Mastering Redox Reactions

What is the oxidation state of sulfur in H2SO4?

• +6

• 0

• +2

• +4

Identify the oxidation state of nitrogen in NH3.

• -1

• -3

• +1

• +3

Using the half-reaction method, how would you balance the reaction of MnO4- with Fe2+ in acidic solution?

• MnO4- + 4H+ + 2Fe2+ -> Mn2+ + 2H2O + 2Fe3+

• MnO4- + 10H+ + 5Fe2+ -> Mn2+ + 5H2O + 5Fe3+

• MnO4- + 8H+ + 5Fe2+ -> Mn2+ + 4H2O + 5Fe3+

• MnO4- + 6H+ + 3Fe2+ -> Mn3+ + 3H2O + 3Fe3+

What is the balanced equation for the reduction of Cr2O7^2- to Cr^3+ in acidic solution?

• Cr2O7^2- + 8 H+ + 3 e- -> 2 Cr^3+ + 4 H2O

• Cr2O7^2- + 14 H+ + 6 e- -> 2 Cr^3+ + 7 H2O

• Cr2O7^2- + 12 H+ + 4 e- -> 2 Cr^3+ + 6 H2O

• Cr2O7^2- + 6 H+ + 2 e- -> Cr^3+ + 3 H2O

How do you balance the redox reaction of Zn with Cu2+ in basic solution?

• Zn + Cu2+ + 2OH- → Zn(OH)2 + Cu + H2O

• Zn + Cu2+ + 4OH- → Zn(OH)4^2- + Cu + 2H2O

• Zn + Cu2+ + 6OH- → Zn(OH)6^2- + Cu + 3H2O

• Zn + Cu + 4OH- → Zn(OH)4 + Cu2+ + 2H2O

What is the oxidation state of chlorine in NaClO3?

• +5

• -1

• +1

• +3

Describe the steps involved in balancing a redox reaction using the half-reaction method.

• Identifying only the oxidizing agent

• The steps involved in balancing a redox reaction using the half-reaction method include identifying half-reactions, balancing atoms and charges, and combining them.

• Combining half-reactions without balancing

• Ignoring charge balance during the process

What is the balanced equation for the oxidation of Fe2+ to Fe3+ in acidic solution?

• Fe^2+ → Fe^3+ + e^-

• Fe^3+ + e^- → Fe^2+

• Fe^2+ + 2H^+ → Fe^3+ + H2

• Fe^2+ + e^- → Fe^4+

How do you determine the oxidation states of elements in a compound?

• Ignore the overall charge of the compound.

• Oxidation states are always positive numbers.

• Use only the periodic table to assign states.

• Assign oxidation states based on known rules and balance with the overall charge.

What is the balanced equation for the reaction of hydrogen peroxide (H2O2) with iodide ions (I-) in basic solution?

• H2O2 + I- -> I2 + H2O

• 2 H2O2 + I- -> I2 + 2 H2O

• 2 H2O2 + 2 I- -> I2 + 2 H2O + 2 OH-

• H2O2 + 2 I- -> I2 + 2 OH-