Multiple Choice
Which of the following will have the lowest boiling point?
13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
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In order for a molecule to exhibit dipole-dipole forces, __________ must be present in the molecule.
A
Oxygen
B
a double bond
C
a permanent dipole
D
a C–H bond
E
a functional group
Verified step by step guidance1
Understand the concept of dipole-dipole forces: These are intermolecular forces that occur between polar molecules, which have a permanent dipole moment due to the uneven distribution of electrons.
Identify what causes a permanent dipole: A molecule must have polar bonds and an asymmetrical shape so that the dipoles do not cancel each other out, resulting in a net dipole moment.
Recognize that a permanent dipole is necessary for dipole-dipole interactions: This means the molecule must have regions of partial positive and negative charges.
Evaluate the options given: Oxygen, a double bond, a C-H bond, and a functional group do not inherently guarantee a permanent dipole unless they contribute to an overall polar structure.
Conclude that for dipole-dipole forces to be present, the molecule must have a permanent dipole, which is the correct answer among the options provided.
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Textbook Question
Three identical tubes are filled with different liquids; water, ethylene glycol, and olive oil. A small steel sphere was dropped into the tube, and the time it took to fall to the bottom was recorded. Which property of liquids is responsible for the differences in time for the sphere to fall through the liquid? (LO 11.1)(a) Surface tension(b) Boiling point(c) Viscosity(d) Vapor pressure
