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Questions and Answers
Which statement best describes what is taking place in the half reaction Fe --> Fe2+ + 2e-?
Which statement best describes what is taking place in the half reaction Fe --> Fe2+ + 2e-?
- Iron is being reduced.
- Iron is combining with oxygen.
- Iron is in a neutral state.
- Iron is being oxidized. (correct)
What step should be completed immediately after finding the oxidation states of atoms when using the half-reaction method?
What step should be completed immediately after finding the oxidation states of atoms when using the half-reaction method?
Identifying the half reactions.
Which half reaction correctly describes the oxidation taking place in the reaction Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)?
Which half reaction correctly describes the oxidation taking place in the reaction Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)?
Zn(s) --> Zn2+(aq) + 2e-
What is the overall equation for the chemical reaction represented by the half reactions Zn --> Zn2+(aq) + 2e- and Cu2+(aq) + 2e- --> Cu(s)?
What is the overall equation for the chemical reaction represented by the half reactions Zn --> Zn2+(aq) + 2e- and Cu2+(aq) + 2e- --> Cu(s)?
What is the purpose of finding oxidation states in the half-reaction method for balancing equations?
What is the purpose of finding oxidation states in the half-reaction method for balancing equations?
The reaction H2 + O2 --> 2H+ + O2- is balanced for charge and number of atoms.
The reaction H2 + O2 --> 2H+ + O2- is balanced for charge and number of atoms.
What is the coefficient of silver in the final, balanced equation for the reaction Ag+(aq) + Al(s) --> Ag(s) + Al3+(aq)?
What is the coefficient of silver in the final, balanced equation for the reaction Ag+(aq) + Al(s) --> Ag(s) + Al3+(aq)?
Which half-reaction correctly describes an oxidation?
Which half-reaction correctly describes an oxidation?
Which statement best describes what is taking place in the half reaction Cu2+(aq) + 2e- --> Cu(s)?
Which statement best describes what is taking place in the half reaction Cu2+(aq) + 2e- --> Cu(s)?
What is an important step in the alternate method for balancing equations in redox reactions?
What is an important step in the alternate method for balancing equations in redox reactions?
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Study Notes
Oxidation-Reduction Reactions
- In the half reaction Fe → Fe²⁺ + 2e⁻, iron is oxidized as it loses electrons.
- The half-reaction method balances equations by breaking them into oxidation and reduction components.
Steps for Balancing Equations
- After determining oxidation states of atoms, the next step is identifying the respective half reactions in the redox process.
Half Reactions in Redox Reactions
- For the reaction Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g), the oxidation half-reaction is Zn(s) → Zn²⁺(aq) + 2e⁻.
- In a paired half reaction system, Zn is oxidized while Cu²⁺ is reduced, resulting in the overall reaction: Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s).
Purpose of Oxidation States
- Finding oxidation states helps in identifying the half reactions needed for balancing equations in the redox method.
Balancing Charge and Atom Count
- The reaction H₂ + O₂ → 2H⁺ + O₂⁻ is unbalanced concerning charge and atom count, indicating an error in the stoichiometry.
Coefficients in Balanced Equations
- In the redox reaction Ag⁺(aq) + Al(s) → Ag(s) + Al³⁺(aq), the coefficient of silver in the balanced equation is 3, reflecting the stoichiometric needs of the reaction.
Identifying Oxidation
- An example of an oxidation half-reaction is Cr(s) → Cr³⁺(aq) + 3e⁻, where chromium loses electrons.
Reduction in Half Reactions
- The half reaction Cu²⁺(aq) + 2e⁻ → Cu(s) depicts reduction, as copper gains electrons to form solid copper.
Importance of Half Reactions
- Determining half reactions is essential in the alternative method for balancing redox equations, ensuring proper tracking of electron transfer.
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