INSTRUCTOR~
"1pledge my honor thml
"fIVe abided by the Stevens Honor System
(signed)
QuestioB 26 BONUS PROBLEM 10 points for perfect answer
Questions 1-25 4 points eadI;
1. A scientist obtains the number 0.045006700 on a calculator. Ifthis number actually has four (4)
significant figures, how should it be written?
A) 0.4567
B) 0.4501
q
~
0.045
0.04500
®O.0450l::
2. Using the rules of significant figures, calculate the following:
6.167 +81
5.10
A) 17.1
)
17
ID... 18
Lt LJ
©)17
0
t::5 \ I 0 0 0 ')
D) 98
E) 17.09
\
I~
Ie"
3. ill 1928,34.0 g ofa new element was isolated from 660 kg of the ore molybdenite. The percent
by mass ofthis element in the ore was:
A) 52%
B) 6.6%
l?t~ .~-( ;_/~
O'~ 1 ~~C) 34.0 %
• • •S.2e-3%
®22.4%
,
\
\
:~:,'
~l<O ~51 ~O.,,~·\.
-
_."--._~
.
--(PIA> 0, COO j
_ '. , "",\
5. '2
J
J'-'~.::
v
4. A 20.0 mL sample ofglycerol has a mass of25.2 grams. What is the mass ofa 67-mL sample of
glycerol?
A) 7.5 g
20 ({ L
:7."'"
.
') .
B) 53 g
\ . 1.-- U / .. _
A
3.4e4g
~84g
-­
i--r
E) 84.4 g
Page 1
Ch 115 General ChemistI)'
5. The beakers shown below have different precisions as shown.
~
Suppose you pour the water from these three beaker.; into one container. What would be the
volume in the container reported to the correct number of significant figures?
A) 78.817 mL
B) 78.82 mL
C) 78.8mL
90mL
lR
~79mL
n' .,'),. Which oftbe following pairs of'compounds can be used to illustrate the law ofmultiple
.
proportions?
A) NH4 and Nli4Cl
B) Zn02 and ZnCh
H20andHCl
)
~
D
OandN02
) Cl!4andC02
7. Which ofthe following atomic symbols is incorrect'!
A) I:C
B)
31el
17
C)
32p
15
D) ;s!lK
19
@V~
f\
8. Which of the following are incorrectly paired?
{~K. alkali metal
'- B) Ba, alkaline earth metal
£ ; 0, halogen
D) Ne, noble gas
E) Ni, transition metal
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Cb 115 General ChemJstry
9. Write the names ofthe following compounds:
a)
b)
c)
d)
e)
FdSot
NaCiliJ02
KNO:z
Ca(OH):z
NiC03
''(on (:II:)~u\fo.tC-
SodiuM p\cet().:\~
B>to.'~\UfV\ N' h, t<..
CA.\{" vN\ H\f ~vV 'lC i cU.­
Nt (t~JC(l..(\?OY'~t.c
..
T
10. Write the chemical fonnulas for the fono~ compounds or ions.
a)
nitrate ion
NO}
b)
aluminum oxide
E\\li, Q'~
---&.... ammonium ion
Ii» 1"
_
perchloric acid
t\ 0", tiel"'!
e)
copper(ll) bromide
t\lIuW..
"&ti
11. Which metals fonn cations with varying positive charges?
(A))transition metals
Group 1 metals
C) Group 2 metals
D) Group 3 metals
E) metalloids
llf
)
12. All of the following are in aqueous solution. Which is incorrectly named?
A) HCili302, acetic acid
(lTI) lIBr, bromic acid
q H2S03, sulfurous acid
D) HN02, nitrous acid
E) HCI03, chIorie acid
13. Bromine exists naturally as a mixture ofbromine-79 and bromine-81 isotopes. An atom of
bromine-79 contains
@ 35 protons, 44 neutrons, 35 electrons.
B) 34 protons and 35 electrons, only.
C) 44 protons, 44 electrons, and 35 neutrons.
D) 35 protons, 79 neutrons, and 35 electrons.
E) 79 protons, 79 electrons, and 35 neutrons.
14. Gallium consists of two isotopes ofmasses 68.95 amu and 70.95 amu with abundances of
60.16% and 39J~4%, respectively. What is the average atomic mass of gallium?
A) 69.95
B) 70.15
~
71.95
D) 69.75
) 69.55
Page 3
Ch 115 General Chemistry
,
;~
·
15. How many moles ofhydrogen sulfide are contained in a 78.7-g sample of this gas?
~.
B
l~.l
0.43 mol
2.31 mol
H1.:> \
0.
-,;
W\O\
""l.S
31 . 0<6
112.8 mol
\
D) 39.0 mol
E) 4.62 mol
.6. If all ofthe chloride in a 4.155-g sample ofan unknown metal chloride is precipitated as Agel
with 70.90 mL of 0.2010 M AgNOJ, what is the percentage of chloride in the sample?
A) i~:~;~
~
4.1553
1.425 %
) 9.412 %
E) none ofthe above
y.·c.-.f'--
-<-
-.,'
0 . L 0\ 0
.OtO'i
r-~, "l). D
-\
\ <:\~.
t\: NO:;
w_ u \
~\
2
~ ~l!)(".f',f:!, l-~ 1
-J
~
1.
•...
"
\
([" 'leU
\, . f~' ~'
--
v.-­
....."
. .
A ", t~?jl
,,"\
.~
,
17. A hydrocarbon (a compound consisting solely ofcarbon and hydrogen) is found to be 85.6%
carbon by mass. What is the empirical formula for this compound?
Jbg~2
C) C3H
~~ ~
'-<5 ' y",.,
c..
\ t\
\i
I
~
• (.
Ds~\J_.' \ \ ~,) \ c...... -:. -,. \""J.)
2:
~ 1.0 \ )
__\4. 4 ,) \_
t",,:~\__\:'
\ . C)Q~
)
_
1<\. 1 q - '­
r.
18. The empirical formula of styrene is CH; its molar mass is 104.1. What is the molecular :fonnula
ofstyrene?
.Al C2H4
(B»)CsHs '.­
q
Dr
ClOHI2
C6&
,~=
E) none ofthese
19. Determine the coefficient for 02 when the following equation is balanced in standard form
(smallest whole number integers)
C4Hw(g) ~(g) -4lCOz(g) +~H20(g)
A) 4
,.. ' 1, 1­
B) 8
C) 10
rD})13
E) 20
(,
Page 4
-'i;
"
,
!
·
•
Ch 115 GeneralCbemistt'y
t
20. A 23.3-g sample 0
ofthe solution is:
A) 1.16 M
fHF' diIS
•..
'ved m' water to O\ve 2.0 x 1()2 mL of solution. The concentratiOn
SSOl
mo
-
t:r
I
=:
B) O.23M
~"'(
­
,'Z.­
--
A-.0.12M
.
I IlP
LDO
~5.8M
E) 11.7M
5,t0
100 0
21. Which ofthe following aqueous solutions contains the greatest number of ions?
400.0 mL of 0.10 M N~l
~ 0.-\ C \ - - 't;
) OO.OmLofO.lOMCaCh
C~
·9
200.0mLofO.l0MFeCh
Fe'!t CI?
D) 200.0 mL of 0.10 MKBr
~.. Bv.
E) 800.0 mL of 0.10 M sucrose
~
C,-
J
22. Which ofthe following is a strong acid?
./
HF
~
B} KOH
CI04
D) RCIO
E) lIBrO
)
23. Aqueous solutions of sodiwn sulfide and copper(II) chloride are mixed together. Which statement
is correct?
A) Both NaCI and euS precipitate from solution.
N tA. 2S (0. ~'> -I C~· C. \ ~ 3> '·10.. C' ': -1
B) No precipitate forms.
@ CUS will precipitate from solution.
D) NaCI will precipitate from solution.
E) No reaction will occur.
24. Which of the following ions is most likely to fonn an insoluble sulfate?
A) K+
~
Li+
C} Ca2+
) 82­
E) CI­
25. Equal masses (in grams) ofhydrogen gas and oxygen gas are reacted to form water. Which
substance is limiting?
~ Oxygen gas is limiting.
B) Hydrogen gas is limiting.
C) Water is limiting.
D) Nothing is limiting.
E) More information is needed to answer this question.
Page 5
1·
C'.1.
Cb 115 General Cbemistty
26. 1.00 mL ofa 3.50 x lQ-4 M solution of oleic acid is diluted with 9.00 mL of petroleum ether,
forming solution A 2.00 mL ofsolution A is diluted with 8.00 mL ofpetroleum ether, fonning
solution B. How many grams ofoleic acid are 5.00 mL ofsolution B? (molar mass for oleic acid
=282g1mol)
A) 4.94 x lQ-4 g
B) 7.00 x lQ-6 g
5
C) 4.94 x 10- g
,() 6 03 <J 1· f
~91..9877 Xx ll~ gg
...
v-
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•
I..
.
.OC'\L
)
Page 6
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