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1) The value of ΔH° for the following reaction is -3351 kJ:
2Al (s) + 3O2 (g) → 2Al2O3 (s)
The value of ΔH°f for Al2O3 (s) is ________ kJ.
A) -3351
B) -1676
C) -32.86
D) -16.43
E) +3351
2) The correct name for the BH4
- ion is ________.
A) borate
B) boride
C) borohydride
D) borite
E) hydroboride
3) Which pair of elements is most apt to form a molecular compound with each other?
A) aluminum, oxygen
B) magnesium, iodine
C) sulfur, fluorine
D) potassium, lithium
E) barium, bromine
4) What is the oxidation state of xenon in XeO2F2?
A) 0
B) +4
C) +8
D) +2
E) +6
5) A solution is made by dissolving 4.92 g of glucose (C6H12O6) in to 165 mL of water.
The molality of this solution is ________ m, if the density of water is 1.00 g/mL.
A) 0.165
B) 0.331
C) 0.0827
D) 29.8
E) 0.00450
6) Which one of the following will change the value of an equilibrium constant?
A) changing temperature
B) adding other substances that do not react with any of the species involved in the
equilibrium
C) varying the initial concentrations of reactants
D) varying the initial concentrations of products
E) changing the volume of the reaction vessel
7) A 0.200 M K2SO4 solution is produced by ________.
A) dilution of 250.0 mL of 1.00 M K2SO4 to 1.00 L
B) dissolving 43.6 g of K2SO4 in water and diluting to a total volume of 250.0 mL
C) diluting 20.0 mL of 5.00 M K2SO4 solution to 500.0 mL
D) dissolving 20.2 g of K2SO4 in water and diluting to 250.0 mL, then diluting 25.0 mL
of this solution to a total volume of 500.0 mL
E) dilution of 1.00 mL of 250 M K2SO3 to 1.00 L
8) Of the following, only ________ is an extensive property.
A) density
B) volume
C) boiling point
D) freezing point
E) temperature
9) In which of the following molecules is hydrogen bonding likely to be the most
significant component of the total intermolecular forces?
A) CH4
B) C5H11OH
C) C6H13NH2
D) CH3OH
E) CO2
10) Which of the following statements is not true for oxygen?
A) The most stable allotrope of oxygen is O2.
B) The chemical formula of ozone is O3.
C) Dry air is about 79% oxygen.
D) Oxygen forms peroxide and superoxide anions.
E) Oxygen is a colorless gas at room temperature.
11) What is the molarity of sodium chloride in solution that is 13.0% by mass sodium
chloride and that has a density of 1.10 g/mL?
A) 143
B) 2.45
C) 2.56
D) 2.23
E) 1.43 x 10-2
12) The electron-domain geometry and molecular geometry of iodine trichloride are
________ and ________, respectively.
A) trigonal bipyramidal, trigonal planar
B) tetrahedral, trigonal pyramidal
C) trigonal bipyramidal, T-shaped
D) octahedral, trigonal planar
E) T-shaped, trigonal planar
