Ch.11 - Liquids, Solids & Intermolecular ForcesWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Compare the viscosity of neopentane, (CH3)4C, and n-pentane.

Solution: Compare the viscosity of neopentane, (CH3)4C, and n-pentane.


Compare the viscosity of neopentane, (CH3)4C, and n-pentane.

A model shows n-Pentane (C5H12), which is a linear chain of carbon and hydrogen. Its boiling point is 309.4 Kelvin. Linear molecules have larger surface area that enhances intermolecular contact and increases dispersion force.Neopentane has the same structural formula has n-Pentane (C5H12), but it has a spherical shape and a lower boiling point (282.7 Kelvin). In spherical molecules, smaller surface area diminishes intermolecular contact and decreases dispersion force.


Recall: Viscosity is the resistance of a fluid to flow. Generally, viscosity increases with:

– decreasing temperature
– increasing molar mass
– stronger intermolecular forces

Neopentane and n-pentane are isomers, compounds with the same molecular formula but different structure. They both have the same molecular formula, C5H12. This means we can ignore their molar mass when comparing viscosity.

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