{"id":25284,"date":"2022-04-06T13:30:17","date_gmt":"2022-04-06T16:30:17","guid":{"rendered":"https:\/\/beduka.com\/blog\/?p=25284"},"modified":"2022-04-06T13:33:25","modified_gmt":"2022-04-06T16:33:25","slug":"questoes-sobre-reacoes-quimicas","status":"publish","type":"post","link":"https:\/\/beduka.com\/blog\/exercicios\/questoes-sobre-reacoes-quimicas\/","title":{"rendered":"As 10 melhores quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas, com gabarito!"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong><em>As Rea\u00e7\u00f5es Qu\u00edmicas s\u00e3o um dos assuntos mais cobrados pelo Enem e demais vestibulares quando o assunto \u00e9 Qu\u00edmica. Para potencializar seus estudos, al\u00e9m de trazer um resumo completo sobre o tema, tamb\u00e9m selecionamos as 10 melhores quest\u00f5es sobre rea\u00e7\u00f5es qu\u00edmicas, com gabarito!<\/em><\/strong><\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Quer seguir diretamente para alguma parte espec\u00edfica? <strong>Clique em algum dos t\u00f3picos abaixo:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#o-que-s\u00e3o-rea\u00e7\u00f5es-qu\u00edmicas\" data-type=\"internal\" data-id=\"#o-que-s\u00e3o-rea\u00e7\u00f5es-qu\u00edmicas\">O que s\u00e3o as Rea\u00e7\u00f5es Qu\u00edmicas?<\/a><\/li><li><a href=\"#tipos-de-rea\u00e7\u00f5es-qu\u00edmicas\" data-type=\"internal\" data-id=\"#tipos-de-rea\u00e7\u00f5es-qu\u00edmicas\">Tipos de Rea\u00e7\u00f5es Qu\u00edmicas<\/a><\/li><li><a href=\"#quest\u00f5es-sobre-rea\u00e7\u00f5es-qu\u00edmicas\" data-type=\"internal\" data-id=\"#quest\u00f5es-sobre-rea\u00e7\u00f5es-qu\u00edmicas\">Quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/a><\/li><li><a href=\"#gabarito-das-quest\u00f5es-sobre-rea\u00e7\u00f5es-qu\u00edmicas\" data-type=\"internal\" data-id=\"#gabarito-das-quest\u00f5es-sobre-rea\u00e7\u00f5es-qu\u00edmicas\">Gabarito das quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/a><\/li><li><a href=\"#entre-na-faculdade-com-o-beduka\" data-type=\"internal\" data-id=\"#entre-na-faculdade-com-o-beduka\">Entre na faculdade com o Beduka!<\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Quer praticar mais exerc\u00edcios de Qu\u00edmica? Fa\u00e7a o <a href=\"https:\/\/beduka.com\/simulado-enem\/#\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Simulado Enem do Beduka<\/strong><\/a>, ele \u00e9 100% <strong>gratuito <\/strong>e <strong>personaliz\u00e1vel<\/strong>!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"o-que-s\u00e3o-rea\u00e7\u00f5es-qu\u00edmicas\">O que s\u00e3o as Rea\u00e7\u00f5es Qu\u00edmicas?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As Rea\u00e7\u00f5es Qu\u00edmicas s\u00e3o <strong>fen\u00f4menos qu\u00edmicos<\/strong> que envolvem a <strong>mudan\u00e7a ou a transforma\u00e7\u00e3o da mat\u00e9ria<\/strong>, alterando sua constitui\u00e7\u00e3o a <strong>n\u00edvel molecular.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em outras palavras, podemos dizer que uma rea\u00e7\u00e3o qu\u00edmica n\u00e3o \u00e9 apenas uma mudan\u00e7a de estado, mas sim um <strong>rearranjo dos \u00e1tomos.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As rea\u00e7\u00f5es qu\u00edmicas apresentam <strong>dois tipos principais de subst\u00e2ncias:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Reagentes<\/strong>: componentes originais que se misturam e reagem entre si;<\/li><li><strong>Produtos<\/strong>: s\u00e3o o resultado da rea\u00e7\u00e3o, ap\u00f3s as transforma\u00e7\u00f5es.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Uma rea\u00e7\u00e3o qu\u00edmica \u00e9 representada da seguinte forma:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>REAGENTES \u2192 PRODUTOS<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Veja nosso <strong>artigo completo sobre <\/strong><a href=\"https:\/\/beduka.com\/blog\/materias\/quimica\/calculo-estequiometrico\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>C\u00e1lculo Estequiom\u00e9trico<\/strong><\/a> e saiba como calcular as quantidades das subst\u00e2ncias envolvidas em uma<strong> rea\u00e7\u00e3o qu\u00edmica!<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existem v\u00e1rios fatores envolvidos em uma rea\u00e7\u00e3o qu\u00edmica. Um deles \u00e9 a <strong>entalpia <\/strong>(quantidade de energia encontrada nas subst\u00e2ncias).&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quando os reagentes possuem mais energia que os produtos e ela \u00e9 liberada no processo, temos uma uma <strong>rea\u00e7\u00e3o exot\u00e9rmica<\/strong>. J\u00e1 quando os produtos possuem mais energia que os reagentes, chamamos de <strong>rea\u00e7\u00e3o endot\u00e9rmica<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/beduka.com\/blog\/materias\/quimica\/o-que-e-entalpia\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Entenda o que \u00e9 a Entalpia com nosso resumo completo<\/strong><\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A seguir, voc\u00ea ver\u00e1 os tipos de rea\u00e7\u00f5es qu\u00edmicas mais comuns e como s\u00e3o representadas. <strong>Leia com aten\u00e7\u00e3o<\/strong> pois <strong>entender as diferen\u00e7as entre os tipos de rea\u00e7\u00f5es<\/strong> ser\u00e1 importante para resolver as <strong>quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas!<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tipos-de-rea\u00e7\u00f5es-qu\u00edmicas\">Tipos de Rea\u00e7\u00f5es Qu\u00edmicas<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Rea\u00e7\u00e3o de S\u00edntese ou Adi\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e3o aquelas onde as subst\u00e2ncias se juntam formando uma <strong>\u00fanica subst\u00e2ncia.<\/strong> Veja o exemplo a seguir, onde os reagentes est\u00e3o representados por A e B:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A + B \u2192 AB<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Podemos citar o caso do carbono que une-se ao oxig\u00eanio para formar o di\u00f3xido de carbono: <strong>C + O2 \u2192 CO2<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rea\u00e7\u00e3o de Decomposi\u00e7\u00e3o ou An\u00e1lise<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e3o o oposto da rea\u00e7\u00e3o de s\u00edntese. Nessa rea\u00e7\u00e3o, <strong>uma subst\u00e2ncia \u00e9 decomposta em duas ou mais<\/strong>. Como no exemplo abaixo:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>AB \u2192 A + B<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essa decomposi\u00e7\u00e3o pode ocorrer por tr\u00eas motivos:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Pir\u00f3lise<\/strong>: aquecimento.<\/li><li><strong>Eletr\u00f3lise<\/strong>: passagem de corrente el\u00e9trica pela subst\u00e2ncia fundida ou em meio aquoso.<\/li><li><strong>Fot\u00f3lise<\/strong>: luz.&nbsp;<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Um exemplo interessante de rea\u00e7\u00e3o de decomposi\u00e7\u00e3o ou an\u00e1lise \u00e9 no <strong>acionamento dos airbags,<\/strong> onde ocorre a decomposi\u00e7\u00e3o da azida de s\u00f3dio por calor (pir\u00f3lise).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ex: <strong>2 NaN3 \u2192 2 Na + 3 N2<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rea\u00e7\u00e3o de Simples Troca ou Deslocamento<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nesse caso, uma<strong> subst\u00e2ncia simples reage com uma composta, dando origem a outra subst\u00e2ncia simples e outra composta<\/strong>, ou seja, acontece a troca dos ligantes. Observe o exemplo abaixo:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>AB + C \u2192 A + CB<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Um exemplo comum de rea\u00e7\u00e3o de simples troca ou deslocamento \u00e9 a <strong>forma\u00e7\u00e3o de ferrugem<\/strong> em materiais feitos de ferro.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A ferrugem \u00e9 formada pelo \u00f3xido de ferro que se forma quando o ferro met\u00e1lico perde el\u00e9trons e \u00e9 oxidado: <strong>2Fe + O2 + 2H2O \u2192 2Fe(OH)2<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rea\u00e7\u00e3o de Dupla Troca<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Esse tipo de rea\u00e7\u00e3o acontece entre <strong>duas subst\u00e2ncias compostas<\/strong>, em que <strong>seus elementos fazem trocas entre si, formando novas subst\u00e2ncias compostas. <\/strong>Veja o exemplo:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>AB + CD \u2192 AD + CB<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uma aplica\u00e7\u00e3o da rea\u00e7\u00e3o de dupla troca \u00e9 o caso das <a href=\"https:\/\/beduka.com\/blog\/materias\/quimica\/quimica-inorganica-enem\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>rea\u00e7\u00f5es de neutraliza\u00e7\u00e3o<\/strong><\/a>, em que uma base e um \u00e1cido formam um sal e \u00e1gua.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ex: <strong>HCl + NaOH \u2192 NaCl + H2O<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Agora que voc\u00ea entendeu tudo sobre o que s\u00e3o as rea\u00e7\u00f5es qu\u00edmicas e seus principais tipos, responda as 10 melhores<strong> quest\u00f5es sobre rea\u00e7\u00f5es qu\u00edmicas!<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"quest\u00f5es-sobre-rea\u00e7\u00f5es-qu\u00edmicas\">Quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 1 &#8211; (<\/strong><a href=\"https:\/\/www.gov.br\/inep\/pt-br\/areas-de-atuacao\/avaliacao-e-exames-educacionais\/enem\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ENEM<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os tubos de PVC, material organoclorado sint\u00e9tico, s\u00e3o normalmente utilizados como encanamento na constru\u00e7\u00e3o civil. Ao final da sua vida \u00fatil, uma das formas de descarte desses tubos pode ser a incinera\u00e7\u00e3o. Nesse processo libera-se HC\u2113 (g), cloreto de hidrog\u00eanio, dentre outras subst\u00e2ncias. Assim, \u00e9 necess\u00e1rio um tratamento para evitar o problema da emiss\u00e3o desse poluente. Entre as alternativas poss\u00edveis para o tratamento, \u00e9 apropriado canalizar e borbulhar os gases provenientes da incinera\u00e7\u00e3o em:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> \u00e1gua dura.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> \u00e1gua de cal.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) <\/strong>\u00e1gua salobra.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> \u00e1gua destilada.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> \u00e1gua desmineralizada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 2 &#8211; (<\/strong><a href=\"https:\/\/ufmg.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UFMG<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Todos os fen\u00f4menos descritos s\u00e3o exemplos de rea\u00e7\u00f5es qu\u00edmicas, exceto:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> dissolu\u00e7\u00e3o de um comprimido efervescente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> eletr\u00f3lise da \u00e1gua.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> enferrujamento de um prego exposto ao ar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> fus\u00e3o de parafina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> queima de uma vela.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 3 &#8211; (<\/strong><a href=\"https:\/\/www2.unesp.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UNESP<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Colocando-se \u00f3xido de s\u00f3dio em \u00e1gua, forma-se uma solu\u00e7\u00e3o que cont\u00e9m:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> \u00edons s\u00f3dio e \u00edons oxig\u00eanio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> s\u00f3dio met\u00e1lico.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) <\/strong>mol\u00e9culas de hidr\u00f3xido de s\u00f3dio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> \u00edons s\u00f3dio e \u00edons hidroxila.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> mol\u00e9culas de \u00f3xido de s\u00f3dio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Estamos apenas no come\u00e7o das <strong>quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/strong>. Concentre-se e d\u00ea o seu melhor!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 4 &#8211; (<\/strong><a href=\"https:\/\/ufrj.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UFRJ<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A rea\u00e7\u00e3o que representa a forma\u00e7\u00e3o do cromato de chumbo II, que \u00e9 um pigmento amarelo usado em tintas, \u00e9 representada pela equa\u00e7\u00e3o:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pb(CH3COO)2 + Na2CrO4 \u2192 PbCrO4 + 2 NaCH3COO<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Que \u00e9 uma rea\u00e7\u00e3o de:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> oxirredu\u00e7\u00e3o<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> dupla troca<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> s\u00edntese<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> deslocamento<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> decomposi\u00e7\u00e3o<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 5 &#8211; (<\/strong><a href=\"https:\/\/portal.ufpa.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UFPA<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dadas as rea\u00e7\u00f5es qu\u00edmicas:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a. NH3(g) + HCl(g) &#8212;&gt; NH4Cl(l)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b. 2H2O2(aq) &#8212;&gt; 2H2O(l) + O2(g)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">c. NaOH(aq) + HCl(aq) &#8212;&gt; NaCl(aq) + H2O(l)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">d. Zn(s) + H2SO4(aq) &#8212;&gt; ZnSO4(aq) + H2(g)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">e. CaO(s) + H2O(l) &#8212;&gt; Ca(OH)2(aq)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">associe-as corretamente com as afirmativas abaixo<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">( ) rea\u00e7\u00e3o de simples troca<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">( ) rea\u00e7\u00e3o de s\u00edntese, tendo como produto um sal<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">( ) rea\u00e7\u00e3o de s\u00edntese, tendo como produto uma base<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">( ) rea\u00e7\u00e3o de an\u00e1lise<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">( ) rea\u00e7\u00e3o de dupla troca<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a sequ\u00eancia correta encontrada de cima para baixo nos par\u00eanteses \u00e9<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) <\/strong>&nbsp;d, a, e, b, c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong>&nbsp; a, e, b, d, c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong>&nbsp; d, a, e, c, b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> c, b, e, a, d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Muito bem! Voc\u00ea chegou na metade das <strong>quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 6 &#8211; (<\/strong><a href=\"https:\/\/www.gov.br\/inep\/pt-br\/areas-de-atuacao\/avaliacao-e-exames-educacionais\/enem\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ENEM<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Grande quantidade dos maus odores do nosso dia a dia est\u00e1 relacionada a compostos alcalinos. Assim, em v\u00e1rios desses casos, pode-se utilizar o vinagre, que cont\u00e9m entre 3,5% e 5% de \u00e1cido ac\u00e9tico, para diminuir ou eliminar o mau cheiro. Por exemplo, lavar as m\u00e3os com vinagre e depois enxagu\u00e1-las com \u00e1gua elimina o odor de peixe, j\u00e1 que a mol\u00e9cula de piridina (C5H5N) \u00e9 uma das subst\u00e2ncias respons\u00e1veis pelo odor caracter\u00edstico de peixe podre.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SILVA, V. A.; BENITE, A. M. C.; SOARES, M. H. F. B. Algo aqui n\u00e3o cheira bem&#8230; A qu\u00edmica do mau cheiro. Qu\u00edmica Nova na Escola, v. 33, n. 1, fev. 2011 (adaptado).&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A efici\u00eancia do uso do vinagre nesse caso se explica pela&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> sobreposi\u00e7\u00e3o de odor, propiciada pelo cheiro caracter\u00edstico do vinagre.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> solubilidade da piridina, de car\u00e1ter \u00e1cido, na solu\u00e7\u00e3o \u00e1cida empregada.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> inibi\u00e7\u00e3o da prolifera\u00e7\u00e3o das bact\u00e9rias presentes, devido \u00e0 a\u00e7\u00e3o do \u00e1cido ac\u00e9tico.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> degrada\u00e7\u00e3o enzim\u00e1tica da mol\u00e9cula de piridina, acelerada pela presen\u00e7a de \u00e1cido ac\u00e9tico.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> rea\u00e7\u00e3o de neutraliza\u00e7\u00e3o entre o \u00e1cido ac\u00e9tico e a piridina, que resulta em compostos sem mau odor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 7 &#8211; (<\/strong><a href=\"http:\/\/ct.ufpb.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UFPB<\/strong><\/a><strong>)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uma das etapas do tratamento da \u00e1gua para consumo consiste na adi\u00e7\u00e3o de cal viva e de sulfato de alum\u00ednio \u00e0 \u00e1gua a ser tratada. Essas subst\u00e2ncias reagem conforme a equa\u00e7\u00e3o qu\u00edmica n\u00e3o balanceada a seguir:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ca(OH)2(aq) + Al2(SO4)3(aq) \u2192 Al(OH)3(s) + CaSO4(aq)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O hidr\u00f3xido de alum\u00ednio formado na rea\u00e7\u00e3o tem a fun\u00e7\u00e3o de agregar as impurezas s\u00f3lidas contidas na \u00e1gua, formando bolas que se depositam no fundo dos tanques e s\u00e3o retiradas, ficando apenas \u00e1gua limpa. Com base nessas informa\u00e7\u00f5es, \u00e9 correto afirmar:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> Os coeficientes que tornam a equa\u00e7\u00e3o balanceada s\u00e3o respectivamente 2, 3, 2 e 3.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> A rea\u00e7\u00e3o \u00e9 de dupla troca, com forma\u00e7\u00e3o de precipitado.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> A rea\u00e7\u00e3o \u00e9 de simples troca, com oxida\u00e7\u00e3o-redu\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> A rea\u00e7\u00e3o \u00e9 de s\u00edntese, com forma\u00e7\u00e3o de precipitado.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> A rea\u00e7\u00e3o \u00e9 de decomposi\u00e7\u00e3o, com oxida\u00e7\u00e3o-redu\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 8 &#8211; (<\/strong><a href=\"https:\/\/www.pucpr.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PUC-PR<\/strong><\/a><strong>)&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fazendo-se a classifica\u00e7\u00e3o das rea\u00e7\u00f5es abaixo:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(I) CuSO4 + 2NaOH &#8212;-&gt; Cu(OH)2 + Na2SO4&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(II) Cu(OH)2 &#8212;-&gt; CuO + H2O&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(III) Zn + 2AgNO3 &#8212;-&gt; 2Ag + Zn(NO3)2&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(IV) NH3 + HC\u2113 &#8212;-&gt; NH4C\u2113&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A ordem correta \u00e9:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> Decomposi\u00e7\u00e3o, simples troca, dupla troca, adi\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> Dupla troca, adi\u00e7\u00e3o, simples troca, an\u00e1lise.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> Dupla troca, an\u00e1lise, deslocamento, s\u00edntese.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> Deslocamento, an\u00e1lise, dupla troca, adi\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> Dupla troca, decomposi\u00e7\u00e3o, s\u00edntese, simples troca.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Calma, a lista de <strong>quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/strong> est\u00e1 chegando ao fim. Vamos com tudo para os dois \u00faltimos exerc\u00edcios!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 9 &#8211; (<\/strong><a href=\"http:\/\/www.uftm.edu.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UFTM<\/strong><\/a><strong>)&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Defici\u00eancia de Zn2+ no organismo de uma crian\u00e7a pode causar problemas de crescimento. Esse mal pode ser evitado atrav\u00e9s da ingest\u00e3o de comprimidos de \u00f3xido de Zinco, que interagem com o \u00e1cido do est\u00f4mago de acordo com a equa\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ZnO(s) + 2 H+(aq) \u2192 Zn+2(aq) + H2O(\u2113)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A rea\u00e7\u00e3o representada \u00e9 rea\u00e7\u00e3o de:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> deslocamento.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)<\/strong> oxirredu\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> dupla troca.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> s\u00edntese.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> an\u00e1lise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 10 &#8211; (<\/strong><a href=\"http:\/\/www.ita.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ITA<\/strong><\/a><strong>)&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Introduz-se uma chapinha de cobre em uma solu\u00e7\u00e3o aquosa de cloreto f\u00e9rrico contida em um copo. Com o passar do tempo nota-se o seguinte:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; n\u00e3o h\u00e1 desprendimento de g\u00e1s;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; a chapinha de cobre perde espessura, mas conserva sua cor caracter\u00edstica;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; a cor da solu\u00e7\u00e3o vai mudando aos poucos.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em face dessas observa\u00e7\u00f5es, qual a op\u00e7\u00e3o que cont\u00e9m a equa\u00e7\u00e3o qu\u00edmica que melhor representa o &#8220;desaparecimento&#8221; do cobre na solu\u00e7\u00e3o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)<\/strong> Cu (c) + Fe2+ (aq) \u2192 Cu2+ (aq) + Fe (c)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) <\/strong>Cu (c) + 2H+ (aq) \u2192 Cu2+ (aq) + H2 (g)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)<\/strong> Cu (c) + 2Fe3+ (aq) \u2192 Cu2+ (aq) + 2Fe2+ (aq)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d) <\/strong>3Cu (c) + 2Fe3+ (aq) \u2192 3Cu2+ (aq) + 2Fe (c)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e)<\/strong> Cu (c) + 2OH- (aq) \u2192 (CuO2)2- (aq) + H2 (g)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parab\u00e9ns! Voc\u00ea finalizou nossa lista das melhores <strong>quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/strong>, n\u00e3o deixe de conferir suas respostas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"gabarito-das-quest\u00f5es-sobre-rea\u00e7\u00f5es-qu\u00edmicas\">Gabarito das quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 1 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>b)<\/strong> \u00e1gua de cal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 2 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>d)<\/strong> fus\u00e3o de parafina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 3 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>d)<\/strong> \u00edons s\u00f3dio e \u00edons hidroxila.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 4 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>b)<\/strong> dupla troca<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 5 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>a) <\/strong>&nbsp;d, a, e, b, c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 6 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>e)<\/strong> rea\u00e7\u00e3o de neutraliza\u00e7\u00e3o entre o \u00e1cido ac\u00e9tico e a piridina, que resulta em compostos sem mau odor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 7 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>b)<\/strong> A rea\u00e7\u00e3o \u00e9 de dupla troca, com forma\u00e7\u00e3o de precipitado.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 8 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>c)<\/strong> Dupla troca, an\u00e1lise, deslocamento, s\u00edntese.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 9 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>c)<\/strong> dupla troca.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido quest\u00e3o 10 \u2013&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>c)<\/strong> Cu (c) + 2Fe3+ (aq) \u2192 Cu2+ (aq) + 2Fe2+ (aq)&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esperamos ter ajudado com a nossa sele\u00e7\u00e3o das melhores <strong>quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas<\/strong>. Bons estudos!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"entre-na-faculdade-com-o-beduka\">Entre na faculdade com o Beduka!<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nosso maior objetivo \u00e9 te ver cursando a faculdade dos seus sonhos e para isso sempre trazemos as melhores solu\u00e7\u00f5es.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/beduka.com\/bolsas\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>J\u00e1 conhece o Beduka Bolsas?&nbsp;<\/strong><\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Na plataforma do <strong>Beduka Bolsas<\/strong> voc\u00ea pode comprar uma bolsa de estudos com excelentes descontos na mensalidade.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Al\u00e9m de escolher entre <strong>mais de 90 cursos<\/strong> em uma de nossas <strong>10 universidades parceiras.<\/strong> <a href=\"https:\/\/beduka.com\/bolsas\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Garanta j\u00e1 a sua bolsa!<\/strong><\/a>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Receba nossos <strong>conte\u00fados di\u00e1rios e gratuitos<\/strong> seguindo o <a href=\"https:\/\/www.instagram.com\/beduka_oficial\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Instagram<\/strong><\/a> e o <a href=\"https:\/\/br.pinterest.com\/bedukaoficial\/_created\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Pinterest<\/strong><\/a>! Nessas redes postamos resumos sobre os principais assuntos do Enem e Vestibulares.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Obrigada por ler at\u00e9 aqui!<\/p>\n","protected":false},"excerpt":{"rendered":"<p> Entenda o que s\u00e3o as Rea\u00e7\u00f5es Qu\u00edmicas e seus principais tipos. Em seguida, teste seus conhecimentos com as melhores quest\u00f5es sobre rea\u00e7\u00f5es qu\u00edmicas!<\/p>\n","protected":false},"author":1,"featured_media":25285,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[568],"tags":[],"class_list":["post-25284","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exercicios"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>As 10 melhores quest\u00f5es sobre Rea\u00e7\u00f5es Qu\u00edmicas [com gabarito]<\/title>\n<meta name=\"description\" content=\"Entenda o que s\u00e3o as Rea\u00e7\u00f5es Qu\u00edmicas e seus principais tipos. 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