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class="post-244 post type-post status-publish format-standard has-post-thumbnail hentry category-explicacoes category-quimica category-resumos tag-equilibrio-quimico tag-gasosos tag-quimica-2 tag-resumo tag-temperatura">

Química – Equilíbrio químico

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Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

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Química – Explicação da matéria “Equilíbrio Químico

* Reação irreversível

É aquela que se processa em um sentido até o consumo total dos reagentes.
Exemplo: Combustão (folha de papel)

* Reação reversível

Ela se processa em um sentido direto (Reagentes-> produtos) e no sentido inverso (produto-> reagentes), até conseguir chegar a um estágio de equilíbrio.

Exemplo:

Equilíbrio Químico

No equilíbrio dinâmico as velocidades das reações inversa e direta são idênticas.

Constante de equilíbrio (kc)

Obtendo matematicamente se isolando as constantes cinéticas das equações das velocidades das reações químicas inversa e direta.

A expressão de Kc está relacionada com a Lei de Ação de Massas: “A constante de equilíbrio de uma reação química e obtida pela multiplicação das concentrações molares doa produtos dividida pela dos reagentes, todas elevadas expoentes iguais aos respectivos coeficientes da equação balanceada”.

Reagentes ou produtos sólidos não são representados na expressão da constante de equilíbrio.

Exemplos:
1- Na expressão da constante de equilíbrio em termos de concentração de produtos e reagentes:

A Constante de equilíbrio em termos de pressões parciais de gases (Kp).

Em equilíbrio gasosos, a constante de equilíbrio pode ser expressa em função das pressões parciais dos gases que participam da reação:

Em que P(A), P(b), P©, e P(d) são as pressões parciais dos gases A, B, C e D.

Observação:

1- Na expressão de Kp- usados apenas os componentes gasosos.

2- Na expressão do Kc- componentes sólidos não são usados.

3- Kp e Kc variam somente com a temperatura.

–

Postado por Karen Alves

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