June 2017 NY Regents Chemistry Exam
20 Distillation of crude oil from various parts of the world yields different percentages of hydrocarbons. Which statement explains these different percentages?
(1) Each component in a mixture has a different solubility in water.
(2) Hydrocarbons are organic compounds.
(3) The carbons in hydrocarbons may be bonded in chains or rings.
(4) The proportions of components in a mixture can vary.
Solution: Distillation is separation of liquids based on their boiling points. Crude oil is a mixture composed of different hydrocarbons. If the proportions of the mixture vary, the % of hydrocarbons will vary as well.
Answer: 4
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