Question

Напишите уравнения реакций, с помощью которых можно осуществить превращения: 1. K->K2O->KOH->K2SO4 2.C->CO2->H2CO3->CaCO3 3.Cu->CuO->?->Cu(OH)2->CuCl2

Answer 1

1. 1 k+o2   2 K2O+h2o  3 KOH+H2so4
2. 1 c+o2      2   CO2+Ca(OH)2 3  +K2CO3
3 1 Cu+o2  2 ? 3 Cu(OH)2+HCl

Answer 2

1. K → K₂O K + 1/2 O₂ → K₂O

   K₂O → KOH K₂O + H₂O → 2 KOH

   KOH → K₂SO₄ 2 KOH + H₂SO₄ → K₂SO₄ + 2 H₂O

2. C → CO₂ C + O₂ → CO₂

   CO₂ → H₂CO₃ CO₂ + H₂O → H₂CO₃

   H₂CO₃ → CaCO₃ H₂CO₃ + Ca(OH)₂ → CaCO₃ + 2 H₂O

3. Cu → CuO 2 Cu + O₂ → 2 CuO

   CuO → ? (unspecified transformation) CuO + ? → ?

   ? → Cu(OH)₂ ? + 2 H₂O → Cu(OH)₂

   Cu(OH)₂ → CuCl₂ Cu(OH)₂ + 2 HCl → CuCl₂ + 2 H₂O

Note: The second and third transformations in the third reaction are unspecified because the given intermediate product and final product are not sufficient to determine the exact reactions. More specific information is needed for a complete set of balanced equations.