Redox Reactions and Thermodynamics Quiz

What does "Redox" stand for?

• Reduction and Oxidation

• Reaction and Oxygen

• Red and Oxide

• Reverse and Oxygen

What happens during oxidation?

• An atom gains electron

• An atom loses electrons

• A substance turns into gas

• An element changes into another

What happens during reduction?

• An atom gains electron

• An atom loses electrons

• An element burns in air

• A gas is released

In a redox reaction, oxidation and reduction occur _______.

• Separately

• At the same time

• Only in metals

• Only in acids

Which of the following is an example of oxidation?

• Rusting of iron

• Boiling water

• Breaking a glass

• Melting ice

In the reaction: Zn + Cu²⁺ → Zn²⁺ + Cu, which element is oxidized?

• Zinc (Zn)

• Copper (Cu)

• Oxygen (O₂)

• Hydrogen (H₂)

In the same reaction: Zn + Cu²⁺ → Zn²⁺ + Cu, which element is reduced?

• Zinc (Zn)

• Copper (Cu²⁺)

• Oxygen (O₂)

• Hydrogen (H₂)

What is an oxidizing agent?

• A substance that gains electrons

• A substance that loses electrons

• A substance that releases gas

• A substance that melts easily

What is a reducing agent?

• A substance that gains electrons

• A substance that loses electrons

• A substance that increases mass

• A substance that becomes solid

Which of the following is an example of a redox reaction?

• Cooking rice

• Burning wood

• Dissolving sugar in water

• Freezing water