1st Quarter and 2nd Quarter + a bit of 3rd Quarter
1. Hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in
atmospheres?
2. A sample of an ideal gas has its volume doubled while its temperature remains constant. If
the original pressure was 100 torr, what is the new pressure?
3. A sample of the inert gas krypton has its pressure tripled while its temperature remains
constant. If the original volume is 12 L, what is the final volume?
4. A sample container of carbon monoxide occupies a volume of 435 mL at a pressure of 785
torr and a temperature of 298 K. What would its temperature be if the volume were changed to
265 mL at a pressure of 785 torr?
5. What are the conditions of STP?
6. Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental
conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under
the same condtions. What is the molar mass of the unknown?
7. A gas mixture, with a total pressure of 300 torr, consists of equal masses of Ne (atomic
weight 20), and Ar (atomic weight 40). What is the partial pressure of Ar, in torr?
8. The strongest IMF interactions between ethyl alcohol (CH3CH2OH) molecules arise from?
9. A metal such as chromium in the body-centered cubic lattice will have _____________
atom(s) per unit cell.
10. A metal such as chromium in the face-centered cubic lattice will have ____________
atom(s) per unit cell.
11. A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid
sucrose is now added, with stirring,
A.
the concentration of the solution will increase
B.
the concentration of the solution will decrease
C.
the concentration of the solution will remain the same
D.
the volume of solution will increase
E.
a supersaturated solution will be produced
12. For a given solution, which of the following concentration values will change as temperature
changes?
A.
mass percent
B.
molality
C.
mole fraction
D.
molarity
E.
none of these choices is correct
13. Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared b
dissolving 78.6g of KF in enough water to produce 225 mL of solution.
14. Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.
15. Copper(II) bromide is used as a wood preservative. What mass of CuBr2 is needed to
prepare 750.0 mL of a 1.25 M solution?
16. What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C4H10O, in
425 g of benzene, C6H6?
17. The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water
at 25 degrees C. What is the mole fraction of potassium permanganate in this solution?
18. NaOH is a common ingredient in drain cleaners such as Drano. The mole fraction of NaOH
in a saturated aqueous solution is 0.310. What is the molality of the solution?
19. Colligative properties depend on
A.
the chemical properties of the solute
B.
the chemical properties of the solvent
C.
the masses of the individual ions
D.
the molar mass of the solute
E.
the number of particles dissolved
20. From the following list of aqueous solutions and water, select the one with the lowest
freezing point
A.
0.75 M (NH4)3PO4
B.
1.0 M CaSO4
C.
1.0 M LiClO4
D.
1.5 M methyl alcohol (CH3OH)
E.
pure water
21. Which of the following aqueous solutions will have the lowest osmotic pressure?
A.
0.10 m KOH
B.
0.10 m RbCl
C.
0.05 m CaSO4
D.
0.05 m BaCl2
E.
0.10 m K2SO4
22. Predict the products for the reaction of the following set of reactants.
CaO(s) + H2O (l)  ?
23. Octane is a component of fuel used in internal combustion engines. The dominant
intermolecular forces in octane are
A.
dipole-dipole forces
B.
London dispersion forces
C.
hydrogen bonding
D.
covalent bonds
E.
carbon-hydrogen bonds
24. Which of the following compounds is covalent?
A.
CaCl2
B.
MgO
C.
Al2O3
D.
Cs2S
E.
PCl3
25. CaSe is used in materials which are electron emitters. What is its name?
26. CoCl2 is useful as a humidity indicator because it changes from pale blue to pink as it gains
water from moist air. What is its name?
27. Potassium dichromate, K2Cr2O7, is used in tanning leather, decorating porcelain and water
proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K2Cr2O7.
28. Balance the following equation:
B2O3(s) + HF(l)  BF3(g) + H2O(l)
29. Which of the following is not a redox reaction?
A.
2H2(g) + O2(g)  2H2O(l)
B.
Zn(s) + H2SO4(aq)  ZnSO4(aq) + H2(g)
C.
H2O(l) + NH3(g)  NH4+(aq) + OH-(aq)
D.
6FeSO4(aq) + K2Cr2O7(aq) + 7H2SO4(aq)  Cr2(SO4)(aq) + 3Fe2(SO4)3(aq) +
K2SO4(aq) + 7H2O(l)
E.
Cl2(g) + 2KBr(aq)  Br2(l) + 2KCl(aq)