5 Steps to a 5 AP Chemistry

308  STEP 5. Build Your Test-Taking Confidence

24.Determine the final temperature of a sample of
hydrogen gas. The sample initially occupied a
volume of 6.00 L at 127°C and 875 mm Hg. The
sample was heated, at constant pressure, until it
occupied a volume of 15.00 L.

(A) 318°C

(B) 727°C

(C) 45°C

(D) 160°C

(E) 1000°C

25.From the following, choose the gas that probably
shows the least deviation from ideal gas behavior.

(A) Kr

(B) CH 4

(C) O 2

(D) H 2

(E) NH 3

Choose from the following types of energy for
questions 26–28.

(A) free energy

(B) lattice energy

(C) kinetic energy

(D) activation energy

(E) ionization energy

26.The maximum energy available for useful work
from a spontaneous reaction

27.The energy needed to separate the ions in an
ionic solid

28.The energy difference between the transition
state and the reactants

1. 2 ClF(g) +O 2 (g) →Cl 2 O(g) +OF 2 (g)
   ΔH°=167.5 kJ


2. 2 F 2 (g) + O 2 (g) →2 OF 2 (g)
   ΔH°=–43.5 kJ


3. 2 ClF 3 (l) +2 O 2 (g) →Cl 2 O(g) +3 OF 2 (g)
   ΔH°=394.1 kJ

29.Using the information given above, calculate the
enthalpy change for the following reaction:

ClF(g) +F 2 (g) →ClF 3 (l)

(A) –135.1 kJ

(B)+135.1 kJ

(C) 270.2 kJ

(D) –270.2 kJ

(E) 0.0 kJ

30.When lithium sulfate, Li 2 SO 4 , is dissolved in

water, the temperature increases. Which of the

following conclusions may be related to this?

(A) Lithium sulfate is less soluble in hot water.

(B) The hydration energies of lithium ions and

sulfate ions are very low.

(C) The heat of solution for lithium sulfate is

endothermic.

(D) The solution is not an ideal solution.

(E) The lattice energy of lithium sulfate is very low.

31.What is the energy required to form a gaseous

cation from a gaseous atom?

(A) ionization energy

(B) kinetic energy

(C) activation energy

(D) lattice energy

(E) free energy

32.C 2 H 4 (g) +H 2 O(g) →C 2 H 5 OH(g)

ΔH=–46 kJ

Determine ΔH for the above reaction if

C 2 H 5 OH(l) was formed in the above reaction

instead of C 2 H 5 OH(g). The ΔHof vaporization

for C 2 H 5 OH is 43 kJ/mol.

(A)+3 kJ

(B)+89 kJ

(C)−3 kJ

(D)+43 kJ

(E)−89 kJ

33.The ground-state configuration of Ni^2 +is which

of the following?

(A) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 4s^2

(B) 1s^2 2s^2 2p^6 3s^2 3p^6 3dl04s^2

(C) ls^2 2s^2 2p^6 3s^2 3p^6 3d^10

(D) ls^2 2s^2 2p^6 3s^2 3p^6 3d^8

(E) ls^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^2

34.A ground-state electron in a calcium atom might

have which of the following sets of quantum

numbers?

(A)n=3; l =2; m 1 =0; ms=−1/2

(B)n=5; l =0; m 1 =0; ms=−1/2

(C)n=4; l =1; m 1 =0; ms=−1/2

(D)n=4; l =0; m 1 =0; ms=−1/2

(E)n=4; l =0; m 1 =+1; ms=−1/2

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