1.
Which of the following is correctly classified as a hypothesis?
A.
"The sun will rise in the East today."
B.
"The Universe was formed from a big bang."
C.
"Our team is better than theirs."
D.
"Cookies will turn brown when baked."
E.
"My book is better than yours."
2.
A compound is:
A.
a pure substance that can be decomposed chemically.
B.
a characteristic that describes a substance.
C.
a pure substance that cannot be decomposed chemically.
D.
a combination of atoms.
E.
none of these.
3.
Which element listed below is
not
classified as a lanthanide or actinide?
A.
Ce
B.
Sm
C.
U
D.
Fr
E.
all are lanthanides or actinides
4.
A precise measurement
A.
is known to two or more significant figures.
B.
is know to two or more decimal places.
C.
is repeatable.
D.
is close to the correct answer
E.
is beyond the scope of a first-year chemistry student.
5.
Properly expressed, the answer to the mathematical manipulation (0.243 x 4.2) + 21.0 = is:
A.
22
B.
22.0
C.
2.2
´
10
2
D.
22.02
E.
2.202
´
10
2
6.
In a new measuring system created by your instructor, 2.16 geb = 1.02 red. How many geb is 7.4 red?
A.
3.5 geb
B.
3.49 geb
C.
15.7 geb
D.
16 geb
E.
1.57 geb
7.
Convert 37°C to kelvins.
A.
288 K
B.
321 K
C.
204 K
D.
310 K
E.
53.3 K
8.
J. J. Thomson used the deflection of electrons by magnetic and electric fields to measure
A.
the volume of the electron.
B.
the mass of the electron.
C.
the charge of the electron.
D.
the mass to charge ratio of the electron.
E.
none of these.
9.
Which type of radioactivity is a high energy electron?
A.
Beta ray
B.
Alpha particle
C.
Gamma ray
D.
x ray
E.
none of these
10.
The symbol for the species that contains 28 protons, 30 neutrons, and 26 electrons is:
A.
58
Ni
2-
B.
30
Ni
2+
C.
56
Ni
2-
D.
58
Ni
2+
E.
none of these
11.
The correct formula of the ionic compound made from barium and chlorine is:
A.
BaCl
B.
Ba
2
Cl
C.
BaCl
2
D.
Ba
2
Cl
2
E.
none of these
12.
The formula mass of K
2
S is
A.
35 u
B.
54 u
C.
71.2 u
D.
110.3 u
E.
155.2 u
13.
The formula of iron (III) sulfide is:
A.
IrS
3
B.
Fe
2
(SO
4
)
3
C.
Fe
3
S
D.
Fe
2
S
3
E.
Ir
3
SO
4
14.
The correct formula of ammonium chloride is:
A.
NH
3
Cl
B.
NH
3
Cl
2
C.
NH
4
Cl
D.
NH
4
Cl
2
E.
none of these
15.
Name the compound XeF
4
.
A.
xenon fluoride
B.
xenon tetrafluoride
C.
xenon difluoride
D.
xenon hexafluoride
E.
none of these
16.
The systematic name of the compound HCN(aq) is
A.
cyanic acid
B.
carbonitric acid
C.
hydrocyanic acid
D.
hydrogen carbonitride
E.
none of these
17.
What is the ratio of a/b where a, b, c, and d represent the coefficients in the balanced equation?
aZn + bH
3
PO
4
®
cH
2
+ dZn
3
(PO
4
)
2
A.
3/1
B.
3/2
C.
6/3
D.
6/5
E.
none of these
18.
The reaction C
2
H
4
+ Cl
2
®
C
2
H
4
Cl
2
is classified as
A.
a neutralization reaction
B.
a combustion reaction
C.
an oxidation-reduction reaction
D.
a precipitation reaction
E.
none of these
19.
What is the oxidation number of the phosphorus in PF
3
A.
+3
B.
-2
C.
-3
D.
+4
E.
none of these
20.
What is the percentage by mass of carbon (to two significant figures) in C
4
H
8
O?
A.
77%
B.
84%
C.
41%
D.
58%
E.
none of these
21.
What is the mass of carbon in 1.33 g of C
2
H
6
?
A.
0.799 g
B.
1.06 g
C.
0.922 g
D.
0.442 g
E.
0.011 g
22.
What is the empirical formula of compound that contains only carbon and hydrogen that is composed of 1.08 g C and 0.136 g H?
A.
CH
3
B.
C
2
H
3
C.
CH
2
D.
CH
E.
none of these
23.
What is the molecular formula of a compound with an empirical formula of CH
3
O and a molar mass of 124 g/mol?
A.
C
2
H
6
O
2
B.
C
4
H
10
O
4
C.
C
3
H
9
O
3
D.
C
4
H
12
O
4
E.
none of these
24.
NH
3
reacts with O
2
to produce NO and H
2
O. How many moles of O
2
are needed to react with exactly 10.0 moles of NH
3
?
A.
8.00 mol
B.
10.0 mol
C.
12.5 mol
D.
20.0 mol
E.
none of these
25.
In the reaction of 16.3 g of C
2
H
4
O with 10.4 g of O
2
, a chemist isolates 2.30 g of H
2
O. What is the percent yield?
A.
17.2 %
B.
34.5 %
C.
23.5 %
D.
49.1 %
E.
55.3 %
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