QuestionSeptember 20, 2025

Data Sheet: A Sequence of Chemical Reactions:Transforming Copper Balance the following chemical reactions and record your observations for all the reactants and the products in each step. For each part observation there should be one observation per chemical Observations are changes in color,physical state, etc. Part 1: Nitric acid is added to copper metal: underline ( )Cu(s)+underline (4)H_(3)O^+(aq)+underline (2) NO_(3)^-(aq)arrow underline ( )[Cu(H_(2)O)_(6)]^2+(aq)+underline (2) NO_(2)(g) Appearance of reactants .Copper wire was shiny.brown, and thick. Nitric acid was colorless. Appearance of products:Nitric acid was green first, then light blue Evidence of a chemical reaction: Gas formation, color change, and yellow color gas production. Part 2: Sodium hydroxide is added to the aqueous copper solution: underline ( )(Cu(H_(2)O)_(4)^2+(aq)+underline (2)OH^-(aq)arrow underline ( )Cu(OH)_(2)(s)+underline (6)H_(2)O(l) Appearance of reactants: Clear light blue solution Appearance of products:Cloudy dark blue solution Evidence of a chemical reaction: Solution turned from light blue to dark blue Copper Transformation, Saint Joseph's University, Department of Chemistry

Data Sheet: A Sequence of Chemical Reactions:Transforming Copper Balance the following chemical reactions and record your observations for all the reactants and the products in each step. For each part observation there should be one observation per chemical Observations are changes in color,physical state, etc. Part 1: Nitric acid is added to copper metal: underline ( )Cu(s)+underline (4)H_(3)O^+(aq)+underline (2) NO_(3)^-(aq)arrow underline ( )[Cu(H_(2)O)_(6)]^2+(aq)+underline (2) NO_(2)(g) Appearance of reactants .Copper wire was shiny.brown, and thick. Nitric acid was colorless. Appearance of products:Nitric acid was green first, then light blue Evidence of a chemical reaction: Gas formation, color change, and yellow color gas production. Part 2: Sodium hydroxide is added to the aqueous copper solution: underline ( )(Cu(H_(2)O)_(4)^2+(aq)+underline (2)OH^-(aq)arrow underline ( )Cu(OH)_(2)(s)+underline (6)H_(2)O(l) Appearance of reactants: Clear light blue solution Appearance of products:Cloudy dark blue solution Evidence of a chemical reaction: Solution turned from light blue to dark blue Copper Transformation, Saint Joseph's University, Department of Chemistry
Data Sheet: A Sequence of Chemical Reactions:Transforming Copper Balance the following chemical reactions and record your observations for all the reactants and the products in each step. For each part observation there should be one observation per chemical Observations are changes in color,physical state, etc. Part 1: Nitric acid is added to copper metal: underline ( )Cu(s)+underline (4)H_(3)O^+(aq)+underline (2) NO_(3)^-(aq)arrow underline ( )[Cu(H_(2)O)_(6)]^2+(aq)+underline (2) NO_(2)(g) Appearance of reactants .Copper wire was shiny.brown, and thick. Nitric acid was colorless. Appearance of products:Nitric acid was green first, then light blue Evidence of a chemical reaction: Gas formation, color change, and yellow color gas production. Part 2: Sodium hydroxide is added to the aqueous copper solution: underline ( )(Cu(H_(2)O)_(4)^2+(aq)+underline (2)OH^-(aq)arrow underline ( )Cu(OH)_(2)(s)+underline (6)H_(2)O(l) Appearance of reactants: Clear light blue solution Appearance of products:Cloudy dark blue solution Evidence of a chemical reaction: Solution turned from light blue to dark blue Copper Transformation, Saint Joseph's University, Department of Chemistry

Solution
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Answer

**Balanced equations:** Part 1: 3Cu(s) + 8H_3O^+(aq) + 2NO_3^-(aq) \rightarrow 3[Cu(H_2O)_6]^{2+}(aq) + 2NO_2(g) + 4H_2O(l) Part 2: [Cu(H_2O)_4]^{2+}(aq) + 2OH^-(aq) \rightarrow Cu(OH)_2(s) + 4H_2O(l) **Observations:** Part 1: - Cu: Shiny, brown solid - Nitric acid: Colorless - [Cu(H_2O)_6]^{2+}: Green then light blue solution - NO_2: Yellow-brown gas Part 2: - [Cu(H_2O)_4]^{2+}: Light blue solution - OH^-: Colorless - Cu(OH)_2: Dark blue, cloudy precipitate - H_2O: Colorless liquid Explanation 1. Balance the Chemical Equations Part 1: 3Cu(s) + 8H_3O^+(aq) + 2NO_3^-(aq) \rightarrow 3[Cu(H_2O)_6]^{2+}(aq) + 2NO_2(g) + 4H_2O(l) Part 2: [Cu(H_2O)_4]^{2+}(aq) + 2OH^-(aq) \rightarrow Cu(OH)_2(s) + 4H_2O(l) 2. Record Observations for Each Reactant and Product Part 1: - Copper (Cu): Shiny, brown, solid. - Nitric acid (H_3O^+/NO_3^-): Colorless solution. - [Cu(H_2O)_6]^{2+}: Green at first, then light blue solution. - NO_2: Yellow-brown gas. - Evidence: Gas formation, color change. Part 2: - [Cu(H_2O)_4]^{2+}: Clear, light blue solution. - OH^-: Colorless solution. - Cu(OH)_2: Cloudy, dark blue precipitate. - H_2O: Colorless liquid. - Evidence: Solution turns from light blue to dark blue, precipitate forms.

Explanation

1. Balance the Chemical Equations<br /> Part 1: $3Cu(s) + 8H_3O^+(aq) + 2NO_3^-(aq) \rightarrow 3[Cu(H_2O)_6]^{2+}(aq) + 2NO_2(g) + 4H_2O(l)$ <br />Part 2: $[Cu(H_2O)_4]^{2+}(aq) + 2OH^-(aq) \rightarrow Cu(OH)_2(s) + 4H_2O(l)$<br /><br />2. Record Observations for Each Reactant and Product<br /> Part 1:<br />- Copper (Cu): Shiny, brown, solid.<br />- Nitric acid ($H_3O^+$/$NO_3^-$): Colorless solution.<br />- $[Cu(H_2O)_6]^{2+}$: Green at first, then light blue solution.<br />- $NO_2$: Yellow-brown gas.<br />- Evidence: Gas formation, color change.<br /><br /> Part 2:<br />- $[Cu(H_2O)_4]^{2+}$: Clear, light blue solution.<br />- $OH^-$: Colorless solution.<br />- $Cu(OH)_2$: Cloudy, dark blue precipitate.<br />- $H_2O$: Colorless liquid.<br />- Evidence: Solution turns from light blue to dark blue, precipitate forms.
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