HNO3 конц. + Cu = CaCO3 = Cu(NO3)2 = K2CO3 + H2SO4 = CO + CuO = H2SO4 + AI2O3 =

Here are the reactions you provided:

1. HNO3 (конц.) + Cu:

   • Concentrated nitric acid reacts with copper to produce copper(II) nitrate (Cu(NO3)2), nitrogen dioxide (NO2), and water (H2O).
   • Reaction: \[ 4 \text{HNO}_3 + \text{Cu} \rightarrow \text{Cu(NO}_3)_2 + 2 \text{NO}_2 + 2 \text{H}_2\text{O} \]

2. CaCO3 (Calcium Carbonate):

   • Calcium carbonate decomposes upon heating to produce calcium oxide (CaO) and carbon dioxide (CO2).
   • Reaction: \[ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \]

3. Cu(NO3)2 (Copper(II) Nitrate):

   • This compound doesn't have a direct reaction in your question, but copper(II) nitrate can decompose upon heating to produce copper(II) oxide (CuO), nitrogen dioxide (NO2), and oxygen (O2).
   • Reaction: \[ 2 \text{Cu(NO}_3)_2 \rightarrow 2 \text{CuO} + 4 \text{NO}_2 + \text{O}_2 \]

4. K2CO3 + H2SO4 (Potassium Carbonate + Sulfuric Acid):

   • This reaction produces potassium sulfate (K2SO4), water (H2O), and carbon dioxide (CO2).
   • Reaction: \[ \text{K}_2\text{CO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{K}_2\text{SO}_4 + \text{H}_2\text{O} + \text{CO}_2 \]

5. CO + CuO:

   • Carbon monoxide reacts with copper(II) oxide to produce copper (Cu) and carbon dioxide (CO2).
   • Reaction: \[ \text{CO} + \text{CuO} \rightarrow \text{Cu} + \text{CO}_2 \]

6. H2SO4 + Al2O3 (Sulfuric Acid + Aluminum Oxide):

   • Aluminum oxide reacts with sulfuric acid to form aluminum sulfate (Al2(SO4)3) and water (H2O).
   • Reaction: \[ \text{H}_2\text{SO}_4 + \text{Al}_2\text{O}_3 \rightarrow \text{Al}_2(\text{SO}_4)_3 + 3 \text{H}_2\text{O} \]

If you need any more details or clarifications on any of these reactions, feel free to ask!