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Ch.11 - Liquids and Intermolecular Forces
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.11 - Liquids and Intermolecular ForcesProblema 6b
Capitolo 11, Problema 6b

The molecules
have the same molecular formula (C3H8O) but different chemical structures. (b) Which molecule do you expect to have a larger dipole moment? [Sections 11.2 and 11.5]

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Step 1: Identify the molecules. The molecular formula C3H8O could represent several different molecules, such as propanol or methoxyethane. The structure of these molecules will determine their polarity and thus their dipole moment.
Step 2: Draw the Lewis structures of the molecules. This will help you visualize the distribution of electrons in the molecule and identify any polar bonds.
Step 3: Determine the polarity of the molecules. A molecule is polar if it has polar bonds and is not symmetrical. A polar molecule will have a larger dipole moment than a nonpolar molecule.
Step 4: Compare the dipole moments. The molecule with the more polar bonds and less symmetry will have the larger dipole moment.
Step 5: Remember that the dipole moment is a vector quantity. It depends not only on the magnitude of the individual bond dipoles but also on their direction. If the bond dipoles do not cancel each other out, the molecule will have a net dipole moment.

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Molecular Formula vs. Structural Isomers

Molecular formulas represent the types and numbers of atoms in a molecule, but they do not convey how those atoms are arranged. Structural isomers are compounds that share the same molecular formula but differ in the connectivity of their atoms, leading to different chemical and physical properties. Understanding this distinction is crucial for analyzing how structural differences can affect molecular behavior.
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Molecular Formula

Dipole Moment

The dipole moment is a measure of the separation of positive and negative charges in a molecule, indicating its polarity. It is influenced by the molecular geometry and the electronegativity of the atoms involved. Molecules with significant differences in electronegativity between bonded atoms and asymmetrical shapes typically exhibit larger dipole moments, making this concept essential for predicting molecular interactions.
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Dipole Moment

Electronegativity and Molecular Geometry

Electronegativity refers to the ability of an atom to attract electrons in a bond, which affects the distribution of electron density in a molecule. The geometry of a molecule, determined by the arrangement of its atoms, influences how these charges are distributed. Together, electronegativity and geometry help predict the overall dipole moment, as asymmetrical arrangements of polar bonds can lead to a net dipole.
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Molecular Geometry with Two Electron Groups
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If 42.0 kJ of heat is added to a 32.0-g sample of liquid meth-ane under 1 atm of pressure at a temperature of -170°C, what are the final state and temperature of the methane once the system equilibrates? Assume no heat is lost to the surroundings. The normal boiling point of methane is -161.5 °C. The specific heats of liquid and gaseous methane are 3.48 and 2.22 J/g-K, respectively. [Section 11.3]

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The phase diagram of a hypothetical substance is

(b) What is the physical state of the substance under the following conditions? (i) T = 150 K, P = 0.2 atm; (ii) T = 100 K, P = 0.8 atm; (iii) T = 300K, P = 1.0atm. [Section 11.6]

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Using this graph of CS2 data, determine (a) the approximate vapor pressure of CS2 at 30°C,

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At three different temperatures, T1, T2, and T3, the molecules in a liquid crystal align in these ways:

(a) At which temperature or temperatures is the substance in a liquid crystalline state? At those temperatures, which type of liquid crystalline phase is depicted?

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