Question detail
Explain how the properties of fractions obtained from fractional distillation of crude oil relate to their chain length and intermolecular forces.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Alkanes
Question
Explain how the properties of fractions obtained from fractional distillation of crude oil relate to their chain length and intermolecular forces.
Answer
Fractions with longer chain lengths have higher boiling points due to stronger van der Waals forces between molecules. As chain length increases, the surface area of the molecules increases, leading to greater intermolecular attraction, which requires more energy to overcome during phase changes.
Explanation
This answer is strong because it directly addresses the relationship between chain length and intermolecular forces, demonstrating an understanding of how these factors influence the physical properties of hydrocarbons. The question tests the student's ability to connect theoretical concepts with practical applications in organic chemistry.
Common mistake
Misunderstanding Fraction Properties
Students often confuse the relationship between chain length and boiling point, thinking that longer chains always have lower boiling points.
To clarify, remember that as chain length increases, the boiling point generally increases due to stronger van der Waals forces. For example, consider the formula for boiling point trends: longer chains lead to increased surface area, which enhances intermolecular forces. Thus, longer alkanes have higher boiling points. Always relate this to the strength of intermolecular forces.
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