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1) Of the following, ΔH°f is not zero for ________.
A) O2 (g)
B) C (graphite)
C) N2 (g)
D) F2 (s)
E) Cl2 (g)
2) C12H26 molecules are held together by ________.
A) ion-ion interactions
B) hydrogen bonding
C) ion-dipole interactions
D) dipole-dipole interactions
E) dispersion forces
3) Which one of the following is most soluble in water?
A) CH3OH
B) CH3CH2CH2OH
C) CH3CH2OH
D) CH3CH2CH2CH2OH
E) CH3CH2CH2CH2CH2OH
4) The mole fraction of nitrogen in dry air near sea level is 0.78084, where the molar
mass of nitrogen is 28.013. The partial pressure of nitrogen when the total atmospheric
pressure (dry air) is 97.5 kPa is ________ kPa.
A) 126
B) 4.51
C) 77.0
D) 2.16 103
E) 2.75
5) Which of these metals is the most easily oxidized?
Na
Au
Fe
Ca
Ag
A) Na
B) Au
C) Fe
D) Ca
E) Ag
6) Molality is defined as the ________.
A) moles solute/moles solvent
B) moles solute/liters solution
C) moles solute/kg solution
D) moles solute/kg solvent
E) none (dimensionless)
7) An aqueous solution of a soluble compound (a nonelectrolyte) is prepared by
dissolving 33.2 g of the compound in sufficient water to form 250 mL of solution. The
solution has an osmotic pressure of 1.2 atm at 25 oC. What is the molar mass (g/mole)
of the compound?
A) 1.0 x 103
B) 2.7 x 103
C) 2.3 x 102
D) 6.8 x 102
E) 28
8) Which one of the following has the smallest radius?
A) Na
B) Al
C) K
D) Ca
9) The oxidation number of As in H2AsO3
- is ________.
A) +1
B) +2
C) +3
D) +4
E) +5
10) Based on the figure above, the boiling point of diethyl ether under an external
pressure of 0.605 atm is ________ oC.
A) 40
B) 10
C) 30
D) 20
E) 0
11) For which one of the following reactions is ΔH°rxn equal to the heat of formation of
the product?
A) N2 (g) + 3H2 (g) → 2NH3 (g)
B) (1/2)N2 (g) + O2 (g) → NO2 (g)
C) 6C (s) + 6H (g) → C6H6 (l)
D) P (g) + 4H (g) + Br (g) → PH4Br (l)
E) 12C (g) + 11H2 (g) + 11O (g) → C6H22O11 (g)
12) Classify the following compounds as weak acids (W) or strong acids (S):
hypochlorous acid
perchloric acid
chloric acid
A) W S S
B) S S S
C) S W W
D) W W W
E) W S W
13) A 30.5 gram sample of glucose (C6H12O6) contains ________ atoms of carbon.
A) 9.17 x 1024
B) 6.12 x 1023
C) 1.70 x 1022
D) 1.69 x 10-24
E) 1.02
14) What is the purpose of adding EDTA to prepared foods?
A) to keep ions such as Ca2+ in solution so the foods look good
B) to complex trace metal ions that catalyze decomposition reactions
C) to complex iron (III) ions so they can catalyze protein decomposition on cooking
D) to aid in browning of the surface during cooking
E) to prevent dissolution of the container in the food when stored for long periods of
time
15) How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?
A) 0.8452
B) 1.183
C) 6.022 x 1023
D) 8.648 x 1023
E) 3.134 x 1025
16) The overall order of a reaction is 2. The units of the rate constant for the reaction
are ________.
A) M/s
B) M-1s-1
C) 1/s
D) 1/M
E) s/M2
17) When the following equation is balanced, the coefficient of water is ________.
K (s) + H2O (l) → KOH (aq) + H2 (g)
A) 1
B) 2
C) 3
D) 4
E) 5
