Question

which substance is a mixture?
○ table salt
○ gasoline
○ aluminum
○ carbon dioxide

Explanation:

• Table salt ($\text{NaCl}$) is a pure compound.
• Gasoline is a mixture of hydrocarbons and additives.
• Aluminum ($\text{Al}$) is a pure element.
• Carbon dioxide ($\text{CO}_2$) is a pure compound.

Only gasoline fits the definition of a mixture.

Answer:

gasoline