What is the difference between trigonal pyramidal molecular shape vs. trigonal planar molecular shape? Why does the bond angle change between these molecular shapes when they both
include 3 attached atoms?

Explained below.

Explanation:

- The difference in shape is that in the form of 3D view, trigonal planar resembles a flat triangle, while trigonal pyramidal looks like a pyramid.

- For trigonal planar, the bond angle is 120°, whereas in trigonal pyramidal, the bond angle is 107°. This lesser in trigonal pyramidal due to the lone pair that subdues the bonding pairs that are hybridized whereas in trigonal planar, there is no lone pair.

idk

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.