Intermolecular forces are weaker than tonic and covalent bonds. For molecules wi

Question

Intermolecular forces are weaker than tonic and covalent bonds. For molecules with sJmHar size and molar mass, those with higher polarity would have lower boiling point. Ion-dipole forces exist between ionic lithium chloride and polar water. Ion-dipole forces exist between ionic sodium chloride and ethanol because ethanol is nonpolar. Instantaneous dipole exist in all molecules and atoms. The strength of dispersion forces depends on the molar mass but the shape of the molecules have no effect on dispersion forces. Ice has a lower density than water because ice has an ordered cage like structure. Liquids with weaker intermolecular interactions have higher viscosity. Viscosity increases with increasing temperature. 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.

Explanation / Answer

1) True

Explanation:

2)False.

Explanation:

3) True.

Explanation:

Ion Dipole forces occur in between a fully charged ion and a partially charged dipole.

4)True.

Explanation: The positive Sodium ions are attracted to the negative oxygen atoms of ethanol and hence causes ion dipole forces

5)True

Explanation: The electrons in any atom or molecule are either constant or moving. Sometimes more electrons will be on one side of the atom or molecules than others causing a charge difference.

6)False

Explanation:

7)True

Explanation: Ice is less dense than water because the orientation of H-bonds causes the molecules to push futher apart which lowers the density.

8)False.

Explanation: Liquids with higher intermolecular interactions have higher viscosity.

9) Viscosity of a liquid decreases with increasing temperature whereas viscosity of a gas increases with increasing temperature.

10)True

Explanation: The energy required to completely separate the molecules moving from the liquid to gas ( Vapourization) is much greater than that of separating it from solid to liquid(Fusion).

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