbsp;<\/li>\n\n\n\n<li><strong>Agente oxidante:<\/strong> aquela subst&acirc;ncia ou &aacute;tomo que foi reduzida na rea&ccedil;&atilde;o e causou a redu&ccedil;&atilde;o de outro composto;&nbsp;&nbsp;<\/li>\n\n\n\n<li><strong><span id=\"urn:enhancement-ce6a2e1f-bb5a-438e-915f-0f4b0d6fbc26\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">Potencial de redu&ccedil;&atilde;o<\/span>:<\/strong> n&uacute;mero que mede a capacidade de uma subst&acirc;ncia em sofrer redu&ccedil;&atilde;o &mdash; quanto maior, mais possibilidade de diminuir o NOX na rea&ccedil;&atilde;o;<\/li>\n\n\n\n<li><strong><span id=\"urn:enhancement-6f49b1db-8783-4d6e-9a69-618bde0399d2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">Potencial de oxida&ccedil;&atilde;o<\/span>: <\/strong>valor que dimensiona a possibilidade de uma subst&acirc;ncia em ser oxidada &mdash; quanto maior esse n&uacute;mero, mais chance do NOX aumentar.&nbsp;<\/li>\n<\/ul><p class=\"wp-block-paragraph\">Por &uacute;ltimo, perceba que <strong>quanto maior o <span id=\"urn:enhancement-99ff3a10-ae13-45b9-9c36-7ef8f661bae2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">potencial de redu&ccedil;&atilde;o<\/span><\/strong> de um composto, <strong>menor seu <span id=\"urn:enhancement-f3844cdf-c160-4f1c-8309-c6f1708d0868\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">potencial de oxida&ccedil;&atilde;o<\/span><\/strong> e vice-versa<strong>,<\/strong> visto que os dois conceitos s&atilde;o antag&ocirc;nicos.<\/p><h3 class=\"wp-block-heading\" id=\"h-principais-agentes-oxidantes\">Principais agentes oxidantes<\/h3><p class=\"wp-block-paragraph\">Como citado anteriormente, os <strong>agentes oxidantes s&atilde;o <span id=\"urn:enhancement-a8f99db6-7ca4-49ca-9f08-e5da04d9826a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncias<\/span> que sofrem redu&ccedil;&atilde;o<\/strong> e <strong>ocasionam a oxida&ccedil;&atilde;o de outros compostos<\/strong> da rea&ccedil;&atilde;o.&nbsp;<\/p><p class=\"wp-block-paragraph\">Veja, para que sejam reduzidos, os agentes oxidantes devem apresentar <strong>alto <span id=\"urn:enhancement-724eb501-c898-4207-8774-7e98846f3ce1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">potencial de redu&ccedil;&atilde;o<\/span>.&nbsp;<\/strong><\/p><p class=\"wp-block-paragraph\">Como uma mesma <span id=\"urn:enhancement-78dceeb2-d7d7-462e-80fe-2ed139bd96d3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncia<\/span> pode mostrar-se oxidante e redutora conforme as diferentes rea&ccedil;&otilde;es,n&atilde;o existe um padr&atilde;o fixo determinado. Entretanto, alguns compostos t&ecirc;m alto potencial oxidante na maior parte dos casos, como o <strong>permanganato de Pot&aacute;ssio (KMnO&#8324;) , o <span id=\"urn:enhancement-2f588349-ccbd-4044-9fe2-f5feaf42d7f8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/peroxido-de-hidrogenio\">per&oacute;xido de Hidrog&ecirc;nio<\/span> (H<\/strong><strong><sub>2<\/sub><\/strong><strong>O<\/strong><strong><sub>2<\/sub><\/strong><strong>), o &aacute;cido n&iacute;trico (HNO<\/strong><strong><sub>3<\/sub><\/strong><strong>) e o dicromato de pot&aacute;ssio (K&#8322;Cr&#8322;O&#8327;).<\/strong><\/p><h3 class=\"wp-block-heading\" id=\"h-pilhas-e-baterias\">Pilhas e baterias<\/h3><p class=\"wp-block-paragraph\">Pilhas e baterias s&atilde;o dispositivos que convertem <span id=\"urn:enhancement-70870216-55e3-4de5-89ef-7d0a8c8fe9bf\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> <span id=\"urn:enhancement-63a8e621-89ba-40be-b0c5-1976b01ed6f9\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> em el&eacute;trica por meio de <span id=\"urn:enhancement-3d2a448d-54f7-476b-84ab-4c0fe7537b6d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reacoes-de-oxirreducao\">rea&ccedil;&otilde;es de oxirredu&ccedil;&atilde;o<\/span>. Por meio da <strong>intera&ccedil;&atilde;o entre &acirc;nodos e c&aacute;todos<\/strong>, al&eacute;m de uma <strong>solu&ccedil;&atilde;o condutora de &iacute;ons<\/strong> ocorre&nbsp; a transfer&ecirc;ncia de el&eacute;trons entre os materiais e, por fim, a<strong> forma&ccedil;&atilde;o de <span id=\"urn:enhancement-d06a6d8f-5d4d-4c88-94e8-7106ec30ef8f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletricidade\">eletricidade<\/span><\/strong>.&nbsp;<\/p><p class=\"wp-block-paragraph\">&Eacute; importante recordar que pilhas s&atilde;o formadas por dois eletrodos (um &acirc;nodo e um c&aacute;todo), e baterias s&atilde;o associa&ccedil;&otilde;es de v&aacute;rias pilhas em s&eacute;rie ou paralelo (v&aacute;rios eletrodos e maior voltagem total).<\/p><h3 class=\"wp-block-heading\" id=\"h-anodo-e-catodo\">&Acirc;nodo e c&aacute;todo<\/h3><p class=\"wp-block-paragraph\">Um eletrodo (ou polo) &eacute; composto de um &acirc;nodo e um c&aacute;todo, que podem ser definidos como:<\/p><ul class=\"wp-block-list\">\n<li><strong>&Acirc;nodo<\/strong>:&nbsp; composto que est&aacute; no <strong>p&oacute;lo negativo da pilha <\/strong>e que &eacute; oxidado, sofrendo corros&atilde;o &mdash; possui o <strong>menor <span id=\"urn:enhancement-99ca158b-889f-4dd4-bb25-de977d616e15\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">potencial de redu&ccedil;&atilde;o<\/span><\/strong>; e&nbsp;<\/li>\n\n\n\n<li><strong>C&aacute;todo: <\/strong>material que representa o <strong>p&oacute;lo positivo de uma pilha<\/strong> e sofre deposi&ccedil;&atilde;o com aumento de massa total &mdash; o <strong>maior <span id=\"urn:enhancement-8e14cf34-3282-4b33-9abc-ce58c39906bd\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/potencial-de-oxidacao\">potencial de redu&ccedil;&atilde;o<\/span><\/strong>.&nbsp;<\/li>\n<\/ul><h3 class=\"wp-block-heading\" id=\"h-potencial-padrao-de-reducao-das-pilhas\">Potencial padr&atilde;o de redu&ccedil;&atilde;o das pilhas<\/h3><p class=\"wp-block-paragraph\">O potencial padr&atilde;o de redu&ccedil;&atilde;o em pilhas &eacute; a rela&ccedil;&atilde;o entre os potenciais de cada eletrodo. Para calcular a voltagem desse tipo de dispositivo, ent&atilde;o, &eacute; preciso realizar o seguinte c&aacute;lculo:<\/p><p class=\"has-text-align-center wp-block-paragraph\"><strong>&Delta;E = E<\/strong><strong><sub>red<\/sub><\/strong><strong> (maior) &ndash; E<\/strong><strong><sub>red<\/sub><\/strong><strong> (menor)<\/strong><\/p><p class=\"wp-block-paragraph\">Com isso, consegue-se o valor da intera&ccedil;&atilde;o entre os eletrodos, chamado de varia&ccedil;&atilde;o do potencial de uma pilha &Delta;E.&nbsp;<br>Al&eacute;m disso, a <span id=\"urn:enhancement-f8611e4a-5898-4d47-b5e9-270a67b8e2ce\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> demonstra que <strong>&nbsp;o &Delta;E de uma pilha &eacute; sempre positivo!<\/strong><\/p><h3 class=\"wp-block-heading\" id=\"h-eletrolise-ignea-e-eletrolise-em-meio-aquoso\">Eletr&oacute;lise &iacute;gnea e eletr&oacute;lise em meio aquoso<\/h3><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-9ffb8f93-aaae-4309-9b75-ad42cfafd1cb\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletrolise\">eletr&oacute;lise<\/span>, por sua vez, &eacute; a gera&ccedil;&atilde;o de <span id=\"urn:enhancement-875fd65c-5442-4581-88fa-664f8506ac95\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> <span id=\"urn:enhancement-c94d5851-296e-466c-b4e3-4ea1ecacb79d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> a partir de <span id=\"urn:enhancement-0ee92cef-36ba-486a-aeed-a476d061c211\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia-eletrica\">energia el&eacute;trica<\/span> a partir de uma rea&ccedil;&atilde;o n&atilde;o espont&acirc;nea &ndash; por isso o <strong>&Delta;E de um dispositivo eletrol&iacute;tico &eacute; sempre negativo<\/strong>. Esse processo pode acontecer em <strong>ambiente aquoso (<span id=\"urn:enhancement-c806d511-2375-4430-8f5b-1b49da03833e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletrolise\">eletr&oacute;lise<\/span> aquosa) ou em uma <span id=\"urn:enhancement-794aa15c-a19c-4c65-8622-6d50da13411b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncia<\/span> fundida (<span id=\"urn:enhancement-49bb356b-8c9e-492c-b526-a21ff4948fc1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletrolise\">eletr&oacute;lise<\/span> &iacute;gnea)<\/strong>.<\/p><p class=\"wp-block-paragraph\">Por ser um t&eacute;cnica inversa a da pilha, o <strong>c&aacute;todo da <span id=\"urn:enhancement-fd73bd10-2479-4841-b8b3-eb330f02194d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletrolise\">eletr&oacute;lise<\/span> &eacute; o p&oacute;lo negativo ainda que sofra redu&ccedil;&atilde;o<\/strong>; ao mesmo tempo, <strong>o &acirc;nodo &eacute; o p&oacute;lo positivo, mesmo que seja oxidado.<\/strong>&nbsp;<\/p><h2 class=\"wp-block-heading\" id=\"h-principais-questoes-sobre-eletroquimica-no-enem\"><span class=\"ez-toc-section\" id=\"Principais-questoes-sobre-Eletroquimica-no-Enem\"><\/span>Principais quest&otilde;es sobre Eletroqu&iacute;mica no Enem<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\"><strong>(<span id=\"urn:enhancement-0bc088be-9ea3-40a7-8022-bc336b57cf72\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">ENEM<\/span> 2016)<\/strong>&nbsp;<\/p><p class=\"wp-block-paragraph\">Utens&iacute;lios de uso cotidiano e ferramentas que cont&ecirc;m ferro em sua liga met&aacute;lica tendem a sofrer processo corrosivo e enferrujar. A corros&atilde;o &eacute; um processo eletroqu&iacute;mico e, no caso do ferro, ocorre a <span id=\"urn:enhancement-153f58e1-ae70-4a2e-95d8-36983301ff0b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/precipitacao\">precipita&ccedil;&atilde;o<\/span> do &oacute;xido de ferro(III) hidratado, <span id=\"urn:enhancement-8253beaf-e8d9-4af8-a6a6-0b64eaa5c620\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncia<\/span> marrom pouco sol&uacute;vel, conhecida como ferrugem. Esse processo corrosivo &eacute;, de maneira geral, representado pela <span id=\"urn:enhancement-934d69ca-f4ee-49d0-a5fe-5a5004ad93d4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao-quimica\">equa&ccedil;&atilde;o qu&iacute;mica<\/span>:<\/p><p class=\"has-text-align-center wp-block-paragraph\">4 Fe (s) + 3 O<sub>2<\/sub>(g) + 2 H2O (l) &rarr; 2 Fe<sub>2<\/sub>O<sub>3<\/sub>. H<sub>2<\/sub>O (s)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ferrugem<\/p><p class=\"wp-block-paragraph\">Uma forma de impedir o processo corrosivo nesses utens&iacute;lios &eacute;:<\/p><p class=\"wp-block-paragraph\">A) Renovar sua superf&iacute;cie, polindo-a semanalmente.<br>B) Evitar o contato do utens&iacute;lio com o calor, isolando-o termicamente.<br>C) Impermeabilizar a superf&iacute;cie, isolando-a de seu contato com o ar &uacute;mido.<br>D) Esterilizar frequentemente os utens&iacute;lios, impedindo a prolifera&ccedil;&atilde;o de <span id=\"urn:enhancement-b55504e1-fd09-40f8-8265-95964e536c8e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/bacteria\">bact&eacute;rias<\/span>.<br>E) Guardar os utens&iacute;lios em embalagens, isolando-os do contato com outros objetos<\/p><p class=\"wp-block-paragraph\"><br>Com base no texto da quest&atilde;o, o <strong>processo de oxida&ccedil;&atilde;o de ferro &eacute; uma rea&ccedil;&atilde;o <span id=\"urn:enhancement-f69b8a62-9046-47b3-a40a-ba5a81e1ded6\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletroquimica\">eletroqu&iacute;mica<\/span><\/strong>. Para que ocorra corretamente, o ferro <span id=\"urn:enhancement-4b0cbc54-fb66-4dcb-aa8a-72ae67af34e9\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/solido\">s&oacute;lido<\/span> deve reagir com a <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/caracteristicas-da-agua\/\" target=\"_blank\">&aacute;gua <\/a>l&iacute;quida, com produ&ccedil;&atilde;o de &oacute;xido de ferro (III) hidratado.&nbsp;<\/p><p class=\"wp-block-paragraph\">Por isso, evitar o contato do ferro com a &aacute;gua (ou umidade) pode ser eficaz para a preven&ccedil;&atilde;o do enferrujamento das superf&iacute;cies &ndash; como descreve a alternativa C.&nbsp;<\/p><p class=\"wp-block-paragraph\">Quer entender melhor a <span id=\"urn:enhancement-57b83262-b0a0-4154-9ab5-9fe8fd4b8547\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eletroquimica\">eletroqu&iacute;mica<\/span> no <span id=\"urn:enhancement-01dadcdf-bb2b-40a2-a8a6-92e0dfc48572\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span>? Assista a aula do Estrat&eacute;gia Vestibulares, com o professor Gabriel Prazeres:<\/p><figure class=\"wp-block-embed aligncenter is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"cs-embed cs-embed-responsive\"><iframe title=\"UTI de Qu&iacute;mica para o ENEM: Desmistificando a Eletroqu&iacute;mica\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/JdYiierVtVk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure><h3 class=\"wp-block-heading\" id=\"h-conheca-os-conteudos-exclusivos-do-estrategia\">Conhe&ccedil;a os conte&uacute;dos exclusivos do Estrat&eacute;gia!<\/h3><p class=\"wp-block-paragraph\">Precisa de ajuda com <span id=\"urn:enhancement-a0c0d985-5837-4059-ad38-e1983e510604\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span>, f&iacute;sica e <span id=\"urn:enhancement-80fab300-9a50-4070-9737-ed3e71c2dab2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/biologia\">biologia<\/span>? O Estrat&eacute;gia Vestibulares tem um time preparado para lidar com sua d&uacute;vida! Conhe&ccedil;a nossos cursos preparat&oacute;rios e garanta a sua aprova&ccedil;&atilde;o! Clique no banner abaixo:<\/p><p class=\"wp-block-paragraph\"><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/vestibulares.estrategia.com\/cursos\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/12\/EV4.jpg\" alt=\"CTA - Estrat\u00e9gia Vestibulares 4\" title=\"CTA - Estrat\u00e9gia Vestibulares 4\">\n        <\/a>\n\n\n\n<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Veja-tambem\"><\/span>Veja tamb&eacute;m:<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/quimica-organica-enem\/\">O que mais cai em Qu&iacute;mica Org&acirc;nica no Enem?<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/separacao-de-misturas-enem\/\">Como &eacute; cobrada a Separa&ccedil;&atilde;o de Misturas no Enem?<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/quimica-organica\/\">Qu&iacute;mica Org&acirc;nica no Enem: o que &eacute; e classifica&ccedil;&otilde;es<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/o-que-cai-sobre-equilibrio-quimico-no-enem\/\">O que cai sobre Equil&iacute;brio Qu&iacute;mico no Enem?<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/solucoes-quimicas-no-enem\/\">O que cai de Solu&ccedil;&otilde;es Qu&iacute;micas no Enem?<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/cinetica-quimica\/\">Cin&eacute;tica qu&iacute;mica: defini&ccedil;&atilde;o, f&oacute;rmulas e aplica&ccedil;&otilde;es<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/estequiometria-enem\/\">Estequiometria no Enem: como aparece?<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/calculo-estequiometrico\/\">C&aacute;lculo Estequiom&eacute;trico: o que &eacute; e como calcular!<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/massa-molar\/\">Massa molar: o que &eacute;, n&uacute;mero de mol, como calcular e quest&otilde;es<\/a><\/li>\n<\/ul><\/p>\n","protected":false},"excerpt":{"rendered":"A compreens&atilde;o das rea&ccedil;&otilde;es qu&iacute;micas &eacute; essencial para a aprendizagem pr&eacute;-vestibular. O tema eletroqu&iacute;mica, por exemplo, &eacute; muito&hellip;\n","protected":false},"author":23,"featured_media":53918,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-53917","post","type-post","status-publish","format-standard","has-post-thumbnail","category-quimica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>O que cai sobre Eletroqu\u00edmica no Enem?<\/title>\n<meta name=\"description\" content=\"Conhe\u00e7a os principais aspectos da eletroqu\u00edmica e como eles aparecem no Enem. 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