Ch.11 - Liquids, Solids & Intermolecular ForcesSee 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: Under standard conditions, neopentane is a gas while n-pentane is a liquid. Given that both are non-polar and have identical chemical formulas (C5H12), the reason that n-pentane has a higher boiling point is that 1. it has more H-bonding than the neopentane. 2. it has more C-H bonds that are slightly polar. 3. its straight-chain structure allows for a substantial permanent dipole. 4. its straight-chain structure allows the molecules to have more instantaneous dipoles interacting at close distances. 5. n-pentane has more valence electrons and therefore can form more instantaneous dipoles.

Problem

Under standard conditions, neopentane is a gas while n-pentane is a liquid.

Given that both are non-polar and have identical chemical formulas (C5H12), the reason that n-pentane has a higher boiling point is that

1. it has more H-bonding than the neopentane.

2. it has more C-H bonds that are slightly polar.

3. its straight-chain structure allows for a substantial permanent dipole.

4. its straight-chain structure allows the molecules to have more instantaneous dipoles interacting at close distances.

5. n-pentane has more valence electrons and therefore can form more instantaneous dipoles.