28 . The properties of light can best be explained by assuming that light is composed of:
I. Particles
II. Waves
III. Atoms
(A) I only
(B) II only
(C) I and II
(D) II and III
(E) I, II, and III
29 . Which of the following aqueous solutions would have a pH greater than 7.0?
(A) 1.0 M HCl
(B) 0.5 M NH 4 Cl
(C) 0.25 M HCN
(D) 0.1 M KCN
(E) 1.0 M H 2 SO 4
30 . Avogadro’s number is NOT equal to:
(A) the number of atoms in 11.2 L of O 2 at STP
(B) the number of atoms in 1 mole of He at STP
(C) the number of electrons in 96,500 coulombs
(D) the number of ions in 1 L of 0.5 M sulfuric acid
(E) None of the above
31 . Which of the following is NOT a state function?