Chemistry Fall Semester Practice Exam 3
Name_______________________________
Write the letter for the correct answer to the following questions on the provided answer sheet.
****Remember that 2.54 cm = 1 in.
1.
2.
4.999326 x 102
c. .0500
Expand the following number:
a. 0.04999326
b. 500.
d. 499.9326
Express the following number in scientific notation:
326,844,030,000
11
11
a. 3.27 x 10
b. 3.2684403 x 10
c. 3.27 x 10 11
d. 3.2684403 x 1011
−
−
For questions 3 and 4 , choose from the following answers:
a. 3.25794 x 10 19
e. 3.26 x 10 19
b. 3.25794 x 104
f. 3.26 x 104
32
c. 3.25794 x 10
g. 3.26 x 10 32
d. 3.25794 x 101
h. 3.26 x 101
−
−
−
−
3.
Complete the following conversion:
3.25794 x 10 14 Mm = ??? nm
4.
Complete the following conversion:
3.25794 x 10 18 ps = ??? hs
5.
Determine the number of significant digits in the following number:
a. 5
b. 9
c. 7
d. 2
6.
Determine the number of significant digits in the following number:
1,250,090,000
a. 4
b. 6
c. 8
d. 10
7.
Determine the number of significant digits in the following number:
a. 5
b. 3
c. 2
d. 4
1.090 x 104
8.
Determine the number of significant digits in the following number:
a. 7
b. 5
c. 4
d. 3
1.004070
9.
What is the molar mass of manganese to three significant digits?
a. 24.0
b. 54.9
c. 55.0
−
−
0.00040300
d. 24.3
10.
The atomic number and atomic mass, respectively, for thallium, are:
a. 90, 232
b. 81, 204
c. 73, 181
d. 51, 122
11.
What is the charge of an ion with 54 electrons, 57 neutrons, and 51 protons?
a. +3
b. +6
c. −3
d. −6
12.
A sample of a metal weighs 79,600 cg. The density of this metal is 8.57 g/cm3. The
volume of the metal in cm3 is the same as its molar mass in g/mol. What is the element?
a. Nb
b. Be
c. Se
d. Ga
13.
14.
15.
The elements of Group 2 are called _____.
a. Halogens
b. Alkali Metals
c. Alkaline Earth Metals
d. Noble Gases
Classify arsenic as a metal, nonmetal, or metalloid.
a. Metal
b. Nonmetal
c. Metalloid
d. Medal
The element in group 4 and period 5 of the periodic table is
a. Zr
b. V
c. Hf
d. Nb
16.
A sample of a substance has a volume of 215 cm3 and a density of 4.50 g/cm3, what is its mass?
a. 968 g
b. 47.8 g
c. 0.0209 g
d. 220. g
17.
What is the mass number for an element with 28 protons and 36 neutrons?
a. 8
b. −64
c. −8
d. 64
18.
Classify selenium as a metal, a nonmetal, or a metalloid.
a. metal
b. nonmetal
c. metalloid
19.
d. medal
What is the velocity (m/s) of a wave whose frequency is 15.4 Hz and wavelength is 8.05 nm?
a. 1.91 x 109
b. 1.91 x 100
c. 5.23 x 10 10
d. 1.24 x 10 7
−
−
20.
Describe the type of change that is occurring while water freezes.
a. chemical
b. scientific
c. physical
d. matter
21.
Describe the type of change that is occurring while charcoal is burning.
a. chemical
b. scientific
c. physical
d. matter
22.
Sodium is a member of the ________ family.
a. alkaline earth metal b. alkali metal
c. halogen
23.
d. noble gas
Many Web designers have gotten into the bad habit of using point sizes to define their font
sizes on the screen. But points are a print unit of measure, and the Web is usually viewed on the
screen. This means that when you specify 14-point type, it might display much larger or
smaller than you expect. The most common place this is noticed is between Macintosh and
Windows. Macintosh typically displays things almost 25% smaller than the same page on
Windows. What would a printed font measure if it was specified to be 7.0 point?
(1 pica = 12 point and 1 inch = 6 pica)
a. 2.5 x 10 5 hm
b. 9.7 x 10 2 hm
c. 2.5 x 10 1 hm d. 9.7 x 10 6 hm
−
−
−
−
24.
Classify the following reaction:
Butane (C4H10) is burned in air.
a. Synthesis
d. Double Displacement
b. Decomposition
e. Combustion
c. Single Displacement
25.
The alpha emission of thorium-238 produces:
a. U-242
b. Pa-238
c. Ac-238
d. Ra-234
26.
The following reaction is used to produce a phosphorus vapor for use in the production of
phosphoric acid.
Ca5F(PO4)3 + SiO2 + C → CaSiO3 + CaF2 + CO2 + P4
The SUM of the coefficients of the balanced reaction is:
a. 30
b. 38
c. 59
d. 75
27.
Complete and balance the following reaction:
Zinc is reacted with antimony (V) thiocyanate
a. 5 Zn + 2 Sb(SCN)5 → 5 Zn(SCN)2 + 2 Sb
b. 5 Zn + 2 Sn(SCN)5 → 5 Zn(SCN)2 + 2 Sn
c. 5 Zn + 2 Sb(CN)5 → 5 Zn(CN)2 + 2 Sb
d. 5 Zn + 2 Sn(CN)5 → 5 Zn(CN)2 + 2 Sn
28.
Choose the correct abbreviated electron configuration for gold.
a. [Xe] 6s25d94f14
b. [Kr] 5s24d53f14
c. [Kr] 5s24d9
d. [Xe] 6s25d9
29.
Justin completed the lab to determine the percentage of oxygen in a chlorate. His calculations
from his lab work showed that his chlorate contained 35.6% oxygen. Mrs. Mullins said that his
sample should have contained 39.2% oxygen. What was Justin's percent error?
a. −9.2%
b. 9.2%
c. 10.1%
d. −10.1%
30.
Saccharin, the most common artificial sweetener, has the formula, C7H5NO2S. How much does
a sample of saccharin weigh that contains 4.43 x 1026 oxygen atoms?
a. 6.14 x 104 g
b. 2.46 x 1051 g
c. 1.23 x 105 g
d. 2.23 x 1052 g
31.
Sarin, a chemical warfare agent, was first produced in World War II by the Germans. It
contains 34.3% carbon, 7.2% hydrogen, 22.8% oxygen, 22.1% phosphorus, and 13.6 %
fluorine. What is the empirical formula for Sarin?
a. C3H7O2PF
b. C4H10O2PF2
c. C4H10O2PF
d. C3H7O3P2F
32.
Complete and balance the following reaction:
Mercury (I) hypoiodite is reacted with magnesium phosphate
a. 6 HgIO + Mg3(PO4)2 → 2 Hg3PO4 + 3 Mg(IO)2
b. 3 Hg2(IO)2 + Mg3(PO4)2 → (Hg2)3(PO4)2 + 3 Mg(IO)2
c. 6 HgIO4 + Mg3(PO4)2 → 2 Hg3PO4 + 3 Mg(IO4)2
d. 3 Hg2(IO4)2 + Mg3(PO4)2 → (Hg2)3(PO4)2 + 3 Mg(IO4)2
33.
A nuclear reaction occurs in which uranium-238 is bombarded with 17 neutrons. The results of
this reaction are eight beta particles and a certain isotope. This isotope is:
a. Po-255
b. Fm-255
c. Md-238
d. Ho-238
34.
Amoxicillin (C16H19N3O5S), a broad-spectrum antibiotic, will kill a large variety of bacteria.
What is the percentage of nitrogen by mass in amoxicillin?
a. 11.5%
b. 3.83%
c. 17.3%
d. 6.82%
35.
July's birthstone is the ruby. The chemical name for a ruby is aluminum oxide. If about 1% of
the aluminum ions are replaced by chromium (III) ions, the crystal is a ruby. A ruby is red
because the presence of the chromium (III) causes light in the blue end of the spectrum to be
absorbed. The ruby-red light is passed through the crystal. Chromium (III), the color-causing
impurity, is called a chromophore. The correct formula for aluminum oxide is:
a. AlO
b. Al3O2
c. Al2(O2)3
d. Al2O3
36.
The beta emission of cobalt-60 produces:
a. Fe-60
b. Cu-64
37.
c. Ni-60
d. Mn-56
DDT, an insecticide that was banned in the United States in 1973, nearly wiped out several
species of birds due to interference of this product in the formation of egg shells. The chemical
formula for DDT is C14H9Cl5. How many chlorine atoms are contained in a 50.0 gram
sample of DDT?
a. 4.24 x 1023 g
b. 1.17 x 10 24 g
c. 1.47 x 1027 g
d. 4.15 x 10 22 g
−
−
38.
A common component of deodorant is aluminum chloride hexahydrate. What percentage of
water does this compound contain?
a. 52.4%
b. 44.7%
c. 48.6%
d. 63.3%
39.
Complete and balance the following reaction:
Bromic acid is reacted with nickel (III) hydroxide
a. 3 HBrO2 + Ni(OH)3 → Ni(BrO2)3 + 3 H2O
b. 3 HBrO3 + Ni(OH)3 → Ni(BrO3)3 + 3 H2O
c. 3 HBrO + Ni(OH)3 → Ni(BrO)3 + 3 H2O
d. 3 HBr
+ Ni(OH)3 → NiBr3
+ 3 H2 O
40.
Sphalerite is a mineral whose chemical composition is zinc sulfide. The correct formula for
zinc sulfide is:
a. ZnS
b. ZnSO4
c. ZnSO3
d. Zn(SO4)2
41.
March's birthstone is the aquamarine. The chemical make-up of an aquamarine is
Be3Al2Si6O18. This is the same formula as May's birthstone, the emerald. The only differences
are the chromophores. What is the percentage of aluminum in these gemstones?
a. 5.02%
b. 6.12%
c. 10.0%
d. 33.7%
42.
Choose the correct electron configuration for lanthanum.
a. 1s22s22p63s23p64s23d104p65s24d105p66s25d14f1
b. 1s22s22p63s23p64s23d104p65s24d105p66s25d74f14
c. 1s22s22p63s23p64s23d104p65s24d105p66s25d7
d. 1s22s22p63s23p64s23d104p65s24d105p66s25d1
43.
Groups 3 through 12 are filling ________ orbitals.
a. s
b. p
c. d
d. f
44.
What is the molar mass of palladium (IV) carbonate?
a. 452 g/mol
b. 351 g/mol
c. 346 g/mol
45.
Classify the following reaction:
PbCl4 + 6 O2 → Pb(ClO3)4
a. Synthesis
d. Double Displacement
b. Decomposition
e. Combustion
c. Single Displacement
46.
What is the molar mass of trioctylamine, C24H51N?
a. 450. g/mol
b. 354 g/mol
c. 210. g/mol
d. 226 g/mol
d. 76.0 g/mol
47.
2,3-dihydroxy propanal has a molar mass of 90.1 g/mol. It contains 40.0% carbon, 6.7%
hydrogen, and 53.3% oxygen. What is the molecular formula for 2,3-dihydroxy propanal?
a. C3H6O3
b. CH2O
c. C2H2O4
d. C4H8O4
48.
The following reaction occurs in the process of using lime from oyster shells, methane from
natural gas, and electricity to produce magnesium from sea water.
Cl2 + CH4 + O2 → CO + HCl
The SUM of the coefficients of the balanced reaction is:
a. 9
b. 18
c. 34
d. 17
49.
Using the following conversions, calculate the number of cab in 16.8 quarts.
18 cab = 1 ephah
2 lethek = 1 cor
1 peck = 8 quarts
5 ephah = 1 lethek
1 bushel = 4 peck
1 lethek = 3 bushels
4
a. 1.61 x 10
b. 15.8
c. 504
d. 25.2
50.
What is the coefficient of oxygen in the balanced reaction? C5H12 + O2 → CO2 + H2O
a. 8
b. 6
c. 4
d. 3
Merry Christmas! ö