HOUR EXAM I
CHEM 1021
9127100
THIS IS VERSION
A
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Random ID# =
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y
A
Please indicate the correct answer for each question. Each question is worth 5 points. There is only
one correct answer per question. Questions with more than one answer will receive no credit. No
partial credit will be given. Scratchwork doesn't count, right or wrong! No answers given in the
blue books will be counted.
Some
PossibZv
A vogadro's
#
Us~(ul
I~(ormation:
(NA)
6.022 x 1023 mole-l
Molar Volume @ DoC, latm:
22.4 liters
Temperature Conversions:
T(F) = (9/5)T(C) + 32
T(C) = (5/9)[T(F) -32]
Boyle's Law
PV=k
NOTE: A PERIODIC TABLE
THE BACK OF THIS EXAM.
AND SOLUBILITY
TABLE
ARE ATTACHED
TO
Manganese makes up 1.3 x 10-4 percent by mass in a normal human body. How many
grams of manganese would be found in the body ofa person weighing 183 Ib? (2.2Ib
= 1.0 kg).
-4
~ i D IJ.A'"'
1
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)(
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(b)
c
(d)
(e)
)(
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(;X)c!>.
I:{
,£.
-(j
2.~
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-
0. ( 1~
,oD
1100g
.llg
11 9
0.24 9
2.4 9
~
..,.
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,. .;)XID
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2 A freighter carrying cargo of uranium hexafluoride sank in the English Channel in
late August 1984. The cargo of uranium hexafluoride wei~hed 2.25 x 108 kg and was
contained in 30 drums, each having a volume of 1.62x10 liters. What is the density
of uranium hexafluoride in g/ml?
~ ."'2.S-)t,, o ~M:t ~~1.39 g/ml
~
(b)
d == [::;;;);rl.{,,2.:tlO~b.£)
63 g/ml
c 13.9 g/ml
(d) 46.3 g/ml
(e) 41.7 g/ml
)(.
.,;::"'-J'
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X
---
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Jktf
:.
Which of the following statementsabout atomic structure is false?
(a) The electrons occupy a very large volume compared with the nucleus.
, (b) Almost all of the mass of the atom is concentrated in the nucleus.
/$J;J. The protons and neutrons in the nucleus are contained in a very small volume.
'1(,{.gJThe number of protons is always equal to the number of neutrons.
V' ( e) All the positive charge in the atom is contained in the nucleus.
4
Which of the following has 45 neutrons, 35 protons, and 36 electrons?
1? '('"0 ('\11i t'\ e..
(a) 80Hg
~ lOJRh"
~8°Bf
(d) 71Kr
(e) 81Bf
e
?~
?fb~t\J
4-
=9
-
~
f1~kY'l/
'"I?
t-
=-
~ .s.- +- «.4"r
c:o:v '\1.;
::
i""cJ
5
All of the following are true statementsabout chemical processesexcept
~ons
~
r' ( c)
0/'( d)
( e)
6
are formed by changing the number of protons in an atom's nucleus.
Ions are formed when electrons are added to a neutral atom.
Ions are formed when electrons are removed from a neutral atom.
Some ions have + charge and some have -charge.
Metals tend to form positive ions.
For which of the following
is the chemical formula incorrectly
(a) ammonium bromide:
~ potassium carbonate:
(!g barium phosphate:
( d) copper(I) chloride:
(e) manganese(IV) oxide'
written?
2.ot'
\ 'i$~
'2~ "l~CA.t
NB4Br
K2CO3
BaPO4
CuCI
MnO2
Which of the following statementsabout the Periodic Table is(are) true?
7
..,. A.
B.)(.
C.~
"
D.
--E.
Elements are ordered according to their atomic numbers.
Non-metals are found on the left.
Elements in the same horizontal row have similar properties.
Elements in the far-right column (18) are relatively inert.
Elements in Group 2 are metallic.
A only
(a)
B and C only
A, D, and E only
~
(d)
(e)
C, D, and E only
All of the statements
are true.
8. A sample of ammonia (NH3) has a mass of 56.6 g. How many molecules are in this
sample? The molar mass OfNH3 is 17.03 g.
mol ecules
(a)
3.32
(b)
1.70x
1025
mol ecules
x 1024
mol ecules
1.78 x 1024
mol ecules
(C) 6.78
( d)
@.0
Ox
1024
mol ecules
'5(,..(..
\;
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.:.
\
)(
'.022
)( /0"'2. '3
}
'&.'I v1,.t 0 l ~ (..<.,.\ e .5.,
2 .OO)( 10
~\to(."C-\q/¥c-
9.
What is
The empirical formula of styrene is CH; its molar mass is 104
the molecular formula of styrene?
(
I~'+--
H
I.b"~
..::
5.01
~C2~
%(t1.~)
~C8H8
( C) C1oH12
loL.(.\
loC\1\0\).
( d) C6ll6
(e) none of these
10.
:
('((..jV'
l"Jo.'
" ('7.0\"\
A 6.32 9 sample ofKC1OJ
was decomposed
..7~,r.
according
to the following
equation
2KCIO3(s) ~ 2KCl(s) + 302(g)
How many moles of 02(g) are formed? The molar mass ofKC1O3 is 122.55 g.
(a) 1.65 moles
(b) 0.051 moles
(c) 0.0344 moles
0°.0774
moles
(e) 0.83 moles
1
\M~ , t.~ ~t ,~
~.32 d )(
~
Which ofthe following
i>
b)
c)
.1~I r7
~-7
~\(,.
~J)
'I(
:?MOle.
.-
.; 0.
O{
"7'1
M-o\~
aqueous solutions contains the greatest number ofions?
400.0 ml ofO.10
MNaCl
~
ooo.e).~
(
(.\0
300.0 ml ofO.10 M CaCh 4
200.0mlofO.10MFeCI3-~
( , 1ooc.t
\
(.'2.0c;X;)..Q)(
(d)
200.0mlofO.10MKBr
~
(\1.£)~o.t,,)
(e)
800.0 ml 0.10 M sucrose
-~
f\o~
) )(. (
2.
(.10 ~ ) ~
.IOfI.J)
It
(~tC.?~\
'~~l)..~.Ck
~-(~
C'"J )
( 4)
)t.c:~)
~
;.
(e)
400. ml
333.ml
278 ml
800. ml
c>.Of./
0
e\~ 400~ \~
~ )~~'e.
.S-I.'~~
-O
.'2.??' .Mota
"'~
(vt I =- .~t,(.vI\.oto.~-
{).'2.S'O -:
~
't')..QL
200. ml
~
I VI
=
M'l.
(. \D~
v,
v"\~.)(
\.(.)C~
)
~
=
I*'r.t
#" 0,07
~
O,O'r
A 51.24 9 sample ofBa(OH)2 (molar mass 171 g) is dissolved in enough water to
make 1.20 liters of solution. How many ml of this solution must be diluted with
water in order to make 1.00 liters of 0.100 M Ba(OHh?
-."
@
(b)
(c)
( d)
02,
2~~
~oteJ
~
12.
(.?L.
1,"2. c- ,"I"~
L"
~,Obl
~
tJ
"
I'
THE NEXT THREE QUESTIONS REFER TO THE CHEMICAL
REACTIONS SHOWN BELOW.
A.
2Li (s) + Br2(g) ~ 2LiBr(s)
O
O
~, -,
B.
2H+(aq) + 2Zn(s) ~ 2Zn2+(aq) + H2(g)
+,
o
+-'1..
O
~~
OIC'*
KOH(aq)
c.
+ HN { O3(aq)
+"...
+1..
Fe2+(aq)
D
+ 20K(aq)
.t.
13
KNO3(aq)
tlt$'~
~
C{§D
(d)
(e)
+ H20(1)
~\
.~
Fe(OH)2(S)
+1.'a.+1
Which of the above represents a neutralization
(a)
(b)
14.
.~..I
~
-1
reaction?
A
B
C
D
None of the above representsa neutralization reaction
Which of the above is(are) best describedas oxidation-reduction reaction(s)?
A and B only
(b)
(c)
(d)
(e)
A and D only
A only
C and D only
A, B, and C only
For equation C above, which of the following best representsthe net ionic
15
reaction?
w
(b)
(c)
(d)
(e)
H+(aq)
W(aq)
K+(aq)
K+(aq)
K+(aq)
+
+
+
+
+
OK(aq) ~
NO3-(aq) ~
OK(aq) ~
OK(aq) ~
NO3-(aq) ~
H2O(1)
HNO3(aq)
KOH(l)
KOH(aq)
KNO3(aq)
16.
A sample of magnesium
a true
(a)
~
(d)
(e)
17
regarding
is dissolved
the resulting
in water. Which
of the following
is
solution?
The negative ends of the water molecules are directed toward MgCl2
molecules.
The negative ends of the water molecules are directed toward Mg2+ ions.
The negative ends of the water molecules are directed toward Cl- ions.
Microscopic crystals ofMgCb(s) are suspendedin the water, with both the
positive and negative ends of nearby water molecules directed toward the
surface.
Mg2+ and Cl- ions in solution are arranged in a regular, rigid array.
Aqueous solutions of sodium sulfide and copper(ll) chloride are mixed together .
Which of following is most likely to occur?
(a)
(b)
(:\§J)
(d)
(e)
18
statement
chloride
Both NaCI and CuS will precipitate from the solution.
No precipitate will form.
CuS will precipitate from the solution.
NaCI will precipitate from the solution.
No reaction will occur.
One liter of an ideal gas at 25 oC is contained in a piston and held at a pressure of
5.00 atm. If the volume is then reduced to 300. ml, what is the new pressure of the
gas?Asssume the temperature remains constant throughout the experiment.
(a)
(b)
(c)
(d)
@:)
1.5 atm
0.67 atm
15.0 atm
5.0 atm
16.7atm
S" .00 4.~'M
1,00
--.,
..l
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~ v;; k.
C-""
r\vl:?'\..V'l.
.r.r),-, q+.u)(I,C:>'-'..e)";\r'l:
1J1..(.SOC-'-C)
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19.
An ideal gas is one for which
(a)
~
(d)
(e)
the value of PV is the sameat all temperatures.
the value of PN is the sameat all temperatures.
the value of PV is constant, so long as the temperature and mass are also
constant.
PV deviates from a constant value only at high temperatures.
PV deviates from a constant value only at low pressures.
A sample of He(g) has a mass of 2.00 g. If the pressure is 1.00 atm and the
temperature is 0 °C, what is the volume? \
20
~
'-(r;')
(c)
(d)
(e)
11.2liters
2.00 liters
22.4 liters
0.00 liters
0.089 liters
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