All mixtures contain only one kind of atom.
~Mschmindy
Answer:
1 is the same 3 is pure substance 4 is different
Explanation:
not sure about 2
pOH = -LOG([OH])
pOH = -LOG(4.5*10^-9)
pOH = 8.34
pH + pOH = 14
pH = 14 - 8.34 = 5.65
hope this helps!
(:
The answer is D.
