1.Name at least 6 intermolecular forces in increasing strength. For each, give a
ID: 862701 • Letter: 1
Question
1.Name at least 6 intermolecular forces in increasing strength. For each, give an example of a compound having that intermolecular force.
The intermolecular forces should be induced-induced, dipole-dipole, ion-ion, induced-dipole, induced-ion and dipole-ion. Give an example for each one if exist.
2. At 1.0 atm pressure, ice (solid H2O) floats in water instead of sinking. Briefly explain this in terms of intermolecular forces.
3. What is the relationship between (directly, inversely, or not related)
a. Polarity of molecule and strength of intermolecular forces
b. strength of intermolecular forces and vapor pressure
c. vapor pressure and boiling point
d. polarizability and size of molecule
4.Which compound should have the lowest vapor pressure at a temperature at which all these substances are in the liquid state? Briefly explain.
a. CH3--CH2--F b. CH3--CH2--CH3
c. CH3--CH2--CH2--CH3 d. CH3--CH2--O--H
e. CH3--O--CH3
Is this b? explain?
Explanation / Answer
1. Increasing order is
induced dipole-induced dipole < dipole-induced dipole < ion-induced dipole< dipole-dipole< ion-dipole< ion-ion
2. At 1.0 atm pressure, ice (solid H2O) floats in water instead of sinking. Briefly explain this in terms of intermolecular forces.
Due to presence of hydrogen bond in ice it forms cage like strucutre and is less denser than water so occupies more volume and float over it.
3. What is the relationship between (directly, inversely, or not related)
a. Polarity of molecule and strength of intermolecular forces
More polarity more strength
b. strength of intermolecular forces and vapor pressure
More intermolecular strength more vapour pressure
c. vapor pressure and boiling point
High vapour pressure lower boiling point
d. polarizability and size of molecule
Larger the size of anion more the polarizability
4.Which compound should have the lowest vapor pressure at a temperature at which all these substances are in the liquid state? Briefly explain.
a. CH3--CH2--F b. CH3--CH2--CH3
c. CH3--CH2--CH2--CH3 d. CH3--CH2--O--H
e. CH3--O--CH3
lowest vapour pressure and highest boiling point will be of ethanol ( comp d) due to stongest intermolecular interaction ( due to hydrogen bond)
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