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Esse “fio” de magnésio parece pequeno — mas a reação é intensa e rápida. Quando o magnésio entra em contato com o ácido sulfúrico , ocorre uma reação de oxirredução: o magnésio metálico perde elétrons e os íons H⁺ do ácido ganham elétrons , formando gás hidrogênio . Ao mesmo tempo, forma-se sulfato de magnésio em solução. Equação: Mg + H₂SO₄ → MgSO₄ + H₂ As bolhas visíveis são o hidrogênio sendo liberado, e o aquecimento ocorre porque a reação
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