Answer:
a chemical change is usually an irreversible chemical reaction. an example of this is rusting.
a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.
Explanation:
Bicarbonate, sodium, potassium
are regulated by the kidneys.
"pH = - log[H3O+]
13 = - log[H3O+]
-13 = log[H3O+]
Log[H3O+] = -13
Log10 [H3O+] = -13
10^-13 = [H3O+]
[H3O+] = ?"
