system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it that when atoms bond together, the bonds can form angles?

A water's molecular shape creates a angle of about 109.5 degrees. Why do these molecules have fixed angles, can they not be free to rotate around one another as long as the electrons are still being shared?
gpt
They are actually not fixed.  What you see when you see that water has an angle of 109.5 is actually the equilibrium angle or basically the angle with the lowest energy.  

Now one thing to keep in mind some bonds are far more rigid than others.  single bonds for carbon-hydrogen molecules can be fairly flexible, but if you have a sp2 carbon those bonds tend to be much more rigid due to the double bonding structure.