{"id":9243,"date":"2024-08-06T21:20:42","date_gmt":"2024-08-07T00:20:42","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=9243"},"modified":"2024-08-06T21:21:22","modified_gmt":"2024-08-07T00:21:22","slug":"questao-62-enem-2011","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-62-enem-2011\/","title":{"rendered":"Quest\u00e3o 062 \u2013 ENEM 2011"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A <strong>eutrofiza\u00e7\u00e3o \u00e9 um processo em que rios, lagos e mares adquirem n\u00edveis altos de nutrientes<\/strong>, especialmente fosfatos e nitratos, provocando posterior ac\u00famulo de mat\u00e9ria org\u00e2nica em decomposi\u00e7\u00e3o. <strong>Os nutrientes s\u00e3o assimilados pelos produtores prim\u00e1rios e o crescimento desses \u00e9 controlado pelo nutriente lim\u00edtrofe, que \u00e9 o elemento menos dispon\u00edvel em rela\u00e7\u00e3o \u00e0 abund\u00e2ncia<\/strong> necess\u00e1ria \u00e0 sobreviv\u00eancia dos organismos vivos. O ciclo representado na figura seguinte reflete a din\u00e2mica dos nutrientes em um lago.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"916\" height=\"556\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-367.png\" alt=\"\" class=\"wp-image-9244\" style=\"width:610px;height:auto\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-367.png 916w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-367-300x182.png 300w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-367-768x466.png 768w\" sizes=\"(max-width: 916px) 100vw, 916px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A an\u00e1lise da \u00e1gua de um lago que recebe a descarga de \u00e1guas residuais provenientes de lavouras adubadas revelou as <strong>concentra\u00e7\u00f5es dos elementos carbono (21,2 mol\/L), nitrog\u00eanio (1,2 mol\/L) e f\u00f3sforo (0,2 mol\/L). Nessas condi\u00e7\u00f5es, o nutriente lim\u00edtrofe \u00e9 o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) C.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) N.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) P.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) CO<sub>2<\/sub>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E) PO<sub>4<\/sub><sup>3-<\/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\">O nutriente lim\u00edtrofe \u00e9 aquele que apresenta disponibilidade mais baixa em rela\u00e7\u00e3o \u00e0 quantidade necess\u00e1ria para a sobreviv\u00eancia dos organismos vivos. Para identific\u00e1-lo, precisamos comprar as raz\u00f5es at\u00f4micas dos elementos C, N e P com as concentra\u00e7\u00f5es fornecidas.<\/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>Dados:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; Raz\u00f5es at\u00f4micas dos elementos C, N e P: 106: 16: 1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; Concentra\u00e7\u00f5es:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C<\/strong> = 21,2 mol\/L<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>N<\/strong> = 1,2 mol\/L<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P<\/strong> = 0,2 mol\/L<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para verificar qual nutriente est\u00e1 em falta, precisamos comparar as propor\u00e7\u00f5es de nitrog\u00eanio (N), f\u00f3sforo (P) e carbono (C) com a quantidade ideal necess\u00e1ria \u00e0 sobreviv\u00eancia dos organismos vivos:<\/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>Comparando N e P<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">16 (N) &#8212;&#8212;&#8212;&#8212;&#8212; 1 (P)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1,2 mol\/L (N) &#8212;&#8212; x<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>x = 0,075 mol\/L<\/strong><\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0,075 mol\/L \u00e9 a concentra\u00e7\u00e3o ideal de f\u00f3sforo. Por\u00e9m, a concentra\u00e7\u00e3o real \u00e9 de 0,2 mol\/L. Logo, o f\u00f3sforo est\u00e1 em excesso.<\/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>Comparando N e C<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">16 (N) &#8212;&#8212;&#8212;&#8212;&#8212; 106 (C)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1,2 mol\/L (N) &#8212;&#8212; y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>x = 7,95 mol\/L<\/strong><\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7,95 mol\/L \u00e9 a concentra\u00e7\u00e3o ideal de carbono. Por\u00e9m, a concentra\u00e7\u00e3o real \u00e9 de 21,2 mol\/L. Logo, o carbono tamb\u00e9m est\u00e1 em excesso.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se f\u00f3sforo e carbono est\u00e3o em excesso, o nitrog\u00eanio \u00e9 o nutriente lim\u00edtrofe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa B<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A eutrofiza\u00e7\u00e3o \u00e9 um processo em que rios, lagos e mares adquirem n\u00edveis altos de nutrientes, especialmente fosfatos e nitratos, provocando posterior ac\u00famulo de mat\u00e9ria org\u00e2nica em decomposi\u00e7\u00e3o. Os nutrientes s\u00e3o assimilados pelos produtores prim\u00e1rios e o crescimento desses \u00e9 controlado pelo nutriente lim\u00edtrofe, que \u00e9 o elemento menos dispon\u00edvel em rela\u00e7\u00e3o \u00e0 abund\u00e2ncia necess\u00e1ria [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":9244,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,28],"tags":[],"area-do-conhecimento":[116,120],"assunto":[],"class_list":["post-9243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-28","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\/9243","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=9243"}],"version-history":[{"count":3,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/9243\/revisions"}],"predecessor-version":[{"id":9247,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/9243\/revisions\/9247"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/9244"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=9243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=9243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=9243"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=9243"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=9243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}