A crude oil fraction refers to a group of hydrocarbons with what characteristic?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

A crude oil fraction refers to a group of hydrocarbons with what characteristic?

Explanation:
The main idea is that a crude oil fraction is defined by having hydrocarbons that boil within a similar temperature range. In fractional distillation, the oil is heated and vapors rise through a column; compounds with lower boiling points rise higher before condensing, while those with higher boiling points condense lower down. A fraction is collected within a narrow temperature window, so it contains hydrocarbons whose boiling points are alike. Density or reactivity can vary among the molecules in the fraction, but the defining feature is the similar boiling points.

The main idea is that a crude oil fraction is defined by having hydrocarbons that boil within a similar temperature range. In fractional distillation, the oil is heated and vapors rise through a column; compounds with lower boiling points rise higher before condensing, while those with higher boiling points condense lower down. A fraction is collected within a narrow temperature window, so it contains hydrocarbons whose boiling points are alike. Density or reactivity can vary among the molecules in the fraction, but the defining feature is the similar boiling points.

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