The more acidic the substance is, the more the iron nails will corrode (this obviously depends on what your experiment is but hope this helped in some way)
Hi Sara
I would say it is an amorphous solid.
Because it's gradually loses shape.
I hope that's help:)
It would be called the crest.
Happy to help! Have a great evening.
~Brooke❤️
Na = +1
H = +1
O = -2
Total charge is 0:
1 + 1 + C + 3 x -2 = 0
C = 4