Williams RETEST: Investigation 13 - Redox Reactions

What happens in a redox reaction?

• Electrons are created.
• Electrons are transferred.
• Electrons are destroyed.
• Electrons are stationary.

In the example given, what happens to iron during the reaction?

• It gains electrons.
• It loses electrons.
• It remains neutral.
• It becomes a reducing agent.

What does reduction refer to in the context of redox reactions?

• A loss of electrons.
• A gain of electrons.
• An increase in charge.
• A decrease in mass.

Which statement is true about oxidation numbers?

• They are the same as actual charges.
• They can be negative or positive.
• They must add up to the charge of the ion in polyatomic ions.
• They are always positive.

In the reaction discussed, what is the role of oxygen?

• It is the reducing agent.
• It is the oxidizing agent.
• It is neutral.
• It does not participate in the reaction.

Which substance is being oxidized in the reaction?

• Fluorine
• Aluminum
• Oxygen
• Hydrogen

What is the oxidation number of aluminum in its solid state?

• +3
• 0
• -1
• +1

Which substance is being reduced during the reaction?

• Aluminum
• Hydrogen
• Oxygen
• Fluorine

What defines the oxidizing agent in a chemical reaction?

• The substance that gains electrons
• The substance that is oxidized
• The substance that loses electrons
• The substance with the highest oxidation number

Which substance acts as the reducing agent?

• Fluorine
• Oxygen
• Aluminum
• Hydrogen