tag:blogger.com,1999:blog-62244754194528914632024-03-19T14:40:27.112-07:00 ESTEQUIOMETRIA Cursos de Química
Ensino MédioProf.LEONIR CLEOMAR JANKEhttp://www.blogger.com/profile/15828721296694750100noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6224475419452891463.post-90780672070701849762019-03-26T16:44:00.000-07:002019-03-27T15:12:21.550-07:00<div class="separator" style="clear: both; text-align: center;">
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<b><span style="color: blue; font-family: "arial" , sans-serif; font-size: large;">Leis Ponderais</span></b></div>
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<b><span style="color: blue; font-family: "arial" , sans-serif; font-size: large;">Lei de Lavoisier ou Lei da
Conservação das Massas<o:p></o:p></span></b></div>
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<b><span style="color: blue; font-family: "arial" , sans-serif; font-size: large; line-height: 107%;">Lei de Proust ou Lei das Proporções Constantes</span></b><br />
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<span style="background-color: white; font-family: "arial" , sans-serif; font-size: 12pt;"> </span><b style="background-color: white;"><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">As
Leis Ponderais foram postuladas no século XVIII, sendo essenciais para os
estudos da estequiometria e de outras teorias que foram postuladas
posteriormente. Elas estão relacionadas com as massas dos elementos químicos
dentro das reações químicas.</span></b></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"> <span style="font-family: "arial" , sans-serif;">A Lei de Lavoisier é chamada
de “<span style="border: none windowtext 1.0pt; mso-border-alt: none windowtext 0cm; padding: 0cm;">Lei de Conservação das Massas</span>” e foi introduzida pelo
químico francês Antoine Laurent Lavoisier (1743-1794). Seu enunciado é: </span>“<i>A soma das massas das substâncias reagentes
em um recipiente fechado é igual à soma das massas dos produtos da reação</i>”.</span></b><br />
<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b><span style="font-family: "arial" , "helvetica" , sans-serif;"> </span><span style="font-family: "arial" , "helvetica" , sans-serif;"> </span></b></span><span style="font-family: "arial" , "helvetica" , sans-serif;"><b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><span style="text-indent: 35.4pt;">A Lei
de Proust é chamada de “</span><span style="text-indent: 35.4pt;"><span style="border: none windowtext 1.0pt; mso-border-alt: none windowtext 0cm; padding: 0cm;">Lei das Proporções Constantes</span></span><span style="text-indent: 35.4pt;">”
e foi postulada pelo químico francês Joseph Louis Proust (1754-1826). Seu
enunciado é: </span></span></b><b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">“<i>Uma determinada substância
composta é formada por substâncias mais simples, unidas sempre na mesma
proporção em massa</i>”.</span></b></span><br />
<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: medium;"> </span></b><b>No simulador poderá comprovar a veracidade das leis e na atividade irá verificar o seu aprendizado.</b></span><br />
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<b style="text-align: center;"><span style="font-size: large;"><span style="font-family: "arial" , "helvetica" , sans-serif;">SIMULADOR: </span><a href="https://sites.google.com/site/pibidunbquimicacem03ceilandia/interacao/simulacoes/simulacao---leis-ponderais">Simulação das Leis de Lavoisier e de Proust</a></span></b></div>
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<b><b><span style="font-size: large;"><span style="font-family: "arial" , "helvetica" , sans-serif;">ATIVIDADE</span>:</span><span style="font-size: large;"> <span style="font-size: medium;"><a href="https://pt.khanacademy.org/science/chemistry/chemical-reactions-stoichiome">Balanceamento de equações químicas</a></span></span></b></b></div>
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<b style="font-family: arial, sans-serif;"><span style="color: blue; font-size: large;">Estequiometria
ou Cálculo Estequiométrico</span></b></div>
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<span style="font-family: "arial" , sans-serif; line-height: 107%;"><b><span style="color: blue; font-size: large;">Passos para resolver os cálculos
estequiométricos</span></b></span></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: medium;"><span style="font-size: large; line-height: 107%;"> </span><span style="font-size: large;">Estequiometria é o cálculo da quantidade das substâncias
envolvidas numa reação química. Este é feito com base nas leis das reações e é
executado, em geral, com o auxílio das equações químicas correspondentes.</span></span></b></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"> Para
realizar os cálculos envolvendo a estequiometria devemos seguir algumas
etapas que são importantíssimos para o sucesso na resolução.<o:p></o:p></span></b></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">1°.
Escrever a equação química que representa a reação química (se não estiver representada
no problema).<o:p></o:p></span></b></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">2.
Ajustar os coeficientes estequiométricos da equação (balanceamento da equação
química).<o:p></o:p></span></b></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">3.
Identificar o(s) dado(s) fornecidos no problema.<o:p></o:p></span></b></div>
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<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">4.
Associar o que o problema está perguntando com esse(s) dado(s).<o:p></o:p></span></b><br />
<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b>5. Fazer uma "regra de três" e resolvê-la para determinar o valor da incógnita.</b></span></div>
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<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b> O vídeo mostra um exemplo das etapas que devemos percorrer para resolver um problema envolvendo estequiometria e na atividade você irá verificar a sua aprendizagem.</b></span><br />
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<span style="font-family: "arial" , sans-serif; font-size: large;"><b>VÍDEO: <a href="https://pt.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/stoichiometry-ideal/v/stoichiometry">Etapas da estequiometria</a></b></span></div>
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<b style="font-family: arial, sans-serif; font-size: x-large;">ATIVIDADE:</b><b style="font-family: arial, sans-serif;"><span style="font-size: large;"> <a href="https://docs.google.com/forms/d/e/1FAIpQLSc8kFkPfn9DpeoB1m7hDxz4DHfD3qhqh2-llQUlhqfQTzzzSg/viewform?usp=sf_link">Responder a atividade</a></span></b></div>
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<b style="color: blue;"><span style="font-family: "arial" , sans-serif; font-size: 16pt;">Casos especiais</span></b></div>
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<span style="color: blue;"><b><span style="font-family: "arial" , sans-serif; font-size: 16pt;">Pureza dos reagentes</span><o:p></o:p></b><o:p></o:p></span></div>
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<b><span style="color: blue; font-family: "arial" , sans-serif; font-size: 16pt;">Reagentes em excesso</span></b><o:p></o:p></div>
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<span style="line-height: 107%;"><span style="font-family: "arial" , sans-serif; font-size: 12pt;"> </span><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"> <b>Para os problemas que indicam reagentes impuros, </b></span></span><b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">primeiro devemos determinar a massa que realmente irá </span><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">reagir. Para isso basta
aplicarmos a regra de três e </span><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">determinar a massa do reagente sem as impurezas ou a </span><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">massa das impurezas que devemos descontar dos cálculos.</span></b></div>
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<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b><span style="line-height: 107%;"> </span><span style="text-align: center;">Já para os problemas que apresentam reagentes em
excesso, é necessário determinar qual dos reagentes está em excesso, também usando regra de três e resolver
o problema com os dados do reagente limitante, ou seja, aquele que será
totalmente consumido.</span></b></span></div>
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<span style="text-align: center;"><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b> Na videoaula você pode acompanhar a resolução de exemplos desses casos especiais e na atividade divertir-se com um Quiz de química.</b></span></span><br />
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<b><span style="font-family: "arial" , sans-serif;"><span style="font-size: 16pt;">VIDEOAULA: </span><a href="https://rede.escoladigital.org.br/odas/quimica-calculo-estequiometrico"><span style="font-size: large;">Cálculo
estequiométrico</span></a></span></b></div>
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<b><span style="font-family: "arial" , sans-serif;"><span style="font-size: 16pt;">ATIVIDADE: </span><a href="https://rede.escoladigital.org.br/odas/quiz-de-quimica-basica"><span style="font-size: large;">Quiz de
Química</span></a></span></b></div>
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<b><span style="color: blue; font-family: "arial" , "helvetica" , sans-serif; font-size: large;">Rendimento
das reações e aplicações no cotidiano</span></b></div>
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<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large; line-height: 107%;"><span style="background: rgb(252, 251, 243); line-height: 107%;"> <b> O rendimento de reações químicas é a porcentagem do
rendimento teórico que se alcança na prática. </b></span><span style="background: white; line-height: 107%;"><b>O rendimento real de uma reação é a razão entre o produto
realmente obtido e a quantidade que teoricamente seria obtida, de acordo com a
equação química correspondente e os dados fornecidos.</b></span></span></div>
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<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large; line-height: 107%;"><span style="background: white; line-height: 107%;"><b> No vídeo poderá observar várias situações do seu dia a dia onde a química está presente e como determinar o rendimento de uma reação e na atividade irá responder uma cruzadinha relacionada com materiais que são usados nos laboratórios de química para fazer as reações.</b></span></span></div>
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<span style="font-family: "arial" , sans-serif;"><span style="font-family: "arial" , "helvetica" , sans-serif;"><b><span style="font-size: large;">VÍDEO: <a href="https://rede.escoladigital.org.br/odas/a-quimica-na-sua-vida">A Química na sua vida</a></span></b></span></span></div>
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<span style="font-family: "arial" , sans-serif;"><span style="font-family: "arial" , "helvetica" , sans-serif;"><b style="font-size: x-large;">ATIVIDADE:</b><span style="font-size: large;"> </span><a href="https://rede.escoladigital.org.br/odas/laboratorio-de-quimica"><b><span style="font-size: large;">Cruzadinha de Química - Laboratório</span></b></a></span></span></div>
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<span style="font-family: "arial" , sans-serif;"><span style="font-family: "arial" , "helvetica" , sans-serif;"><b><span style="font-size: large;">CURIOSIDADES: </span><span style="font-size: large;"><a href="https://www.ptable.com/?lang=pt">Conheça cada elemento químico</a></span></b></span></span><br />
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<span style="font-family: "arial" , sans-serif; font-size: large;"> </span><b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"> Aqui você irá conhecer propriedades físicas dos elementos químicos elencados na Tabela Periódica dinâmica. Mito interessante. Vale a pena acessar.</span></b></div>
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<span style="font-family: "arial" , sans-serif; font-size: medium;"><b style="font-family: Arial, Helvetica, sans-serif; font-size: x-large; text-align: justify;">Para finalizar o seu curso acesse a tarefa final e resolva as questões propostas.</b></span></div>
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<span style="font-family: "arial" , sans-serif; font-size: medium;"><b style="font-family: Arial, Helvetica, sans-serif; font-size: x-large; text-align: justify;"><br /></b></span></div>
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<span style="font-family: "arial" , sans-serif;"><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><a href="https://docs.google.com/forms/d/15iBgRwIaCl8rkL8hou528NUdDnWedci-5r8IwImoa9U/edit?usp=sharing"><b>Realizar a tafera final</b></a></span></span></div>
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Prof.LEONIR CLEOMAR JANKEhttp://www.blogger.com/profile/15828721296694750100noreply@blogger.com