GENERAL CHEMISTRY 115
FINAL EXAM
SUMMER SESSION 2000
NAME_________________________________
If you are using a programmable calculator you must sit in the center section of the classroom. I will randomly check the
memory in your calculator and if I find any information in the memory you will receive a grade of zero on this exam.
Multiple choice = 3 points each
Other problems = 7 points each
Part I: Chapters 1 through 4
1. Which one of the following numbers contains 6 significant figures?
a) 0.003702
b) 1.003702
c) 4.2010
d) 1000.00
e) none of these
answer is d
2. 20.0 cubic yards is how many cubic meters? 1 inch = 2.54 cm. 1 yard = 3 feet
a) 6.02 m3
b) 2.37 m3
c) 15.3 m3
d) 0.425 m3
e) 98.6 m3
answer is c
3. The barometric pressure in the eye of a hurricane sometimes dips as low as 27.2 inches of mercury. How many
millimeters of mercury is this? answer is c
a) 1.1 mm
b) 6.9 mm
c) 691 mm
d) 107 mm
4. Alcohol has a density of 0.78 g/mL. How many grams of alcohol would it take to fill a 2 fluid ounce shot glass?
1 oz. = 29.6 mL answer is c
a) 59 g
b) 368 g
c) 46 g
d) 122 g
5. Which one of the following is most likely to lose electrons when forming an ion?
a) F
b) P
c) Rh
d) S
e) N
6. Of the choices below, which one is not an ionic compound?
a) PCl5
b) MoCl6
c) RbCl
d) PbCl2
answer is c
answer is a
7. Argon gas has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.0 L of argon gas?
a) 4.7 x 1022
answer is c
25
b) 3.4 x 10
c) 2.1 x 1022
d) 1.5 x 1025
8. A nitrogen oxide (contains only N and O) 63.65% by mass nitrogen might have which molecular formula(s)?
a) NO
answer is c
b) NO2
c) N2O
d) N2O4
e) both NO2 and N2O4
9. What is the molarity of CH3OH in a solution prepared by dissolving 11.7 g of CH3OH in 230 mL of solution?
a) 11.9 M
answer is d
b) 1.59 x 10-3 M
c) 0.0841 M
d) 1.59 M
10. A solid, X, was found to be water soluble. An aqueous solution of this solid evolved bubbles of CO2 when HCl was
added. An aqueous solution of which one of the following salts would form a precipitate when added to an
aqueous solution of X?
answer is b
+
a) K
b) Ag+
c) NH4+
d) Rb+
e) Li+
11. A 28.7 mL sample of KOH required 31.3 mL of 0.118 M HCl to neutralize it. How many grams of KOH were in the
original sample?
answer is d
a) 1.6
b) 7.2
c) 0.17
d) 0.21
12. What are the spectator ions in the reaction between KOH and HNO3?
a) K+ and H+
b) H+ and OHc) K+ and NO3d) H+ and NO313. Which one of the following is not an electrolyte?
a) HCl
b) Rb2SO4
c) Ar
d) KOH
14. How many oxygen atoms are contained in 2.74 g of Al2(SO4)3 ?
a) 12
b) 6.02 x 1023
c) 7.22 x 1024
d) 5.78 x 1022
answer is c
answer is c
answer is d
15. What is the molarity of NaCl in a solution made by mixing 25.0 mL of 0.100 M NaCl with 50.0 mL of 0.100 M NaCl?
a) 0.100 M
answer is a
b) 0.0500 M
c) 0.0333 M
d) 0.0250 M
16. Calculate the number of grams of Al2O3 that could be produced if 2.5 g of aluminum and 2.5 g of oxygen were
allowed to react according to the following balanced equation.
4Al(s) + 3O2 (g) --------> 2Al2O3 (s)
answer is 4.7 g Al2O3
17. A 1.29 g sample of a compound composed of C, H, and O was burned in oxygen. If 1.26 g of CO2 and 0.258 g of
water were produced, what is the simplest formula of the compound? Recall that all of the carbon in the compound shows
up as carbon dioxide and all of the hydrogen in the compound shows up as water.
answer is CHO2
18. Calculate the percent of oxalic acid, H2C2O4, in a solid given that a 0.7984 g sample of that solid required 37.98 mL of
0.2283 M NaOH for titration. First calculate how many grams of oxalic acid reacts with the sodium hydroxide according
to the following reaction: H2C2O4 + 2NaOH = Na2C2O4 + 2H2O
answer is 48.88%