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Which of the following statements is true regarding the relationship between intermolecular forces and boiling point?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
Scelta multipla
As the strength of intermolecular forces in a substance increases, how are its boiling point, melting point, and viscosity affected?
A
All three properties decrease.
B
All three properties increase.
C
Boiling point and melting point increase, but viscosity decreases.
D
Boiling point decreases, while melting point and viscosity increase.
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Understand that intermolecular forces (IMFs) are the attractions between molecules, which affect how molecules interact and move relative to each other.
Recognize that stronger IMFs require more energy to overcome, so substances with stronger IMFs generally have higher boiling points because more heat is needed to convert the liquid to gas.
Similarly, stronger IMFs also increase the melting point because more energy is needed to break the solid structure into a liquid.
Viscosity, which is a measure of a fluid's resistance to flow, increases with stronger IMFs because molecules stick together more, making it harder for them to move past each other.
Therefore, as the strength of intermolecular forces increases, boiling point, melting point, and viscosity all increase.
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