{"id":16861,"date":"2024-09-21T14:45:41","date_gmt":"2024-09-21T17:45:41","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=16861"},"modified":"2024-09-21T14:45:42","modified_gmt":"2024-09-21T17:45:42","slug":"questao-93-enem-2017","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-93-enem-2017\/","title":{"rendered":"Quest\u00e3o 093 &#8211; ENEM 2017\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Dispositivos eletr\u00f4nicos que utilizam materiais de baixo custo, como pol\u00edmeros semicondutores, t\u00eam sido desenvolvidos para monitorar a concentra\u00e7\u00e3o de am\u00f4nia (g\u00e1s t\u00f3xico e incolor) em granjas av\u00edcolas. A polianilina \u00e9 um pol\u00edmero semicondutor que tem o valor de sua resist\u00eancia el\u00e9trica nominal quadruplicado quando exposta a altas concentra\u00e7\u00f5es de am\u00f4nia. Na aus\u00eancia de am\u00f4nia, a polianilina se comporta como um resistor \u00f4hmico e a sua resposta el\u00e9trica \u00e9 mostrada no gr\u00e1fico.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"333\" height=\"218\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-597.png\" alt=\"\" class=\"wp-image-16865\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-597.png 333w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-597-300x196.png 300w\" sizes=\"(max-width: 333px) 100vw, 333px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O valor da resist\u00eancia el\u00e9trica da polianilina na presen\u00e7a de altas concentra\u00e7\u00f5es de am\u00f4nia, em ohm, \u00e9 igual a&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 0,5 \u00d7 10<sup>0<\/sup> .&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 2,0 \u00d7 10<sup>0<\/sup>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 2,5 \u00d7 10<sup>5<\/sup>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 5,0 \u00d7 10<sup>5<\/sup>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E) 2,0 \u00d7 10<sup>6<\/sup> .<\/p>\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\">Utilizando a Lei de Ohm podemos extrair o valor da resist\u00eancia:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"86\" height=\"87\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-594.png\" alt=\"\" class=\"wp-image-16862 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 86px; --smush-placeholder-aspect-ratio: 86\/87;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Escolhendo um ponto qualquer da curva, 2,0 V e 4,0 x 10<sup>-6<\/sup>, por exemplo, a resist\u00eancia do pol\u00edmero, na aus\u00eancia da am\u00f4nia, \u00e9:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"149\" height=\"97\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-595.png\" alt=\"\" class=\"wp-image-16863 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 149px; --smush-placeholder-aspect-ratio: 149\/97;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Na presen\u00e7a da am\u00f4nia, como o enunciado ressalta, a resist\u00eancia tem seu valor quadruplicado.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"279\" height=\"37\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-596.png\" alt=\"\" class=\"wp-image-16864 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 279px; --smush-placeholder-aspect-ratio: 279\/37;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa E<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dispositivos eletr\u00f4nicos que utilizam materiais de baixo custo, como pol\u00edmeros semicondutores, t\u00eam sido desenvolvidos para monitorar a concentra\u00e7\u00e3o de am\u00f4nia (g\u00e1s t\u00f3xico e incolor) em granjas av\u00edcolas. A polianilina \u00e9 um pol\u00edmero semicondutor que tem o valor de sua resist\u00eancia el\u00e9trica nominal quadruplicado quando exposta a altas concentra\u00e7\u00f5es de am\u00f4nia. Na aus\u00eancia de am\u00f4nia, a [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":16865,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,22],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-16861","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-22","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-fisica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16861","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=16861"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16861\/revisions"}],"predecessor-version":[{"id":16866,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16861\/revisions\/16866"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/16865"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=16861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=16861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=16861"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=16861"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=16861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}