Chemistry Oxidation and Reduction Quiz

What is the primary function of an oxidizing agent in a chemical reaction?

• To gain electrons and oxidize another substance.
• To lose electrons and reduce another substance.
• To provide energy for the reaction to occur.
• To act as a catalyst in the reaction.

What is another name for a chemical that "makes something happen"? (You learned this in Biology) (1:13)

• acid

• inhibitor
• catalyst

• product

Why does an element try to lose some of its electrons? (2:02)

• To achieve a stable electron configuration.

• To gain more protons in the nucleus.
• To become a noble gas without losing electrons.
• To increase its atomic mass.

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Which of the following best describes a reducing agent? (5:05)

• A reducing agent is a catalyst that speeds up reactions.

• A reducing agent is a substance that accepts electrons.
• A reducing agent gives electrons and reduces another substance.

• A reducing agent is a substance that oxidizes another substance.

In a chemical equation, how can you identify if a substance is being oxidized? (6:19)

• A substance is oxidized if it loses electrons or increases its oxidation state.
• A substance is oxidized if it gains electrons or decreases it's oxidation state

• It depends if the reaction is a single or double replacement reaction.

• A substance is oxidized if it remains unchanged in a reaction.

What happens to the oxidation number of an element that is reduced? (8:30)

• The oxidation number becomes zero.

• The oxidation number increases.
• The oxidation number remains the same.
• The oxidation number decreases.

In the reaction between calcium and chlorine, which element acts as the reducing agent? (8:30)

• Calcium Oxide

• Calcium

• Chlorine
• Calcium Chloride

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When an element gains electrons, what happens to its charge? (10:22)

• The charge of the element becomes positive.
• The charge of the element becomes negative.
• The charge of the element fluctuates randomly.
• The charge of the element remains neutral.

When analyzing a complex chemical equation, why is it important to consider the entire compound rather than individual atoms? (14:50)

• Individual atoms determine the overall mass of the compound.
• Chemical reactions depend on the interactions and arrangements of atoms within the compound.

• The structure of individual atoms is more important than their arrangement in compounds.
• Chemical reactions are solely based on the number of atoms present.

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In a complex reaction, if H₂S is oxidized, what role does it play? (14:50)

• Oxidizing agent
• Catalyst
• Neutral substance
• Reducing agent