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. Butane, dodecane, octane, benzene, carbon dioxide, and water are compounds. Oxygen is an element. Mixtures contain different substances physically combined, compounds contain different elements chemically bonded in fixed ratios, and an element contains only one type of atom.