Multiple Choice
Which of the following statements is NOT true about a liquid in a glass capillary that forms a convex meniscus?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
Multiple Choice
Arrange the following compounds in order of increasing boiling point: CH4, NH3, H2O, CO2.
A
CH4 < NH3 < CO2 < H2O
B
CO2 < CH4 < NH3 < H2O
C
CH4 < CO2 < NH3 < H2O
D
NH3 < CH4 < CO2 < H2O
Verified step by step guidance1
Identify the types of intermolecular forces present in each compound: CH4, NH3, H2O, and CO2. Consider whether they exhibit London dispersion forces, dipole-dipole interactions, or hydrogen bonding.
Recall that CH4 (methane) is a nonpolar molecule with only London dispersion forces, which are generally the weakest intermolecular forces.
Recognize that CO2 is a linear, nonpolar molecule with London dispersion forces as well, but it has a larger molar mass than CH4, which can increase the strength of dispersion forces and thus the boiling point.
Note that NH3 (ammonia) is a polar molecule capable of hydrogen bonding due to the presence of N-H bonds, which significantly increases its boiling point compared to nonpolar molecules.
Understand that H2O (water) has strong hydrogen bonding because of its two O-H bonds and bent shape, leading to the highest boiling point among the given compounds.
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