Understanding Redox Reactions

• Hydrogen

• Oxygen

• Both hydrogen and oxygen

• Neither hydrogen nor oxygen

What does "oxidation" mean in a redox reaction?

• Gain of electrons

• Loss of electrons

• Gain of protons

• Loss of neutrons

What is the oxidizing agent in a redox reaction?

• The substance that loses electrons

• The substance that gains electrons

• The substance that is neutral

• The substance that forms a precipitate

Which of the following statements is true about reduction?

• It involves the loss of electrons

• It involves the gain of electrons

• It involves the loss of protons

• It involves the gain of neutrons

• Sodium (Na)

• Chlorine (Cl)

• Both sodium and chlorine

• Neither sodium nor chlorine

• None of the above

• Copper (Cu)

• Silver (Ag)

• Nitrogen (N)

• Oxygen (O)

Which of the following best defines a redox reaction?

• A reaction where acids and bases neutralize each other

• A reaction involving the transfer of electrons between substances

• A reaction that forms a precipitate

• A reaction that produces water and salt

A teacher asks students to identify which of the following everyday processes involves a redox reaction. Which is correct?

• Dissolving sugar in water

• Rusting of iron

• Melting of ice

• Boiling of water

What happens to the oxidation number of an element that is oxidized?

• It increases

• It decreases

• It stays the same

• It becomes zero