Understanding Redox Reactions

What is oxidation in a redox reaction?

• Oxidation is the transfer of protons in a redox reaction.

• Oxidation is the loss of electrons in a redox reaction.

• Oxidation is the formation of ionic bonds in a redox reaction.

• Oxidation is the gain of electrons in a redox reaction.

What is reduction in a redox reaction?

• Reduction is the transfer of protons in a redox reaction.

• Reduction is the loss of electrons in a redox reaction.

• Reduction involves the oxidation of a substance.

• Reduction is the gain of electrons in a redox reaction.

Identify the oxidizing agent in the reaction: 2H2 + O2 → 2H2O.

• H2

• O3

• H2O

• O2

Identify the reducing agent in the reaction: Zn + CuSO4 → ZnSO4 + Cu.

• Zn

• Cu

• CuSO4

• ZnSO4

In the reaction 4Fe + 3O2 → 2Fe2O3, which element is oxidized?

• Hydrogen (H2)

• Oxygen (O2)

• Iron (Fe)

• Iron(III) oxide (Fe2O3)

In the reaction 2Na + Cl2 → 2NaCl, what happens to sodium?

• Sodium is oxidized.

• Sodium remains unchanged.

• Sodium is reduced.

• Sodium is decomposed.

What is the role of an oxidizing agent?

• The role of an oxidizing agent is to accept electrons and promote oxidation.

• To donate electrons and cause reduction.

• To increase the number of hydrogen atoms in a molecule.

• To stabilize free radicals by losing electrons.

What is the role of a reducing agent?

• The role of a reducing agent is to stabilize a chemical reaction without changing the reactants.

• The role of a reducing agent is to increase the oxidation state of another substance.

• The role of a reducing agent is to accept electrons and oxidize another substance.

• The role of a reducing agent is to donate electrons and reduce another substance.

Which of the following is a common oxidizing agent: H2O2, NaCl, or CH4?

• C2H6

• NaOH

• H2O2

• H2O

Which of the following is a common reducing agent: CO, O2, or H2O?

• CO

• H2

• Cl2

• N2