Gen Chem II Standard Reduction Potentials
32 flashcards covering Gen Chem II Standard Reduction Potentials for the GENERAL-CHEMISTRY-2 Gen Chem II Topics section.
Standard reduction potentials are a key concept in General Chemistry II, defined by the curriculum set forth by the American Chemical Society (ACS). This topic covers the tendency of a chemical species to acquire electrons and thereby be reduced, quantified by standard reduction potential values measured in volts. Understanding these potentials is crucial for predicting the direction of redox reactions and the feasibility of electrochemical cells.
In practice exams and competency assessments, questions about standard reduction potentials often require students to interpret and compare these values to determine the strongest oxidizing and reducing agents. Common traps include misinterpreting the sign of the potential or overlooking the role of concentration and temperature on the reaction. Students may also confuse the reduction potential of a species with its oxidation potential, leading to incorrect conclusions about reaction spontaneity.
A practical tip to remember is to always refer back to the standard reduction potential table when evaluating redox reactions, as minor calculation errors can lead to significant misunderstandings.
Terms (32)
- 01
What is the standard reduction potential for the half-reaction of zinc ions to zinc metal?
The standard reduction potential for the half-reaction Zn²⁺ + 2e⁻ → Zn is -0.76 V (Zumdahl, General Chemistry).
- 02
How does the standard reduction potential relate to the spontaneity of a redox reaction?
A positive standard reduction potential indicates that the reduction reaction is spontaneous under standard conditions, while a negative potential suggests non-spontaneity (Brown LeMay, General Chemistry).
- 03
What is the standard reduction potential for the half-reaction of copper ions to copper metal?
The standard reduction potential for the half-reaction Cu²⁺ + 2e⁻ → Cu is +0.34 V (Tro, General Chemistry).
- 04
Which metal has a higher standard reduction potential, silver or gold?
Gold has a higher standard reduction potential than silver, indicating it is more likely to be reduced (Brown LeMay, General Chemistry).
- 05
What is the significance of a half-cell with a standard reduction potential of +0.80 V?
A half-cell with a standard reduction potential of +0.80 V indicates a strong oxidizing agent, as it readily accepts electrons (Zumdahl, General Chemistry).
- 06
When combining half-reactions, how do you determine the overall cell potential?
The overall cell potential is determined by adding the standard reduction potentials of the reduction and oxidation half-reactions (Tro, General Chemistry).
- 07
What is the standard reduction potential for the half-reaction of hydrogen ions to hydrogen gas?
The standard reduction potential for the half-reaction 2H⁺ + 2e⁻ → H₂ is defined as 0.00 V (Brown LeMay, General Chemistry).
- 08
How can standard reduction potentials be used to predict the direction of a redox reaction?
By comparing the standard reduction potentials of the two half-reactions, the reaction will proceed in the direction of the higher potential (Tro, General Chemistry).
- 09
What is the standard reduction potential for the half-reaction of iron ions to iron metal?
The standard reduction potential for the half-reaction Fe²⁺ + 2e⁻ → Fe is -0.44 V (Zumdahl, General Chemistry).
- 10
What does a standard reduction potential of -1.66 V indicate about a species?
A standard reduction potential of -1.66 V indicates that the species is a weak oxidizing agent and is less likely to gain electrons (Brown LeMay, General Chemistry).
- 11
Which half-reaction has a higher standard reduction potential: Ag⁺ + e⁻ → Ag or Pb²⁺ + 2e⁻ → Pb?
The half-reaction Ag⁺ + e⁻ → Ag has a higher standard reduction potential than Pb²⁺ + 2e⁻ → Pb, indicating that silver ions are more easily reduced (Tro, General Chemistry).
- 12
What is the standard reduction potential for the half-reaction of chlorine ions to chlorine gas?
The standard reduction potential for the half-reaction Cl₂ + 2e⁻ → 2Cl⁻ is +1.36 V (Brown LeMay, General Chemistry).
- 13
How is the standard reduction potential affected by concentration changes?
The standard reduction potential is not affected by concentration changes as it is defined under standard conditions (1 M concentration) (Zumdahl, General Chemistry).
- 14
What is the relationship between standard reduction potentials and Gibbs free energy?
The relationship is given by the equation ΔG° = -nFE°, where ΔG° is the change in Gibbs free energy, n is the number of moles of electrons, F is Faraday's constant, and E° is the standard cell potential (Brown LeMay, General Chemistry).
- 15
Which half-reaction has a standard reduction potential of +0.80 V?
The half-reaction for the reduction of silver ions to silver metal, Ag⁺ + e⁻ → Ag, has a standard reduction potential of +0.80 V (Zumdahl, General Chemistry).
- 16
What is the standard reduction potential for the half-reaction of lead ions to lead metal?
The standard reduction potential for the half-reaction Pb²⁺ + 2e⁻ → Pb is -0.13 V (Tro, General Chemistry).
- 17
How do you calculate the standard cell potential for a galvanic cell?
The standard cell potential is calculated by subtracting the standard reduction potential of the anode from that of the cathode (Brown LeMay, General Chemistry).
- 18
What is the standard reduction potential for the half-reaction of nitrate ions to nitrogen gas?
The standard reduction potential for the half-reaction NO₃⁻ + 6H⁺ + 5e⁻ → 0.5N₂ + 3H₂O is +0.76 V (Tro, General Chemistry).
- 19
What does a standard reduction potential of +1.23 V indicate about a half-reaction?
A standard reduction potential of +1.23 V indicates that the half-reaction is highly favorable for reduction, making it a strong oxidizing agent (Brown LeMay, General Chemistry).
- 20
How does temperature affect standard reduction potentials?
Standard reduction potentials are defined at standard temperature (25°C), and deviations in temperature can affect reaction kinetics but not the standard values themselves (Zumdahl, General Chemistry).
- 21
What is the standard reduction potential for the half-reaction of chromium ions to chromium metal?
The standard reduction potential for the half-reaction Cr³⁺ + 3e⁻ → Cr is -0.74 V (Tro, General Chemistry).
- 22
What is the standard reduction potential for the half-reaction of lithium ions to lithium metal?
The standard reduction potential for the half-reaction Li⁺ + e⁻ → Li is -3.04 V, indicating lithium is a strong reducing agent (Brown LeMay, General Chemistry).
- 23
What is the standard reduction potential for the half-reaction of manganese ions to manganese metal?
The standard reduction potential for the half-reaction Mn²⁺ + 2e⁻ → Mn is -1.18 V (Tro, General Chemistry).
- 24
How do you determine the strongest oxidizing agent from a list of half-reactions?
The strongest oxidizing agent is the one with the highest standard reduction potential among the listed half-reactions (Brown LeMay, General Chemistry).
- 25
What is the standard reduction potential for the half-reaction of silver ions to silver metal?
The standard reduction potential for the half-reaction Ag⁺ + e⁻ → Ag is +0.80 V (Zumdahl, General Chemistry).
- 26
What is the standard reduction potential for the half-reaction of iodide ions to iodine?
The standard reduction potential for the half-reaction I₂ + 2e⁻ → 2I⁻ is +0.54 V (Brown LeMay, General Chemistry).
- 27
What is the standard reduction potential for the half-reaction of sulfate ions to hydrogen sulfide?
The standard reduction potential for the half-reaction SO₄²⁻ + 8H⁺ + 8e⁻ → H₂S + 4H₂O is +0.16 V (Tro, General Chemistry).
- 28
What is the standard reduction potential for the half-reaction of copper(I) ions to copper metal?
The standard reduction potential for the half-reaction Cu⁺ + e⁻ → Cu is +0.52 V (Brown LeMay, General Chemistry).
- 29
Which half-reaction has a standard reduction potential of +0.77 V?
The half-reaction for the reduction of ferric ions to ferrous ions, Fe³⁺ + e⁻ → Fe²⁺, has a standard reduction potential of +0.77 V (Tro, General Chemistry).
- 30
What does a standard reduction potential of +0.10 V indicate about a half-reaction?
A standard reduction potential of +0.10 V indicates that the half-reaction is slightly favorable for reduction, but not strongly so (Brown LeMay, General Chemistry).
- 31
What is the standard reduction potential for the half-reaction of nitrate to nitrite?
The standard reduction potential for the half-reaction NO₃⁻ + 2H⁺ + 2e⁻ → NO₂⁻ + H₂O is +0.42 V (Tro, General Chemistry).
- 32
What is the standard reduction potential for the half-reaction of bromide ions to bromine?
The standard reduction potential for the half-reaction Br₂ + 2e⁻ → 2Br⁻ is +1.07 V (Brown LeMay, General Chemistry).