На месте знаков “?” правильно заполните пропуски в уравнениях химических реакций:
Ca + 2HCl = Ca”?” + H2 ↑
2Mg + “?” = 2MgO
2H2”?” + 3O2 = 2H2O + 2SO2
Fe2O3 + 3H2 = 2Fe + 3”?”O
CaCl2 + 2NaOH = Ca(OH)2 + 2Na”?”
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Ca + 2HCl = CaCl + H2 ↑ 2Mg + O2 = 2MgO 2H2O + 3O2 = 2H2O + 2SO2 Fe2O3 + 3H2 = 2Fe + 3H2O CaCl2 + 2NaOH = Ca(OH)2 + 2NaCl