AnswersISP ONLY Chemistry S1 Q3000XXElements, Compounds, and Mixtures

Elements, Compounds, and Mixtures Answers

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1
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Considering the passage about crude oil, why is distillation the main process for separating the contents of crude oil?

A
Crude oil is a homogeneous mixture.
B
Crude oil is a heterogeneous mixture
C
A major byproduct of crude oil is gasoline.
3

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.

7

Considering the passage about crude oil, why is distillation the main process for separating the contents of crude oil?

A
Crude oil is a homogeneous mixture.
B
Crude oil is a heterogeneous mixture
C
A major byproduct of crude oil is gasoline.
8

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.

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