What is the relationship between the intermolecular forces in a liquid and its vapor pressure? The vapor pressure of a liquid remains constant as the strength of its intermolecular forces increases The vapor pressure of a liquid decreases as the strength of its intermolecular forces increases The vapor pressure of a liquid increases as the strength of its intermolecular forces increases

What is the relationship between the intermolecular forces in a liquid and its vapor pressure? The vapor pressure of a liquid remains constant as the strength of its intermolecular forces increases The vapor pressure of a liquid decreases as the strength of its intermolecular forces increases The vapor pressure of a liquid increases as the strength of its intermolecular forces increases

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter8: Molecules And Materials

Section: Chapter Questions

Problem 8.47PAE: 8.47 Answer each of the following questions with increases, decreases, or does not change. (a) If...

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What is the relationship between the intermolecular forces in a liquid and its vapor pressure?
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8.47 Answer each of the following questions with increases, decreases, or does not change. (a) If the intermolecular forces in a liquid increase, the normal boiling point of the liquid _____. (b) If the intermolecular forces in a liquid decrease, the vapor pressure of the liquid ______. (c) lf the surface area of a liquid decreases, the vapor pressure ____. (d) If the temperature of a liquid increases, the equilibrium vapor pressure ______.
What are intermolecular forces? How do they differ from intramolecular forces? What are dipole-dipole forces? How do typical dipole-dipole forces differ from hydrogen bonding interactions? In what ways are they similar? What are London dispersion forces? How do typical London dispersion forces differ from dipole-dipole forces? In what ways are they similar? Describe the relationship between molecular size and strength of London dispersion forces. Place the major types of intermolecular forces in order of increasing strength. Is there some overlap? That is, can the strongest London dispersion forces be greater than some dipole-dipole forces? Give an example of such an instance.
Classify each of the following statements as true or false. a Intermolecular attractions are stronger in liquids than in gases. b Substances with weak intermolecular attractions generally have low vapor pressures. c Liquids with high molar heats of vaporization usually are more viscous than liquids with low molar heats of vaporization. d A substance with a relatively high surface tension usually has a very low boiling point. e All other things being equal, hydrogen bonds are weaker than induced dipole or dipole forces. f Induced dipole forces become very strong between large molecules. g Other things being equal, nonpolar molecules have stronger intermolecular attractions than polar molecules. h The essential feature of a dynamic equilibrium is that the rates of opposing changes are equal. i Equilibrium vapor pressure depends on the concentration of a vapor above its own liquid. j The heat of vaporization is equal to the heat of fusion, but with opposite sign. k The boiling point of a liquid is a fixed property of the liquid. l If you break shatter an amorphous solid, it will break in straight lines, but if you break a crystalline solid, it will break in curved lines. m Ionic crystals are seldom soluble in water. n Molecular crystals are nearly always soluble in water. o The numerical value of heat of vaporization is always larger than the numerical value of heat of condensation. p The units of heat of fusion are kJ/gC. q The temperature of water drops while it is freezing. r Specific heat is conerned with a change in temperature.
You are comparing three different substances, A, B, and C, all liquids and having similar molar masses. The vapor pressure at 25 C for substance A is less than the vapor pressure for B at this temperature. Substance C has the highest boiling point of the three substances. List the three substances A, B, or C in order of the strength of intermolecular forces, from least to greatest.
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