Download - Aula 04 grupo 2A.ppt
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Metais Alcalinos TerrososMetais Alcalinos Terrosos
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Periodicidade QuímicaPeriodicidade Química
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• Resistente a corrosão: não reage com o ar devido a presença da camada passivadora na sua superfície
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Núcleo com alta seção de choque para captura de nêutron e elevado ponto de fusão
• Sais de Be são tóxicos: restringe suas aplicações industriais
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• Responsável pela ativação de muitas enzimas
(queima ao ar com uma chama branca intensa)
(leite de magnésia e sal de Epson - MgSO4.7H2O)
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. Principal componente da argamassa e cimento
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• Eficientes na absorção de raios X devido ao grande número de elétrons (BaSO4)
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Na indústria, o controle da dureza da água é de fundamental importância quando esta é utilizada em caldeiras, já que os referidos sais podem acumular-se no interior das tubulações, levando a obstruções e conseqüentes prejuízos.
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Remoção: utiliza-se coluna de resina de troca- iônica, onde os íons Ca2+ e Mg2+ são substituídos por Na+
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