Identify each of the highlighted materials as an element, a compound, or a mixture, and explain your reasoning.

Answer:

Crude oil, gasoline, and kerosene are mixtures because they contain multiple substances. Butane (C₄H₁₀), dodecane (C₁₂H₂₆), octane (C₈H₁₈), and benzene (C₆H₆) are compounds because each contains chemically bonded atoms of different elements. Oxygen (O₂) is an element because it contains only oxygen atoms. Carbon dioxide (CO₂) and water (H₂O) are compounds because each contains more than one element chemically bonded together.