It would be C! An energy change. Usually it changes heat - could be less or more.
I hope all is well, and you pass! Good luck, rockstar! You got this. (:
You may suppose you have a 0.1 M solution of NH3, from:
NH4Cl + NaOH > NH3 + H2O.
Then you can compute the pH from the concentration of NH3 and its pKb.
The concentration is high enough to use the simplified formula:
[OH] = sqr(Kb*conc)
There’s no other degenerate s orbital because the there can be only one s orbital for any value of n.
The answer is C: A surfer rides back to the beach on his surf board.
All the others are examples of people doing stuff to the water, C is an example of the water moving something, in this case the water is moving a surfer and his surf board.