True or false 1. Intermolecular forces are weaker than ionic and covalent bonds.
ID: 504185 • Letter: T
Question
True or false
1. Intermolecular forces are weaker than ionic and covalent bonds. Answer: _______________
2. For molecules with similar size and molar mass, those with higher polarity would have lower boiling point. Answer: _______________
3. Ion-dipole forces exist between ionic lithium chloride and polar water.
Answer: _______________
4. Ion-dipole forces exist between ionic sodium chloride and ethanol because ethanol is nonpolar.
Answer: _______________
5. Instantaneous dipoles exist in all molecules and atoms. Answer: _______________
6. The strength of dispersion forces depends on the molar mass but the shape of the molecules have no effect on dispersion forces. Answer: _______________
7. Ice has a lower density than water because ice has an ordered cage like structure.
Answer: _______________
8. Liquids with weaker intermolecular interactions have higher viscosity. Answer: _______________
9. Viscosity increases with increasing temperature. Answer: _______________
10. For any molecules, the heat of vaporization is always higher than the heat of fusion because it takes more energy to make molecules to move past one another in a solid lattice. Answer: _______________
Explanation / Answer
Intermolecular forces are weaker than ionic and covalent bonds. Answer: True
2. For molecules with similar size and molar mass, those with higher polarity would have lower boiling point. Answer: False
3. Ion-dipole forces exist between ionic lithium chloride and polar water.
Answer:True
4. Ion-dipole forces exist between ionic sodium chloride and ethanol because ethanol is nonpolar.
Answer: False
5. Instantaneous dipoles exist in all molecules and atoms. Answer: True
6. The strength of dispersion forces depends on the molar mass but the shape of the molecules have no effect on dispersion forces. Answer: True
7. Ice has a lower density than water because ice has an ordered cage like structure.
Answer:True
8. Liquids with weaker intermolecular interactions have higher viscosity. Answer: False
9. Viscosity increases with increasing temperature. Answer: False
10. For any molecules, the heat of vaporization is always higher than the heat of fusion because it takes more energy to make molecules to move past one another in a solid lattice. Answer: true
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