{"id":8630,"date":"2019-06-11T10:14:09","date_gmt":"2019-06-11T13:14:09","guid":{"rendered":"https:\/\/quiprocura.net\/w\/?p=8630"},"modified":"2019-06-11T10:14:09","modified_gmt":"2019-06-11T13:14:09","slug":"interacoes-intermoleculares","status":"publish","type":"post","link":"https:\/\/quiprocura.net\/w\/2019\/06\/11\/interacoes-intermoleculares\/","title":{"rendered":"Intera\u00e7\u00f5es Intermoleculares"},"content":{"rendered":"<div  class='avia-builder-widget-area clearfix  avia-builder-el-0  el_before_av_two_third  avia-builder-el-first '><div id=\"text-35\" class=\"widget clearfix widget_text\">\t\t\t<div class=\"textwidget\"><h3>QuiProcura Qu\u00edmica<\/h3>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-5517334625230773\"\n     crossorigin=\"anonymous\"><\/script><br \/>\n<!-- anuncio superior --><br \/>\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:728px;height:90px\"\n     data-ad-client=\"ca-pub-5517334625230773\"\n     data-ad-slot=\"3817602043\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/p>\n<\/div>\n\t\t<\/div><\/div>\n<div class=\"flex_column av_two_third  flex_column_div av-zero-column-padding first  avia-builder-el-1  el_after_av_sidebar  el_before_av_one_third  \" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><h1>Intera\u00e7\u00f5es Intermoleculares<\/h1>\n<p>No estado gasoso as mol\u00e9culas se encontram bem afastadas, com grande grau de desordem.<\/p>\n<p>No estado\u00a0\u00a0 l\u00edquido\u00a0 as mol\u00e9culas se encontram\u00a0 um\u00a0 pouco\u00a0 mais\u00a0 organizadas, com um grau de liberdade de movimenta\u00e7\u00e3o um pouco\u00a0 menor. J\u00e1 no estado s\u00f3lido as mol\u00e9culas se encontram bem mais organizadas, com grau de movimenta\u00e7\u00e3o\u00a0 ainda mais reduzido.<br \/>\n<img decoding=\"async\" src=\"http:\/\/quiprocura.net\/w\/wp-content\/uploads\/2015\/06\/for\u00e7as-intermoleculares.jpg\" alt=\"\" \/><\/p>\n<p>O que faz as mol\u00e9culas ficarem mais unidas no estado s\u00f3lido do que no estado l\u00edquido ou gasoso?<\/p>\n<p>Isso \u00e9 responsabilidade das <strong>for\u00e7as intermoleculares<\/strong> (ou <strong>intera\u00e7\u00f5es intermoleculares<\/strong> ou liga\u00e7\u00f5es intermoleculares). E elas s\u00e3o de 3 tipos: intera\u00e7\u00e3o\u00a0de Van der Waals ou de London, ou ainda intera\u00e7\u00e3o\u00a0dipolo induzido; intera\u00e7\u00e3o\u00a0diplo-dipolo e liga\u00e7\u00e3o de hidrog\u00eanio.<\/p>\n<h3>Intera\u00e7\u00e3o dipolo-dipolo<\/h3>\n<p>Considerando uma mol\u00e9cula de de H-Cl, temos que ocorre forma\u00e7\u00e3o de p\u00f3los em sua estrutura,\u00a0 ou seja, o cloro atrair\u00e1 mais o <em>e<strong><sup>&#8211;<\/sup><\/strong><\/em> do que o hidrog\u00eanio, devido \u00e0 sua maior eletronegatividade, sendo assim a parte do Cl ficar\u00e1 negativa e a parte do H ficar\u00e1 positiva e essa polariza\u00e7\u00e3o ser\u00e1 permanente. Sendo assim, considere agora v\u00e1rias mol\u00e9culas de\u00a0 H \u2013 Cl. Uma mol\u00e9cula atrair\u00e1 a outra. A parte parcialmente negativa de uma mol\u00e9cula atrai a parte parcialmente positiva da outra mol\u00e9cula e assim se d\u00e1\u00a0 entre todas as mol\u00e9culas do l\u00edquido ou s\u00f3lido formado por HCl.<\/p>\n<p>Esse tipo de <strong>intera\u00e7\u00e3o<\/strong> entre as mol\u00e9culas \u00e9 caracter\u00edstico de todas mol\u00e9culas polares.<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.quiprocura.net\/ligacao\/liga12_arquivos\/image003.jpg\" alt=\"\" \/><\/p>\n<h3>Intera\u00e7\u00e3o\u00a0de Hidrog\u00eanio:<\/h3>\n<p>Quando uma mol\u00e9cula tiver um H ligado a um elemento eletronegativo (F,O,N) haver\u00e1\u00a0 uma grande polariza\u00e7\u00e3o da mol\u00e9cula, sendo assim, se esta mol\u00e9cula aproximar de uma outra mol\u00e9cula que possuir F,O,N ocorrer\u00e1 a forma\u00e7\u00e3o da <strong>Liga\u00e7\u00e3o de Hidrog\u00eanio<\/strong> que \u00e9 uma\u00a0for\u00e7a bastante intensa em rela\u00e7\u00e3o \u00e0s outras for\u00e7as intermoleculares.<\/p>\n<p>Este tipo de liga\u00e7\u00e3o (<strong>intera\u00e7\u00e3o<\/strong>) \u00e9 um caso especial de intera\u00e7\u00e3o\u00a0dipolo-dipolo, s\u00f3 ocorrendo ent\u00e3o entre mol\u00e9culas polares.<\/p>\n<p>Exemplo: mol\u00e9culas de \u00e1gua , de NH<sub>3<\/sub> ,de H-F em H<sub>2<\/sub>O, ou NH<sub>3<\/sub> formam liga\u00e7\u00e3o de hidrog\u00eanio entre si.<br \/>\n<img decoding=\"async\" src=\"http:\/\/quiprocura.net\/w\/wp-content\/uploads\/2015\/06\/interacao-intermolecular.jpg\" alt=\"\" \/><\/p>\n<h3>Intera\u00e7\u00e3o\u00a0de Van der Waals<\/h3>\n<p>Liga\u00e7\u00e3o que ocorre entre todas as mol\u00e9culas at\u00e9 entre as apolares, sendo\u00a0 o \u00fanico tipo de intera\u00e7\u00e3o entre mol\u00e9culas apolares.<\/p>\n<p>Em uma mol\u00e9cula apolar\u00a0 a liga\u00e7\u00e3o\u00a0existente \u00e9 entre elementos com eletronegatividades semelhantes, ou igual, ficando os el\u00e9trons\u00a0 da liga\u00e7\u00e3o\u00a0 \u201cindecisos\u201d em rela\u00e7\u00e3o \u00e0 sua posi\u00e7\u00e3o, ou seja, ele\u00a0 n\u00e3o sabe para qual \u00e1tomo ele se aproxima mais. Ora\u00a0 ele est\u00e1 em um elemento, ora\u00a0 em outro, fazendo\u00a0 a mol\u00e9cula, ora possuir um polo\u00a0 positivo\u00a0 de um lado, ora do outro lado.<\/p>\n<p>Sendo isso que gera a liga\u00e7\u00e3o dipolo induzido, ou liga\u00e7\u00e3o de Van der Waals, o dipolo\u00a0moment\u00e2neo na mol\u00e9cula.<\/p>\n<p><strong>For\u00e7a relativa das intera\u00e7\u00f5es intermoleculares<\/strong><\/p>\n<p>Van der Waals &lt; dipolo-dipolo &lt; liga\u00e7\u00e3o de Hidrog\u00eanio.<\/p>\n<p><em>Temperatura\u00a0de ebuli\u00e7\u00e3o:<\/em><\/p>\n<p>Existe uma rela\u00e7\u00e3o importante entre <strong>intera\u00e7\u00f5es intermoleculares<\/strong> e temperatura\u00a0de ebuli\u00e7\u00e3o, pois\u00a0quanto mais forte for a intera\u00e7\u00e3o que as mol\u00e9culas de um determinado l\u00edquido fizer, maior ser\u00e1 sua temperatura de ebuli\u00e7\u00e3o.<\/p>\n<p>Para compara temperatura\u00a0de ebuli\u00e7\u00e3o, tamb\u00e9m deve-se considerar o peso da mol\u00e9cula, mas n\u00e3o d\u00e1 para analisar a mol\u00e9cula pelas duas regras de uma s\u00f3 vez, deve se manter uma delas constante e olhar a outra.<\/p>\n<p><em>Exemplo:<\/em><\/p>\n<p>Subst\u00e2ncias com massa molecular pr\u00f3ximas: a subst\u00e2ncia que fizer intera\u00e7\u00e3o mais intensa \u00e9 a que tem temperatura\u00a0de ebuli\u00e7\u00e3o maior, mas\u00a0 se\u00a0 as duas fizerem\u00a0 a mesma intera\u00e7\u00e3o e tiverem massas diferentes a de maior massa ter\u00e1 a maior temperatura\u00a0de ebuli\u00e7\u00e3o.<\/p>\n<p>Isso \u00e9 muito importante saber, pois\u00a0 a partir dessa rela\u00e7\u00e3o entre <strong>intera\u00e7\u00e3o intermolecular<\/strong> e massa molar se pode ter\u00a0 uma ideia do estado f\u00edsico da subst\u00e2ncia \u00e0 uma determinada temperatura.<\/p>\n<\/div><\/section><\/div><div class=\"flex_column av_one_third  flex_column_div av-zero-column-padding   avia-builder-el-3  el_after_av_two_third  avia-builder-el-last  \" style='border-radius:0px; '><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[506,691,230],"class_list":["post-8630","post","type-post","status-publish","format-standard","hentry","category-conteudos-curriculares","tag-ensino-medio","tag-interacoes-intermoleculares","tag-ligacao-quimica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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