{"id":8922,"date":"2024-08-06T13:21:14","date_gmt":"2024-08-06T16:21:14","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=8922"},"modified":"2024-08-06T13:21:30","modified_gmt":"2024-08-06T16:21:30","slug":"questao-70-enem-ppl-2015-caderno-9-branco","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-70-enem-ppl-2015-caderno-9-branco\/","title":{"rendered":"Quest\u00e3o 070 \u2013 ENEM PPL 2015 (Caderno 9 \u2013 BRANCO)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">O alum\u00ednio \u00e9 um metal bastante vers\u00e1til, pois, a partir dele, podem-se confeccionar materiais amplamente utilizados pela sociedade. <strong>A obten\u00e7\u00e3o do alum\u00ednio ocorre a partir da bauxita<\/strong>, que \u00e9 <strong>purificada e dissolvida em criolita fundida (Na<sub>3<\/sub>AlF<sub>6<\/sub>) e eletrolisada <\/strong>a cerca de 1 000 \u00b0C. <strong>H\u00e1 libera\u00e7\u00e3o do g\u00e1s di\u00f3xido de carbono (CO<sub>2<\/sub>), formado a partir da rea\u00e7\u00e3o de um dos produtos da <\/strong>eletr\u00f3lise <strong>com o material presente nos eletrodos.<\/strong> O <strong>\u00e2nodo<\/strong> \u00e9 formado por <strong>barras de grafita<\/strong> submergidas na mistura fundida. <strong>O c\u00e1todo<\/strong> \u00e9 uma <strong>caixa de ferro coberta de grafita<\/strong>. A rea\u00e7\u00e3o global do processo \u00e9:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"369\" height=\"34\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-283.png\" alt=\"\" class=\"wp-image-8923 lazyload\" title=\"\" data-srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-283.png 369w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-283-300x28.png 300w\" data-sizes=\"(max-width: 369px) 100vw, 369px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 369px; --smush-placeholder-aspect-ratio: 369\/34;\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na etapa de <strong>obten\u00e7\u00e3o do alum\u00ednio l\u00edquido, as rea\u00e7\u00f5es que ocorrem no c\u00e1todo e \u00e2nodo s\u00e3o:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"316\" height=\"655\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-284.png\" alt=\"\" class=\"wp-image-8924\" style=\"width:230px;height:auto\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-284.png 316w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-284-145x300.png 145w\" sizes=\"(max-width: 316px) 100vw, 316px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A partir da an\u00e1lise da equa\u00e7\u00e3o de oxirredu\u00e7\u00e3o, pode-se perceber que o alum\u00ednio sofre redu\u00e7\u00e3o r as redu\u00e7\u00f5es s\u00e3o sempre cat\u00f3dicas. No \u00e2nodo, os \u00edons O\u00b2\u207b ser\u00e3o oxidados para formar oxig\u00eanio molecular (O\u2082), que posteriormente oxida o eletrodo de carbono formando CO<sub>2<\/sub>.<\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\"><strong>C\u00e1todo (redu\u00e7\u00e3o):<\/strong> Al<sup>3+<\/sup> +3 e<sup>\u2212<\/sup>\u2192 Al<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00c2nodo (oxida\u00e7\u00e3o):<\/strong> 2 O<sup>2\u2212<\/sup>\u2192 O<sup>2<\/sup>\u200b + 4e<sup>\u2212<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rea\u00e7\u00e3o do eletrodo de carbono:<\/strong> C + O<sub>2<\/sub> \u200b\u2192 CO<sub>2<\/sub>\u200b<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa A<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O alum\u00ednio \u00e9 um metal bastante vers\u00e1til, pois, a partir dele, podem-se confeccionar materiais amplamente utilizados pela sociedade. A obten\u00e7\u00e3o do alum\u00ednio ocorre a partir da bauxita, que \u00e9 purificada e dissolvida em criolita fundida (Na3AlF6) e eletrolisada a cerca de 1 000 \u00b0C. H\u00e1 libera\u00e7\u00e3o do g\u00e1s di\u00f3xido de carbono (CO2), formado a partir [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":8923,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,94],"tags":[],"area-do-conhecimento":[116,120],"assunto":[],"class_list":["post-8922","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-ppl","category-2015-questoes-ppl","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-quimica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/8922","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/comments?post=8922"}],"version-history":[{"count":2,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/8922\/revisions"}],"predecessor-version":[{"id":8926,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/8922\/revisions\/8926"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/8923"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=8922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=8922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=8922"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=8922"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=8922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}