1.
Which of the following is a chemical change?
A.
boiling of water
B.
melting wax
C.
broiling a steak on a grill
D.
condensing water vapor into rainfall
E.
carving a piece of wood


2.
The average distance from Earth to the Sun is 150 megameters. What is that distance in meters?
A.
1.5 × 108 m
B.
1.5 × 106 m
C.
1.5 × 105 m
D.
1.5 × 103 m
E.
1.5 × 10-6 m


3.
The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mi = 1.609 km)
A.
65,500 mi/h
B.
25,300 mi/h
C.
18,200 mi/h
D.
1,090 mi/h
E.
5.02 × 10-3 mi/h


4.
Which of the following is not an S.I. base unit?
A.
meter
B.
ampere
C.
second
D.
gram
E.
kelvin


5.
Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?
A.
387.6 K
B.
355.6 K
C.
323.6 K
D.
190.8 K
E.
–190.8 K


6.
Select the answer that expresses the result of this calculation with the correct number of significant figures.
A.
13.356
B.
13.357
C.
13.36
D.
13.4
E.
13


7.
The appropriate number of significant figures in the result of 15.234 - 15.208 is
A.
1
B.
2
C.
3
D.
4
E.
5


8.
The weight of a coin measured as 1.96235 g on one balance is definitely more accurate than a weight measurement of 1.95 g on another balance.
A. True
B. False


9.
Who is credited with measuring the mass/charge ratio of the electron?
A.
Dalton
B.
Gay-Lussac
C.
Thomson
D.
Millikan
E.
Rutherford


10.
Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, . Select the combination which lists the correct atomic number, number of neutrons, and mass number, respectively.
A.
35, 46, 81
B.
35, 81, 46
C.
81, 46, 35
D.
46, 81, 35
E.
35, 81, 116


11.
Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon.
   Isotope      Isotopic Mass (amu)      Abundance %
   28Si         27.976927         92.23
   29Si         28.976495         4.67
   30Si         29.973770         3.10
A.
29.2252 amu
B.
28.0814 amu
C.
28.0878 amu
D.
28.0855 amu
E.
27.9801 amu


12.
Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride?
A.
BaF2, ionic compound
B.
BaF2, covalent compound
C.
BaF, ionic compound
D.
BaF, covalent compound
E.
Ba2F, ionic compound


13.
What is the name of Na2O?
A.
disodium monoxide
B.
sodium monoxide
C.
sodium dioxide
D.
sodium(I) oxide
E.
sodium oxide


14.
A red glaze on porcelain can be produced by using MnSO4. What is its name?
A.
manganese disulfate
B.
manganese(II) sulfate
C.
manganese(IV) sulfate
D.
manganese sulfate
E.
manganese(I) sulfate


15.
Iron (III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes. What is its formula?
A.
Fe(Cl·6H2O)3
B.
Fe3Cl·6H2O
C.
FeCl3(H2O)6
D.
Fe3Cl(H2O)6
E.
FeCl3·6H2O


16.
What is the name of the acid formed when HBr gas is dissolved in water?
A.
bromic acid
B.
bromous acid
C.
hydrobromic acid
D.
hydrobromous acid
E.
hydrobromidic acid


17.
The compound, P4S10, is used in the manufacture of safety matches. What is its name?
A.
phosphorus sulfide
B.
phosphoric sulfide
C.
phosphorus decasulfide
D.
tetraphosphorus decasulfide
E.
phosphorus sulfide


18.
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. (NA = 6.022×1023)
A.
9.490 × 1025 Cr atoms
B.
2.248 × 1024 Cr atoms
C.
1.124 × 1024 Cr atoms
D.
3.227 × 1023 Cr atoms
E.
1.613 × 1023 Cr atoms


19.
Household sugar, sucrose, has the molecular formula C12H22O11. What is the % of carbon in sucrose, by mass?
A.
26.7 %
B.
33.3 %
C.
41.4 %
D.
42.1 %
E.
52.8 %


20.
A compound, containing chromium and silicon only, contains 73.52 mass percent chromium. Determine its empirical formula.
A.
CrSi3
B.
Cr2Si3
C.
Cr3Si
D.
Cr3Si2
E.
Cr2S


21.
Balance the following equation for the combustion of benzene:
C6H6(l)    +    O2(g)    →    H2O(g)    +    CO2(g)
A.
C6H6(l)    +    9O2(g)    →    3H2O(g)    +    6CO2(g)
B.
C6H6(l)    +    9O2(g)    →    6H2O(g)    +    6CO2(g)
C.
2C6H6(l)    +    15O2(g) →    6H2O(g)    +    12CO2(g)
D.
C6H6(l)    +    15O2(g)    →     3H2O(g)    +    6CO2(g)
E.
2C6H6(l)    +    9O2(g)    →     6H2O(g)    +    12CO2(g)


22.
Ammonia, an important source of fixed nitrogen that can be metabolized by plants, is produced using the Haber process in which nitrogen and hydrogen combine.
N2(g)    +    3H2(g)    →    2NH3(g)
How many grams of nitrogen are needed to produce 325 grams of ammonia?
A.
1070 g
B.
535 g
C.
267 g
D.
178 g
E.
108 g


23.
Magnesium reacts with iron(III) chloride to form magnesium chloride (which can be used in fireproofing wood and in disinfectants) and iron.
3Mg(s)    +    2FeCl3(s)    → 3MgCl2(s)    +    2Fe(s)
A mixture of 41.0 g of Mg (M = 24.31 g/mol) and 175 g of FeCl3 (M = 162.2 g/mol) is allowed to react. What mass of MgCl2 (M = 95.21 g/mol) is formed?
A.
68.5 g MgCl2
B.
77.0 g MgCl2
C.
71.4 g MgCl2
D.
107 g MgCl2
E.
154 g MgCl2


24.
What is the percent yield for the reaction
PCl3(g)    +    Cl2(g)    →    PCl5(g)
if 119.3 g of PCl5 (M = 208.2 g/mol) are formed when 61.3 g of Cl2 (M = 70.91 g/mol) react with excess PCl3?
A.
195%
B.
85.0%
C.
66.3%
D.
51.4%
E.
43.7%


25.
How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (M = 84.02 g/mol)?
HCl(aq)   +    NaHCO3(s)    →    NaCl(s)    +    H2O(l)    +    CO2(g)
A.
638 mL
B.
572 mL
C.
536 mL
D.
276 mL
E.
175 mL


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