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Engineerin ( Sectibn 200 28)
Name: S/c ~ r M < L
Student Number
QUEEN S UNIVERSITY
FACULTY OF APPLIED SCIENCE
APSC 131
Chemistry
and
Materials
Mi
erm
Examination for Weeks 1 - 4 of Course
October 15th 2014 7:00
p.m.
Duration:
2.0 h
CASIO
991
AND AP OVED GOLD
STICKER
CALCULATORS ARE PERMITTED.
Please note: Proctors e unable to respond to queries about the interpretation of exam questions.
D
your best
to
answer ex questions as written.
Some useful equation , data and a periodic table may be found at the end of this examination
paper.
The mark breakdown l r each part is shown below.
Part A:
Multiple Choic
Part B: Written
Question 1
Question
Question
3
Question
4
Question 5
Question 6
Total
M.C.==
(20
marks)
6
marks)
4
marks)
(6
marks)
4
marks)
(7
marks)
8 marks)
/20: Written==
Instructor: Wm. Ne stead
/35: Total=
155
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:
I
The answers to
the
m tiple choice questions will be placed on a computer-marked sheet.
To
answer these questiJns:
I
You
must
use a soft-lead pencil (HB or softer).
The
scanner will
not
read ink no matter
how black a mark i
i
makes. -
Do
not
bend or
fold
the answer sheet in any way or it will become j mmed in the
scanner.
I
Write nd code your
n me
nd student number on the computer marked answer sheet in
the upper left-hand borner.
Do not mark the m p u t r answer sheet in any way except to code in the answers. You
will have difficulty yrasing any mistakes once they
ve
been coded.
Make sure you ve cbded in all
of
he answers.
i
Part A I
Multiple Response Questions 1 mark each/ 10 marks total
I
1_ Which compound is
r correct/y
named?
a) NaBr03: sodium bromate
b KI02: pot ssium iodite
@
Ca(CI0)2: calcium chlorite
d) NaCI03: s dium chlorate
e) they are a I correct
2_
Which
o
the
o l l o w n
is a chemical property:
a) Water frJezes to form ice
b Zinc meti l can be hammered into a thin film
@
Gold not react with water
d Water b ils to form steam
3. In
Europe, the vol um
o
a soda is given
in
cL How many
m
are contained
in
a can
o
soda
labeled
75 cL ?
@15
b
75
c
7.5
d) 7500
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.
4. All
of
the following are intensive properties
of
a substance ex ept
mass
b melting point
c colour
d) density
5. A reaction run at o n ~ t n t pressure releases 512 kJ of heat. At constant volume, the same
reaction releases 518'kJ
of
heat. Assuming no mechanical
or
electrical
work
is done, what is
LlH for this reaction?
a) -518 kJ
b
6 kJ
@ 512
kJ
d) +6 kJ
6. How much heat, in joules,
must
be added to 0.
250
mol
of
Ar(g) to raise its temperature from
20.0 to 36.0C at constant pressure?
a)
50.0
@
83.1
c)
187
d)
200
e)
333
;
7.
What
is the change in i;nternal energy
of
a system in which 10 kJ
of work
is
done
by the system
on the surroundings an? 5 kJ of heat is gained by the system from the surroundings?
a) f 5 kJ
I
I
b
-15 kJ
kJ
5
kJ
)
I
e)
f
1 kJ
;
8.
The "nb" term in van der Waals equation (see information sheet) allows for the fact
that: :
a
real gases liqueft
I
b) molecules in reai gases have mass
I
@nolecules
in real gases have volume
. I
d) molecules m rel gases attract each other
I
I
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9. What
mass, in grams, of a solution containing 12 by mass sodium chloride is needed for a
process that requires 8 g of sodium chloride?
a)
b
d)
12
150
67
8
10. Calculate the value of
Af1
for the reaction
CuCh s) + Cu(s)
-
2 CuCl(s)
given the information
a)
@
c)
d)
e)
Cu(s + Ch(g) CuCh s)
2 Cu(s)
+
Ch(g) - 2 CuCl(s)
-242 kJ/mol
+170 kJ/mol
-170 kJ/mol
-188 kJ/mol
+242 kJ/mol
i .1Hf = -206 kJ/mol
L1Hf = -36 kJ/mol
Multiple Response Questions 2 mark each/ 10 marks total)
11
. Oxygen masks produce
02 in
emergency situations by a reaction of potassium superoxide,
K02. It reacts with C02 and H20 from the wearer s breath to produce oxygen:
4
K02(s)
+ 2
H20 g)
+ 4
C02(g) ---->
4
KHCQ3(s)
+ 3
02(g)
If
the person wearing the l
mask
exhales 0.758 g of C02 per minute, how many grams of
K0
2are
consumed in five minutes? (Assume that H20 is NOT limiting .)
a) 0.364
b
0.485
c)
1.82
@
6.
11
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12. Cyclohexanol, CsH120, has a heat
of
combustion of 890 .7 kJ/mol. 0.708 g of cyclohexanol
undergoes complete combustion in a bomb calorimeter that has a heat capacity
of
2.70 kJ/K.
What is the final temperature, in C, if the initial temperature of the calorimter is 27C?
a
24.7
29.3
c)
26.6
d)
31.4
13. For the reaction, H2 g) + Y 02 g) H20 g), = 241.8 kJ/mol, What quantity of heat, in
kJ, is evolved when a 72.0 g mixture containing equal parts of hydrogen and oxygen, by
mass is burned?
a)
b
c)
4860
1088
272
544
14. If a 2.00 L flask
of N2
at 20 C and 1.00 atm pressure is connected to a 3.00 L flask of
02
at
20 C and 1.50 atm pressure, and the gases are allowed to mix, the final pressure in the
system in atm) is:
a) 0.400
b) 0.900
c)
1.20
1.30
15.
A
gas expands against a constant external pressure of 202 kPa, increasing its volume by
3.40 L. Simultaneously, the system absorbs 400 J of heat from its surroundings.
What
is
in
joules, for this gas?
a)
c
d
-689
-287
400
1087
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Part
B
Answer each question in the space provided.
35 marks)
Question
1
Write a correct chemical formula for each of the following.
a mercury I) sulfite
b
cuprous oxalate
Cu,
C;..,Of
c. hypoiodous acid
H lO
Write a correct name for each of the following.
a
Pb Br04)4 ous, ic)
b
Hg2Se03 IUPAC)
rn cMAJ
rJ o
C Mg l03)2 IUPAC)
Question 2
Balance each of the following equations.
V V
KCI03 aq) + HCI aq) ~
V
KCl aq) + _5 H20 al)
+ 2.._H3P04 aq)
~
2_Na3P04 aq)
o J ~
+ Cl2 g)
3 marks)
3 marks)
4 marks)
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Question
6 marks)
3. A mixture consisting
o
only sodium chloride (NaCl) and potassium chloride (KCI) has a mass
o
1.0000 g
When the mixture is dissolved
in
water and an excess
o
silver nitrate is added, all
o
the chloride ions
associated with the original mixture are precipitated as insoluble silver chloride (AgCI). The mass of silve
chloride
is
found to
be
2.1476 g.
a. Write the equations showing the reactions between sodium chloride and silver nitrate and then betwee
~ t a ~ i ~ ~ r L ~ ~
s i l v e i t r a ~
N03 i ~ f i) t N ~ { ,
b. Calculate the mass percentage of sodium chloride and potassium chloride in the original mixture.
(4
marks)
n Ntt
CA
\'\Net LI ;; _L
a-o-trO J ~
/ . ~ 3 . x . . _
/ y ~ ~
5 'S'1 '
; t'\
\) l f .z .. r C1
?L
I-
)
~ 1
IL.
=
YnNo..ef
tf2 59o
a
)
_{ 7. S
fo k
{
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uestion
4
marks}
When glucose, a sugar, reacts fully with oxygen, carbon dioxide and water are produced.
t.H
0
= -2820 kJ
Suppose a person with a mass
of
50
kg
(mostly water, with specific heat capacity 4.18 J/(K.g)) eats a candy
bar containing 14.3 g
of
glucose. If all the glucose reacted with oxygen and the heat produced were used
entirely to increase the person s body temperature, what temperature increase would result? (As an aside,
most of the heat produced is lost to the surroundings before such a temperature increase occurs.)
W r ~
ff ,3j
~ f / i i O r . /
I
1 t 3 ~ 8 s
~ : = : .
j_
1-2-3,, (;
w
I ~
-k
5DoW_ 6@
.
l ~
. ,
< 6 Y
vt\
r
/c
K
f
-
/. f
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