Explanation Intermolecular forces are the forces which are present between the atoms or molecules. The strength of the force acting between the molecules decides which phase the substance is going to exist in. Types of forces existing in a molecule or atom are ionic bonding, metallic bonding, covalent bonding, hydrogen bonding, dipole-dipole interactions and London dispersion forces. The ionic bonding, metallic bonding and covalent bonding are strong whereas hydrogen bonding, dipole-dipole interactions and London dispersion forces are weak. Hydrogen bonding: Hydrogen bond is formed by electronegative atom such as nitrogen, oxygen and fluorine with hydrogen. 1. He London dispersion forces result from non-permanent dipoles. The molecule with same size generally have this these types of forces. Helium atoms are held together by London dispersion forces. In Helium atoms instantaneous dipole are created due to fluctuations in the electron cloud, so that transient, constantly appearing and disappearing forces are generated. This results in London dispersion forces. 2. HBr The nature of intermolecular forces acting between the HBr molecules are found to be dipole-dipole attraction. This is interaction between a partially negative portion of one molecule and a partially positive portion of another molecule. This type of interaction occurs usually in polar molecules. HBr is a covalent molecule with a permanent net dipole moment due to the electronegative Br atom. So the intermolecular force acting between the molecules is weak dipole − dipole interaction. 3. SnH 4 London dispersion forces result from non-permanent dipoles

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Chapter 6, Problem 6.108UTC

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To identify: The intermolecular forces acting between He atoms, HBr molecules, SnH4 molecules and CH3−CH2−CH2−OH .

a. Dispersion or London dispersion forces

b. Dipole-dipole interactions

c. Hydrogen bonding

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Chapter 6, Problem 6.107UTC

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The intermolecular forces acting between He atoms, HBr molecules, SnH 4 molecules and CH 3 − CH 2 − CH 2 − OH . a. Dispersion or London dispersion forces b. Dipole-dipole interactions c. Hydrogen bonding

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To identify: The intermolecular forces acting between He atoms, HBr molecules, SnH4 molecules and CH3−CH2−CH2−OH . a. Dispersion or London dispersion forces b. Dipole-dipole interactions c. Hydrogen bonding

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Chapter 6 Solutions

To identify: The intermolecular forces acting between He atoms, HBr molecules, SnH4 molecules and CH3−CH2−CH2−OH .

a. Dispersion or London dispersion forces

b. Dipole-dipole interactions

c. Hydrogen bonding