Take a Diagnostic Exam ‹ 21
- Choose the reaction expected to have the greatest
increase in entropy.
(A) N 2 (g) + O 2 (g) → 2 NO(g)
(B) CO 2 (g) → CO 2 (s)
(C) 2 XeO 3 (s) → 2 Xe(g) + 3 O 2 (g)
(D) 2 K(s) + F 2 (g) → 2 KF(s) - A certain reaction is nonspontaneous under
standard conditions but becomes spontaneous
at lower temperatures. What conclusions may be
drawn under standard conditions?
(A) DH > 0, DS > 0, and DG > 0
(B) DH < 0, DS < 0, and DG = 0
(C) DH < 0, DS > 0, and DG > 0
(D) DH < 0, DS < 0, and DG > 0
Chapter 10
- Which of the following groups contains only atoms
that are paramagnetic in their ground state?
(A) Be, O, and N
(B) Mg, He, and Rb
(C) K, C, and Fe
(D) Br, Sb, and Kr - Which of the following could be the electron
configuration of a transition metal ion?
(A) 1s^2 1p^6 2s^2 2p^3
(B) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5
(C) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3
(D) 1s^2 2s^2 2p^5 - Which of the following is the configuration of a
noble gas?
(A) 1s^2 1p^6 2s^2 2p^3
(B) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
(C) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3
(D) 1s^2 2s^2 2p^5 - Which of the following is the electron configura-
tion of a halogen?
(A) 1s^2 1p^6 2s^2 2p^3
(B) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
(C) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3
(D) 1s^2 2s^2 2p^5
35. Which of the following is an impossible electron
configuration?
(A) 1s^2 1p^6 2s^2 2p^3
(B) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
(C) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3
(D) 1s^2 2s^2 2p^5
36. This explains why the exact position of an elec-
tron is not known.
(A) Pauli exclusion principle
(B) Electron shielding
(C) Hund’s rule
(D) Heisenberg uncertainty principle
37. This is why nitrogen atoms, in their ground state,
are paramagnetic.
(A) Pauli exclusion principle
(B) Electron shielding
(C) Hund’s rule
(D) Heisenberg uncertainty principle
38. This means that an atomic orbital can hold no
more than two electrons.
(A) Pauli exclusion principle
(B) Electron shielding
(C) Hund’s rule
(D) Heisenberg uncertainty principle
39. Which of the following explains why the 4s
orbital fills before the 3d?
(A) Pauli exclusion principle
(B) Electron shielding
(C) Hund’s rule
(D) Heisenberg uncertainty principle
40. Magnesium reacts with element X to form an
ionic compound. If the ground-state electron
configuration of X is 1s^2 2s^2 2p^3 , what is the simplest
formula for this compound?
(A) MgX 2
(B) Mg 2 X 3
(C) Mg 3 X 2
(D) MgX