Question

Cu --> ? --> Cu(NO3)2 --> ? --> CuCl2

Answer 1

2Cu + O2 = 2CuO
CuO + 2HNO3 = Cu(NO3)2 + H2O
Cu(NO3)2 + 2H2O = Cu(OH)2 + 2HNO3
Cu(OH)2 + 2HCl = CuCl2 + 2H2O

Answer 2

Cu --> Cu(NO3)2 --> CuCl2

The chemical reactions you have described involve copper (Cu) reacting with different compounds. Let's go through each step:

1. Cu: This represents elemental copper in its solid form.

2. Cu + HNO3: When copper reacts with nitric acid (HNO3), it forms copper(II) nitrate (Cu(NO3)2) and releases nitrogen dioxide gas (NO2) and water (H2O) as byproducts. The balanced equation for this reaction is:

   3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO2 + 4H2O

3. Cu(NO3)2: Copper(II) nitrate is a compound formed from the reaction between copper and nitric acid. It exists as a blue crystalline solid.

4. Cu(NO3)2 + 2HCl: When copper(II) nitrate reacts with hydrochloric acid (HCl), it forms copper(II) chloride (CuCl2) and releases nitrogen dioxide gas (NO2) and water (H2O) as byproducts. The balanced equation for this reaction is:

   Cu(NO3)2 + 2HCl → CuCl2 + 2HNO3

5. CuCl2: Copper(II) chloride is a compound formed from the reaction between copper(II) nitrate and hydrochloric acid. It exists as a greenish-brown solid.

So, the overall reaction sequence is:

Cu + HNO3 → Cu(NO3)2 + NO2 + H2O

Cu(NO3)2 + 2HCl → CuCl2 + 2HNO3