According to one acid-base theory, water acts as an acid when an h2o molecule
(1) accepts an h+ (3) accepts an h-
(2) donates an h+ (4) donates an h-

The answer is (2) donates an H+. First, the hydrogen ion is usually positive. Then, the theory means that acid donates an H+ and base donates OH-. So because water molecule can donates an H+, it is an acid.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid