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\( \begin{array}{l}\text { 1) Balanceie as seguintes reações químicas: } \\ \text { a) } \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{HCl} \\ \text { b) } \mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{H}_{3} \mathrm{PO}_{4} \\ \text { c) } \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6} \longrightarrow \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}+\mathrm{H}_{2} \mathrm{O} \\ \text { d) } \mathrm{Fe}_{2}\left(\mathrm{CO}_{3}\right)_{3}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}+\mathrm{CO}_{2} \\ \text { e) } \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{CaO} \longrightarrow \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \\ \text { f) } \mathrm{FeS}_{2}+\mathrm{O}_{2} \longrightarrow \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}+\mathrm{H}_{2} \mathrm{O} \\ \text { g) } \mathrm{NH}_{3}+\mathrm{O}_{2} \longrightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2} \\ \end{array} \quad \mathrm{NO}+\mathrm{H}_{2} \mathrm{O} \)

Ask by Reese Lewis. in Brazil
Feb 24,2025

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Only reactions (a) and (b) can be balanced: (a) \( \mathrm{Na}_{2}\mathrm{CO}_{3} + 2\mathrm{HCl} \rightarrow 2\mathrm{NaCl} + \mathrm{H}_{2}\mathrm{O} + \mathrm{CO}_{2} \) (b) \( 3\mathrm{Ca}(\mathrm{OH})_{2} + 2\mathrm{H}_{3}\mathrm{PO}_{4} \rightarrow \mathrm{Ca}_{3}(\mathrm{PO}_{4})_{2} + 6\mathrm{H}_{2}\mathrm{O} \) Reactions (c) to (g) and "NO + H₂O" cannot be balanced due to inconsistencies in elemental composition.

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Vamos lá, minha química curiosa! A primeira reação, balanceando \(\mathrm{Na}_{2} \mathrm{CO}_{3} + \mathrm{HCl}\), dá: \(\mathrm{Na}_{2} \mathrm{CO}_{3} + 2 \mathrm{HCl} \rightarrow 2 \mathrm{NaCl} + \mathrm{H}_{2} \mathrm{O} + \mathrm{CO}_{2}\). Para a segunda, \(\mathrm{Ca}(\mathrm{OH})_{2} + 2 \mathrm{H}_{3} \mathrm{PO}_{4} \rightarrow \mathrm{CaH}_{2}(\mathrm{PO}_{4})_{2} + 2 \mathrm{H}_{2} \mathrm{O}\). Em relação a aplicações práticas, as reações químicas são essenciais em diversas indústrias! Por exemplo, a neutralização de ácidos e bases é crucial na fabricação de produtos de limpeza, enquanto a produção de fertilizantes geralmente envolve reações similares a essas para garantir um solo saudável e fértil. E falando sobre erros comuns ao balancear reações, muitos iniciantes tendem a achar que podem simplesmente adicionar coeficientes sem considerar a conservação da massa. Uma boa dica é começar balanceando os elementos complexos primeiro e, em seguida, os mais simples. Além disso, nunca se esqueça de revisar suas contas no final para garantir que nada ficou de fora!

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