Copper $$ _{(\mathrm{s})}+ $$ nitric acid $$ _{(\mathrm{aq})} ightarrow $$ copper (II) nitrate $$ _{(\mathrm{aq})}+ $$ water $$ _{(\mathrm{I})}+{ ext { nitrogen } ext { dioxide }_{(\mathrm{g})}}^{ ext {Observations: }} $$

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Copper $$ _{(\mathrm{s})}+ $$ nitric acid $$ _{(\mathrm{aq})} ightarrow $$ copper (II) nitrate $$ _{(\mathrm{aq})}+ $$ water $$ _{(\mathrm{I})}+{	ext { nitrogen } 	ext { dioxide }_{(\mathrm{g})}}^{	ext {Observations: }} $$

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To analyze the reaction between copper and nitric acid, let's break down the process step by step.

### Known Conditions
1. **Reactants**: Copper (s) and Nitric Acid (aq)
2. **Products**: Copper (II) Nitrate (aq), Water (l), Nitrogen Dioxide (g)

### Step-by-Step Analysis

1. **Identify the Reaction Type**: 
   - This is a redox reaction where copper is oxidized and nitric acid is reduced.

2. **Write the Balanced Chemical Equation**:
   - The unbalanced equation is:
     $$
     \text{Cu}_{(s)} + \text{HNO}_3_{(aq)} \rightarrow \text{Cu(NO}_3\text{)}_2_{(aq)} + \text{H}_2\text{O}_{(l)} + \text{NO}_2_{(g)}
     $$

3. **Balancing the Equation**:
   - To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides. The balanced equation is:
     $$
     \text{Cu}_{(s)} + 4\text{HNO}_3_{(aq)} \rightarrow \text{Cu(NO}_3\text{)}_2_{(aq)} + 2\text{H}_2\text{O}_{(l)} + 2\text{NO}_2_{(g)}
     $$

### Observations During the Reaction
- **Color Change**: The blue color of copper (II) nitrate solution may be observed.
- **Gas Evolution**: Brown nitrogen dioxide gas is evolved.
- **Temperature Change**: The reaction may be exothermic, leading to a temperature increase.

### Conclusion
The reaction between copper and nitric acid produces copper (II) nitrate, water, and nitrogen dioxide, with observable changes such as color change and gas evolution.
Copper reacts with nitric acid to produce copper (II) nitrate, water, and nitrogen dioxide. The balanced equation is: $$ \text{Cu}_{(s)} + 4\text{HNO}_3_{(aq)} \rightarrow \text{Cu(NO}_3\text{)}_2_{(aq)} + 2\text{H}_2\text{O}_{(l)} + 2\text{NO}_2_{(g)} $$ Observations include a blue color change, gas evolution, and a temperature increase.

Copper \( _{(\mathrm{s})}+ \) nitric acid \( _{(\mathrm{aq})} \rightarrow \) copper (II) nitrate \( _{(\mathrm{aq})}+ \) water \( _{(\mathrm{I})}+{\text { nitrogen } \text { dioxide }_{(\mathrm{g})}}^{\text {Observations: }} \)

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