Practice Final A
Supplemental Instruction
Iowa State University
1. Which of the following is not a chemical
change?
a. Dissolving NaCl in water
b. Boiling liquid water into vapor water
c. Combustion of CH4
d. Neutralization of NaOH and HCl
e. Hydrolysis of Na2O to get NaOH
2. ( 8.24 + 3.9 ) x 19.59 =
a. 200
b. 240
c. 237
d. 237.2
e. 237.22
3. Which of the following is Hypobromous acid?
a. HBr
b. HBrO
c. HBrO2
d. HBrO3
e. HBrO4
4. If you have 123.45 mg Sulfuic Acid
(mm=98.1g/mol), how many atoms of
hydrogen are there?
a. .00126
b. .00252
c. 7.58*1020
d. 1.52*1021
e. 7.44*1025
5. If 3.0 moles of sodium react with excess
phosphoric acid, and 2.34 grams hydrogen
gas is formed, what it the percent yield?
6Na(s) + 2H3PO4(aq)  2Na3PO4 (aq) + 3H2(g)
a. 13 %
b. 56%
c. 78%
d. 81%
e. 100%
6. What coefficients are needed to balance the
following reaction?
___CH3OH + ___O2  ___CO2 + ___H2O
a. 1,2,1,2
b. 2,4,2,3
c. 2,3,2,4
d. 1,3,2,4
e. 4,6,4,8
7. Which of the following is not a correct
chemical equation
a. HF(aq)  H+ (aq) + F- (aq)
b. HClO3(aq)  H+ (aq) + ClO3- (aq)
Leader: Grady
Course: Chem 177
Instructor: Kingston
Date:
8.
9.
10.
11.
12.
13.
14.
c. HNO3 (aq)  H+ (aq) + NO3- (aq)
d. HBr (aq)  H+ (aq) + Br- (aq)
107
For Ag2- how many protons neutrons and
electrons are there respectively?
a. 47, 47, 49
b. 47, 50, 47
c. 107, 60, 47
d. 107, 47, 60
e. 47, 60, 49
If the molecular formula of a compound is
C8H4O6Cl2, what is the molar mass of the
empirical compound?
a. 98.7 amu
b. 133.5 amu
c. 155.5 amu
d. 200.1 amu
e. 266.9 amu
What is the ∆Hfor, of Al2O3(s)?
4Al(s) + 6O2 (g)  2Al2O3 (s) ∆H= -456kJ
a. 114 kJ
b. 228 kJ
c. 256 kJ
d. -256 kJ
e. -228 kJ
For the reaction in question 10:
The reaction is _______, which means heat is
_______ from the system?
a. Endothermic, released
b. Endothermic, absorbed
c. Exothermic, released
d. Exothermic,absorbed
In which of the following molecules does
sulfur have the lowest oxidation state?
a. H2S
b. SO
c. H2SO4
d. H4S
How many p orbitals contain electrons filled
in a xenon atom?
a. 12
b. 4
c. 24
d. 8
Which 2 atoms/ions are isoelectronic?
a. As3-, Br1b. P+,Sic. Mg2+, Sd. K+, I-
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15.
16.
17.
18.
19.
20.
21.
22.
e. Mg2+,N2What are the spectator ions in the reaction
NH4NO3 (aq) and BaCO3 (aq)
a. NH4+ and CO32b. Ba2+ and NO3c. NH4+ and NO3d. Ba2+ and CO32e. Both answer a and b
What is the concentration of a solution made
from 15mL of 2.0M HBrO, 20.0 mL of H2O,
and 9.7 g HBrO (mm=97 g/mol) assuming
volumes are additive?
a. 3.7 M
b. 2.3 M
c. 1.8 M
d. 4.1 M
e. 1.2 M
If an atom goes into an excited state, the
electron moves from__and energy is__.
a. n=2 to n=3, emitted
b. n=3 to n=2, emitted
c. n=2 to n=3, absorbed
d. n=3 to n=2, absorbed
If you add 50. mL of water to 40. mL of 3.6 M
NaCH3 what is the concentration?
a. 2.9 M
b. 1.7 M
c. 1.60 M
d. 2.90 M
e. 1.6 M
If you have 6.00 moles of aluminum
(mm=27.0g/mol) at 25oC, and you add 157J
of heat, what is the final temperature?
(Cs=.900 Jg-1K-1)
a. -4.07oC
q=m*Cs*∆T
b. 54.1oC
o
c. 23.9 C
d. 26.1oC
What is the energy of a radio wave from
840 AM? (AM broadcasts in kHz)
a. 5.57 x 10-28 J
c=λν
E=ν*h
b. 2.78 x 10-28 J
8
c=3.00*10
m/s
c. 3.45 x 10-28 J
-34
h=6.626*10 Js
d. 4.86 x 10-28 J
Which of the following is not a correct
electron configuration?
a. 1s22s22p63s23p64s23d104p3
b. 1s22s22p63s23p63d5
c. [Ar]4s2
d. 1s22s22p63s23p84s2
Electronegativity increases as you move ___.
a. Down a group and from left to right
b. Down a group and from right to left
c. Up a group and from left to right
d. Up a group and from right to left
For the next 2 questions use the molecule BrH4123. There are ____ bonding pair(s) of electrons
and _____ lone pair(s) on the molecule?
a. 3,1
b. 3,2
c. 3,3
d. 4,1
e. 4,2
24. What are the bond angles of the molecule?
a. 90o
b. 107o
c. 109.5o
d. 120o
e. 180o
25. Estimate the heat of reaction of the reaction
using the bond energies:
Br2(g)+3F2(g)  2BrF3(g)
Bond Bond Energy
a. -410 kJ
Br-Br 192 kJ/mol
b. -516 kJ
F-F
158 kJ/mol
c. -611 kJ
Br-F
197 kJ/mol
d. -720 kJ
26. Which of the following atoms can support an
expanded octet
a. H
b. C
c. O
d. F
e. Cl
27. If a molecule has 4 bonding electron domains
and 1 lone pair of electrons, what is the
molecular geometry?
a. Bipyrimidal
b. See-Saw
c. Triganol pyramidal
d. Octahedral
28. Which of the following are correct resonance
structures for ozone?
a. I
b. II
c. I and III
d. II and IV
e. IV
29. The following MO shows two ____ orbitals,
making a ____ bond, and it represents _____.
a. s, sigma, antibonding
b. p, pi, antibonding
c. s, pi, bonding
d. p, sigma, bonding