EXAM 4 CHEM 1310 WS09 Key
Version #1
1. (p. 127) Select the classification for the following reaction.
H2(g) + Cl2(g)  2HCl(g)
a. None of these choices is correct.
B. combination
c. displacement
d. acid-base
e. decomposition
Difficulty: E
Silberberg - 004 The... #52
2. (p. 148) A 750-mL sample of hydrogen exerts a pressure of 822 torr at 325 K. What pressure does it exert if the
temperature is raised to 475 K at constant volume?
a. 562 torr
b. 188 torr
c. 1.11  103 torr
D. 1.20  103 torr
e. 1.90  103 torr
Difficulty: E
Silberberg - 005 Gases... #24
3. (p. 151) A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37.0C. How many moles of
nitrogen are in the container?
A. 0.271 mol
b. 3.69 mol
c. 2.27 mol
d. 206 mol
e. 227 mol
Difficulty: E
Silberberg - 005 Gases... #32
4. (p. 142) The air pressure in a volleyball is 75 psi. What is this pressure in torr?
a. 75,000 torr
B. 3900 torr
c. 520 torr
d. 562 torr
e. 7600 torr
Difficulty: E
Silberberg - 005 Gases... #5
5. (p. 127) Select the classification for the following reaction.
2NaCl(l)
2Na(l) + Cl2(g)
A. decomposition
b. combination
c. precipitation
d. acid-base
e. displacement
Difficulty: M
Silberberg - 004 The... #55
6. (p. 149) A sample of oxygen gas has its absolute temperature halved while the pressure of the gas remained
constant. If the initial volume is 400 mL, what is the final volume?
a. 400 mL
b. 20 mL
C. 200 mL
d. 800 mL
e. 133 mL
Difficulty: E
Silberberg - 005 Gases... #19
7. (p. 147) What are the conditions of STP?
a. 0 K and l atm
b. 273.15C and 760 torr
c. 0C and 760 atm
d. None of these choices is correct.
E. 273.15 K and 760 torr
Difficulty: E
Silberberg - 005 Gases... #26
8. (p. 153) Assuming ideal behavior, what is the density of argon gas at STP, in g/L?
A. 1.78 g/L
b. 0.0250 g/L
c. 0.0561 g/L
d. 181. g/L
e. 0.0176 g/L
Difficulty: M
Silberberg - 005 Gases... #34
9. (p. 125) Which one of the following is not a redox reaction?
a. 6FeSO4(aq) + K2Cr2O7(aq) + 7H2SO4(aq) 
Cr2(SO4)3(aq) + 3Fe2(SO4)3(aq) + K2SO4(aq) + 7H2O(l)
b. 2H2(g) + O2(g)  2H2O(l)
c. Cl2(g) + 2KBr(aq)  Br2(l) + 2KCl(aq)
d. Zn(s) + H2SO4(aq)  ZnSO4(aq) + H2(g)
E. H2O(l) + NH3(g)  NH4+(aq) + OH-(aq)
Difficulty: M
Silberberg - 004 The... #41
10. (p. 127) Select the classification for the following reaction.
2Ag+(aq) + Zn(s)  2Ag(s) + Zn2+(aq)
a. acid-base
b. decomposition
c. combination
D. displacement
e. precipitation
Difficulty: M
Silberberg - 004 The... #59
11. (p. 149) A 500-mL sample of argon at 800 torr has its absolute temperature quadrupled. If the volume remains
unchanged what is the new pressure?
a. 200 torr
b. 400 torr
C. 3200 torr
d. 800 torr
e. 2400 torr
Difficulty: E
Silberberg - 005 Gases... #23
12. (p. 119) Predict the product(s) for the following reaction.
H2SO4(aq) + KOH(aq) 
a. No reaction occurs.
B. K2SO4(aq) + H2O(l)
c. K(s) + H2(g) + SO3(g)
d. KSO4(aq) + H2O(l)
e. K2S(aq) + H2O(l)
Difficulty: E
Silberberg - 004 The... #63
13. (p. 127) Select the classification for the following reaction.
2Na(s) + 2H2O(l)  2NaOH(aq) + H2(g)
A. redox
b. combination
c. acid-base
d. None of these choices is correct.
e. precipitation
Difficulty: E
Silberberg - 004 The... #46
14. (p. 149) A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy
if the pressure is increased to 894 torr at constant temperature?
A. 31.2 L
b. 380 L
c. 112 L
d. 22.3 L
e. 44.9 L
Difficulty: E
Silberberg - 005 Gases... #17
15. (p. 148) A carbon dioxide sample weighing 44.0 g occupies 32.68 L at 65C and 645 torr. What is its volume
at STP?
a. 35.2 L
b. 31.1 L
c. 34.3 L
d. 47.7 L
E. 22.4 L
Difficulty: M
Silberberg - 005 Gases... #31
16. (p. 125) Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.
a. +5
b. None of these is the correct oxidation number.
c. -2
d. +2
E. +4
Difficulty: E
Silberberg - 004 The... #35
17. (p. 111) Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and
ammonium phosphate, (NH4)3PO4, are soluble in water. Which one produces the largest number of dissolved
particles per mole of dissolved solute?
a. KCl
b. Na2SO4
c. CO2
d. C6H12O6
E. (NH4)3PO4
Difficulty: E
Silberberg - 004 The... #1
18. (p. 127) Select the classification for the following reaction.
Fe2+(aq) + 2OH-(aq)  Fe(OH)2(s)
a. None of these choices is correct.
B. precipitation
c. acid-base
d. redox
e. decomposition
Difficulty: E
Silberberg - 004 The... #47
Category
# of Questions
Difficulty: E
13
Difficulty: M
5
Silberberg - 004 The...
9
Silberberg - 005 Gases...
9