Question

matter, atomic structure, and the periodic table

which substance is a mixture?

gasoline
table salt
aluminum
carbon dioxide

Explanation:

Define pure substances

Using the Pure Substances knowledge point, pure substances have a constant composition.

Analyze elements and compounds

Using the Elements and Compounds knowledge point, aluminum is an element, while table salt (\(\text{NaCl}\)) and carbon dioxide (\(\text{CO}_2\)) are compounds.

Identify the mixture

Gasoline is a liquid mixture of various hydrocarbons.

Answer:

• gasoline (Correct answer)
• table salt
• aluminum
• carbon dioxide