Bond angles are really important when it comes to VSEPR (Valence Shell Electron Pair Repulsion) theory. This theory helps us predict how molecules are shaped.

But a lot of students have a hard time understanding how bond angles change the shapes of molecules.

Here are some reasons why it’s difficult to understand:

• It can be tricky to picture 3D shapes in your mind.
• Many students find it tough to see how lone pairs (which don't bond) change bond angles, compared to bonding pairs (which do bond).

Bond Angle Changes

• There are ideal bond angles, like $120^\circ$ for a shape called trigonal planar.
• However, real bond angles often change. This happens because of lone pairs and a property called electronegativity. This makes it harder to predict shapes.

What Can Help?

• Using molecular model kits or computer programs can help you see these shapes better.
• Practicing with different molecules can really help you understand how bond angles affect molecular shapes.

In short, while bond angles in VSEPR theory are very important, they can be confusing. But with the right tools and some practice, these ideas can become much easier to understand.