Oxidation and Reduction

What is the oxidation number of an element in its elemental form?

• 2

• -1

• 0

• 1

Define a redox reaction.

• A redox reaction involves the transfer of neutrons between two species.

• A redox reaction involves the transfer of protons between two species.

• A redox reaction involves the transfer of electrons between two species.

• A redox reaction involves the transfer of energy between two species.

How do you balance a redox equation?

• By adding random coefficients to the equation

• By flipping the equation upside down

• By balancing the atoms and charges on both sides of the equation.

• By counting the number of vowels in the equation

What is an oxidizing agent?

• A substance that can accept electrons from another substance, causing the other substance to be oxidized.

• A substance that speeds up a chemical reaction without being consumed.

• A substance that remains unchanged in a chemical reaction.

• A substance that can donate electrons to another substance, causing the other substance to be reduced.

Provide an example of a reducing agent.

• Potassium permanganate

• Hydrogen peroxide

• Sodium borohydride (NaBH4)

• Sodium chloride

What is the oxidation number of oxygen in most compounds?

• +2

• -1

• 0

• -2

Explain the concept of oxidation numbers.

• Oxidation numbers are used to determine the color of a chemical compound

• Oxidation numbers are assigned to atoms in a chemical compound or ion to indicate the electron distribution around the atom. It is a measure of the atom's ability to attract or lose electrons in a chemical reaction.

• Oxidation numbers represent the number of protons in an atom

• Oxidation numbers are only applicable to organic compounds

What happens to the oxidation number of an element in a reduction reaction?

• It remains the same

• It increases

• It decreases

• It fluctuates

Why is it important to balance redox equations?

• To add unnecessary complexity to the reaction

• To confuse students studying chemistry

• To ensure conservation of charge and mass in the reaction.

• To waste time without any benefit

Identify the reducing agent in the reaction: Zn + CuSO4 -> ZnSO4 + Cu

• Na

• Ag

• Zn

• Fe