1. False, the water being stored behind the dam has potential energy until it begins to flow through the dam (it is then converted to kinetic energy).
2. True
3. True
Hope this helped! :)

. Iron is divalent to hydrogen and water.
Mass is density times volume
0.760 x 531 = 403.56g
404g if 3 sig figs
It is A. Quanta, have a nice day!!