Question

step 1 – sketch the lewis structure from the molecular formula, drawing approximate bond angles for each \central\ atom.
step 2 – describe the electron geometry around each central atom, by counting electron groups (bonding plus nonbonding) around the central atom.
step 3 – describe the molecular geometry (shape) around each central atom by counting bonding groups and nonbonding groups separately.
step 4 – predict whether the entire substance is polar or nonpolar. (dont do an internet search!)
step 5 – predict the strongest intermolecular force between two molecules of the substance.
step 6 – predict whether the substance would mix with water. remember \like dissolves like\. is water polar or nonpolar?

molecular formula	sketch lewis structure (with approx. bond angles)	electron geometry	molecular geometry	polar or nonpolar?	strongest intermolecular force	mix with water?
$\ce{ch3f}$	<img src=\https://via.placeholder.com/100x50?text=109.5%c2%b0+c-f\ />	tetrahedral	tetrahedral	polar	dipole - dipole	yes
$\ce{ch2cl2}$	<img src=\https://via.placeholder.com/100x50?text=109.5%c2%b0+c-cl\ />	tetrahedral	tetrahedral	polar	dipole - dipole	yes

Explanation:

Step1: Verify CH₄ entries

Lewis structure: $\ce{H-\underset{\underset{H}{|}}{C}-H}$ (bond angle $109.5^\circ$), electron groups = 4 bonding, 0 lone pairs.
Electron geometry: tetrahedral, molecular geometry: tetrahedral. Symmetric, so nonpolar. Only dispersion forces. Nonpolar does not mix with polar water.

Step2: Verify CH₃F entries

Lewis structure: $\ce{H-\underset{\underset{H}{|}}{C}-F:}$ (bond angle $109.5^\circ$), electron groups = 4 bonding, 0 lone pairs.
Electron geometry: tetrahedral, molecular geometry: tetrahedral. Unequal electronegativity creates dipole, polar. Dipole-dipole forces. Polar mixes with polar water.

Step3: Verify CH₂Cl₂ entries

Lewis structure: $\ce{:\!Cl-\underset{\underset{H}{|}}{C}-Cl:}$ (bond angle $109.5^\circ$), electron groups = 4 bonding, 0 lone pairs.
Electron geometry: tetrahedral, molecular geometry: tetrahedral. Unequal electronegativity creates net dipole, polar. Dipole-dipole forces. Polar mixes with polar water.

Answer:

All entries in the table are verified as correct:

1. For $\ce{CH4}$: Lewis structure (109.5° bond angle), electron geometry = tetrahedral, molecular geometry = tetrahedral, nonpolar, strongest intermolecular force = dispersion, does not mix with water.
2. For $\ce{CH3F}$: Lewis structure (109.5° bond angle), electron geometry = tetrahedral, molecular geometry = tetrahedral, polar, strongest intermolecular force = dipole-dipole, mixes with water.
3. For $\ce{CH2Cl2}$: Lewis structure (109.5° bond angle), electron geometry = tetrahedral, molecular geometry = tetrahedral, polar, strongest intermolecular force = dipole-dipole, mixes with water.