Multiple Choice
Which of the following is a false statement about dispersion forces?
13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
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Which of the following statements about viscosity is true?
A
Viscosity increases with increasing temperature.
B
Viscosity is affected by molecular geometry.
C
Molecules with only dispersion forces have higher viscosity than those that can hydrogen bond.
D
Viscosity is unrelated to molar mass.
Verified step by step guidance1
Understand that viscosity is a measure of a fluid's resistance to flow. It is influenced by intermolecular forces and molecular structure.
Recognize that viscosity generally decreases with increasing temperature because higher temperatures provide more energy to overcome intermolecular forces.
Consider the role of molecular geometry: molecules with complex or elongated shapes may have higher viscosity due to increased surface area for intermolecular interactions.
Evaluate the types of intermolecular forces: molecules with hydrogen bonding typically have higher viscosity than those with only dispersion forces due to stronger intermolecular attractions.
Acknowledge that viscosity can be related to molar mass, as larger molecules often have higher viscosity due to increased surface area and stronger dispersion forces.
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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
