Chemistry Intermolecular Forces Solution: Classify the species given below by the intermolec...

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Solution: Classify the species given below by the intermolecular forces present in a pure sample of each:Ar H2 HCN HF BrCl5 NH3 CH3OH H2S PF5 CH2Cl2Are they dispersion, dipole-dipole, or H-bond?

Problem

Classify the species given below by the intermolecular forces present in a pure sample of each:

Ar H2 HCN HF BrCl5 NH3 CH3OH H2S PF5 CH2Cl2

Are they dispersion, dipole-dipole, or H-bond?

Solution

We’re being asked to identify the intermolecular forces present in each compound. Recall that there are several types of intermolecular forces:


1.  Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F

2. Dipole-dipole interaction – occurs between two polar covalent compounds

3. Dispersion forces – occurs in all compounds. This is the primary intermolecular force exhibited by nonpolar compounds.



For this problem, we need to do the following steps:

Step 1: Determine the central atom in the molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.

Step 4: Determine the polarity and IMF of the molecule.

**we can skip these steps if the molecule is monoatomic/diatomic or has a simple structure



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