Exploring Redox Reactions

What is the oxidation state of sulfur in H2SO4?

• +2

• +6

• +4

• 0

How do you balance the redox reaction: MnO4- + C2O4^2- -> Mn^2+ + CO2?

• 2MnO4- + 5C2O4^2- + 16H+ -> 2Mn^2+ + 10CO2 + 8H2O

• MnO4- + C2O4^2- + 8H+ -> Mn^2+ + 4CO2 + 4H2O

• 3MnO4- + 6C2O4^2- + 12H+ -> 3Mn^2+ + 15CO2 + 6H2O

• MnO4- + 2C2O4^2- + 10H+ -> Mn^2+ + 5CO2 + 5H2O

What is the function of the anode in an electrochemical cell?

• The anode is the site of oxidation in an electrochemical cell.

• The anode generates electrical energy from chemical reactions.

• The anode is the site of reduction in an electrochemical cell.

• The anode is where electrons are collected in an electrochemical cell.

Name one application of redox reactions in everyday life.

• Combustion of fuels

• Rusting of iron

• Batteries

• Photosynthesis

What is the half-reaction for the oxidation of zinc in a redox reaction?

• Zn + 2e- -> Zn^2+

• Zn -> Zn^3+ + 3e-

• Zn^2+ + 2e- -> Zn

• Zn -> Zn^2+ + 2e-

Provide an example of a redox reaction that occurs in batteries.

• C + O2 -> CO2

• Fe + CuSO4 -> FeSO4 + Cu

• 2H2 + O2 -> 2H2O

• Zn + 2MnO2 -> ZnO + Mn2O3

What is the oxidation state of nitrogen in NH4+?

• -3

• 0

• +3

• +1

How do you identify the reducing agent in a redox reaction?

• The reducing agent is the substance that is reduced.

• The reducing agent gains electrons during the reaction.

• The reducing agent is always a metal.

• The reducing agent is the substance that is oxidized.

Explain the role of a salt bridge in an electrochemical cell.

• The role of a salt bridge in an electrochemical cell is to maintain electrical neutrality and allow ion flow between the half-cells.

• To increase the voltage of the cell

• To prevent the flow of electrons

• To act as a catalyst in the reaction

What is the half-reaction method used for in balancing redox reactions?

• To identify the type of redox reaction.

• To calculate the overall energy change in a reaction.

• To balance redox reactions by separating oxidation and reduction processes.

• To determine the physical states of reactants and products.