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Intermolecular Forces: Comparing Properties of Key Chemical Compounds
Chapter , Problem 35(choose chapter or problem)
In each of the following groups of substances, pick the one that has the given property. Justify your answer.
a. highest boiling point: HBr, Kr, or \(\rm{C{l_2}}\)
b. highest freezing point: \({\rm{H_2}O}\) , NaCl, or HF
c. lowest vapor pressure at \(25^\circ C\): \(\rm{C{l_2}}\), \(\rm{B{r_2}}\), or \(\rm{{I_2}}\)
d. lowest freezing point: \(\rm{{N_2}}\), CO, or \(\rm{C{O_2}}\)
e. lowest boiling point: \(\rm{C{H_4}}\), \(\rm{C{H_3}C{H_3}}\), or \(\rm{C{H_3}C{H_2}C{H_3}}\)
f. highest boiling point: HF, HCl, or HBr
g. lowest vapor pressure at \(25^\circ C\): \(\rm{C{H_3}C{H_2}C{H_3}}\), 
Questions & Answers
QUESTION:
In each of the following groups of substances, pick the one that has the given property. Justify your answer.
a. highest boiling point: HBr, Kr, or \(\rm{C{l_2}}\)
b. highest freezing point: \({\rm{H_2}O}\) , NaCl, or HF
c. lowest vapor pressure at \(25^\circ C\): \(\rm{C{l_2}}\), \(\rm{B{r_2}}\), or \(\rm{{I_2}}\)
d. lowest freezing point: \(\rm{{N_2}}\), CO, or \(\rm{C{O_2}}\)
e. lowest boiling point: \(\rm{C{H_4}}\), \(\rm{C{H_3}C{H_3}}\), or \(\rm{C{H_3}C{H_2}C{H_3}}\)
f. highest boiling point: HF, HCl, or HBr
g. lowest vapor pressure at \(25^\circ C\): \(\rm{C{H_3}C{H_2}C{H_3}}\),
Step 1 of 8
Physical properties:
The intermolecular forces existing in a pure substance play a vital role in determining the physical properties of matter. These properties are generally vapor pressure, boiling point and freezing point.
Vapor pressure- It depends on the amount of gas vapors present above its liquid. For a substance with high intermolecular forces, the vaporization is low, causing a decrease in vapor pressure.
Freezing and boiling point – Phase change occurs when the atmospheric and vapor pressure becomes equal. When the vapor pressure lowers (high intermolecular force), the phase change requires more energy and freezing and boiling points increase.
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Intermolecular Forces: Comparing Properties of Key Chemical Compounds
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Discover the effects of intermolecular forces on the boiling point, freezing point, and vapor pressure of various compounds. Learn how hydrogen bonding, ionic bonding, and London dispersion forces influence these properties in different groups of molecules.