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 2.
 
 
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Unformatted text preview: 1.
 
 
 
 
 
 
 2.
 
 
 
 
 
 
 3.
 
 
 
 
 
 
 4.
 
 

 
 
 
 
 5.
 
 
 
 
 
 
 6.
 
 
 
 
 
 
 7.
 
 
 
 
 
 Preparatory
Class
for
General
Chemistry,
CHEM
50
 Instructor:
Ram
Subramaniam,
Exam
1,
October
10
2011
 
 Which
of
the
following
quantities
can
be
measured
exactly?
 (a)
 length
 (b)
 mass
 (c)
 volume
 (d)
 time

 (e)
 none
of
the
above
 
 
 
 
 
 
 E
 
 
 
 
 
 Which
of
the
following
balances
has
the
least
uncertainty?
 (a)
 analytical
balance,
±
0.0001
g
 (b)
 triple‐beam
balance,
±
0.01
g
 (c)
 double‐pan
balance,
±
1
g
 (d)
 electronic
balance,
±
0.001
g
 (e)
 platform
balance,
±
0.1
g
 
 
 
 
 A
 
 
 
 
 
 How
many
significant
digits
are
in
the
length
measurement
0.0100
meter?
 (a)
 1
 (b)
 2
 (c)
 3
 (d)
 4
 (e)
 none
of
the
above
 
 
 
 
 
 
 C
 
 
 
 
 
 How
many
significant
digits
are
in
the
time
measurement
20,000
seconds?
 (a)
 1
 (b)
 2
 (c)
 3
 (d)
 4
 (e)
 none
of
the
above
 
 
 
 
 
 
 A
 
 
 
 
 
 Round
off
the
following
measurement
to
three
significant
digits:

2252
cm.
 (a)
 225
cm
 (b)
 226
cm
 (c)
 230
cm
 (d)
 2250
cm
 (e)
 2260
cm
 
 
 
 
 
 
 
 D
 
 
 
 
 
 Add
7.77
g
to
11.666
g
and
round
off
the
answer.
 (a)
 19.0
g
 (b)
 19.4
g
 (c)
 19.43
g
 (d)
 19.44
g
 (e)
 19.436
g
 
 
 
 
 
 Multiply
5.55
cm
times
2
cm
and
round
off
the
answer.
 
 
 
 D
 
 
 
 
 
 
 8.
 
 
 
 
 
 
 9.
 
 
 
 

 
 
 
 10.
 
 

 
 
 
 
 
 11.
 
 
 
 
 
 
 
 
 12.
 
 
 
 
 
 10
cm2
 10.0
cm2
 11
cm2
 11.0
cm2
 11.1
cm2
 
 
 
 
 
 (a)
 (b)
 (c)
 (d)
 (e)
 
 
 
 
 
 Divide
2882
centimeters
by
14.575
seconds
and
round
off
the
answer.
 (a)
 197
cm/s
 (b)
 197.7
cm/s
 (c)
 197.74
cm/s
 (d)
 198
cm/s
 (e)
 198.0
cm/s
 
 
 
 
 
 
 
 B
 
 
 
 
 
 
 If
a
marathon
race
is
26.2
miles,
what
is
the
distance
in
kilometers?
 (Given:

1
mile
=
1.61
kilometer)
 (a)
 0.0615
kilometer
 (b)
 16.3
kilometers
 (c)
 42.2
kilometers
 (d)
 61.5
kilometers
 (e)
 42,200
kilometers
 
 
 
 
 
 
 
 
 
 
 
 
 
 A
 C
 If
a
muscle
tissue
sample
is
125
microns
thick,
what
is
the
thickness
in
inches?
 (Given:

1
micron
=
3.94
×
10–5
inch)
 
 (a)
 3.15
×
10–7
inch
 
 (b)
 3.15
×
10–6
inch
 
 (c)
 4.93
×
10–2
inch
 
 (d)
 4.93
×
10–3
inch
 
 (e)
 3.17
×
107
inches
 
 
 
 
 
 
 D
 How
many
minutes
does
it
take
an
athlete
to
run
a
20K
race
that
is
12.4
miles?
 (Assume
the
athlete’s
pace
is
7.50
minutes
per
mile.
)
 
 (a)
 0.605
minute
 
 (b)
 1.65
minutes
 
 (c)
 93.0
minutes
 
 (d)
 150
minutes
 
 (e)
 1860
minutes
 
 
 
 
 
 
 
 C
 A
sample
of
white
gold
is:

18.0
grams
gold,
3.0
grams
silver,
2.0
grams
cobalt,
 and
1.0
gram
platinum
by
mass.
What
is
the
percent
of
platinum
in
the
sample?
 
 (a)
 4.2%
 
 (b)
 8.3%
 
 (c)
 13%
 
 (d)
 25%
 (e)




75%
 
 
 
 
 
 
 
 
 A
 
 13.
 If
a
penny
has
a
mass
of
2.507
g
and
is
2.5%
copper,
what
is
the
mass
of
copper
 in
the
coin?
 
 
 (a)
 0.063
g
 
 
 (b)
 0.24
g
 
 
 (c)
 0.63
g
 
 
 (d)
 2.4
g
 
 
 (e)
 6.3
g
 
 
 
 
 
 
 
 
 A
 
 14.
 If
the
radius
of
a
potassium
atom
is
2.27
×
10–7
mm,
what
is
the
radius
in
µm?
 
 
 (a)
 2.27
×
10–16
µm
 
 
 (b)
 2.27
×
10–10
µm
 
 
 (c)
 2.27
×
10–4
µm
 
 
 (d)
 2.27
×
10–1
µm
 
 
 (e)
 2.27
×
105
µm
 
 
 
 
 
 
 
 C
 
 15.
 If
a
chemistry
student
weighs
155
lb,
what
is
the
mass
in
kilograms?
 
 
 (a)
 0.341
kg
 
 
 (b)
 0.394
kg
 
 
 (c)
 70.4
kg
 
 
 (d)
 341
kg
 
 
 (e)
 70,400
kg
 
 
 
 
 
 
 
 C
 
 16.
 If
a
rectangular
stainless
steel
block
measures
5.05
cm
by
1.50
cm
by
1.25
cm,
 what
is
the
volume
of
the
stainless
steel
solid?
 
 
 (a)
 0.106
cm3
 
 
 (b)
 2.69
cm3
 
 
 (c)
 4.21
cm3
 
 
 (d)
 6.06
cm3
 
 
 
 
 
 
 
 E
 
 
 (e)
 9.47
cm3
 
 17.
 If
an
automobile
engine
has
a
displacement
of
155
in.3,
what
is
the
volume
in
 cubic
centimeters?
 
 
 (a)
 9.45
cm3
 
 
 (b)
 61.0
cm3
 
 
 (c)
 394
cm3
 
 
 (d)
 1000
cm3
 
 
 
 
 
 
 
 E
 
 
 (e)
 2540
cm3
 
 18.
 A
109.35
g
sample
of
brass
is
added
to
a
100‐mL
graduated
cylinder
with
55.5
 mL
of
water.
If
the
resulting
water
level
is
68.0
mL,
what
is
the
volume
of
the
 brass?
 
 
 (a)
 12.5
mL
 
 
 (b)
 32.0
mL
 
 
 (c)
 44.5
mL
 
 
 (d)
 87.5
mL
 
 
 (e)
 123.5
mL
 
 
 
 
 
 
 
 A
 
 19.
 A
rectangular
block
of
aluminum
has
a
mass
of
39.589
g
and
measures
5.10
cm
 by
2.50
cm
by
1.15
cm.
Find
the
density
of
the
aluminum
block.
 
 
 (a)
 0.370
g/cm3
 
 
 (b)
 2.70
g/cm3
 
 
 (c)
 3.11
g/cm3
 
 
 (d)
 14.7
g/cm3
 
 
 
 
 
 
 
 B
 
 
 (e)
 22.3
g/cm3
 
 20.
 Osmium
is
one
of
the
most
dense
elements
(22.5
g/cm3).
What
is
the
mass
of
 10.0
cm3
of
the
metal?
 
 
 (a)
 0.444
g
 
 
 (b)
 2.25
g
 
 
 (c)
 22.5
g
 
 
 (d)
 225
g
 
 
 (e)
 444
g
 
 
 
 
 
 
 
 
 D
 
 21.
 Platinum
is
one
of
the
most
dense
elements
(d
=
21.5
g/cm3).
What
is
the
 volume
of
a
10.0
g
sample
of
the
metal?
 
 
 (a)
 0.465
cm3
 
 
 (b)
 2.15
cm3
 
 
 (c)
 21.5
cm3
 
 
 (d)
 215
cm3
 
 
 
 
 
 
 
 A
 
 
 (e)
 465
cm3

 
 22.
 An
antifreeze
solution
freezes
at
–100
°C.
What
is
the
freezing
point
on
the
 Fahrenheit
scale?
 
 
 (a)
 –212
°F
 
 
 (b)
 –148
°F
 
 
 (c)
 –88
°F
 
 
 (d)
 –82
°F
 
 
 (e)
 –73
°F
 
 
 
 
 
 
 
 
 B
 
 23.
 The
specific
heat
of
ice
is
0.492
cal/(g
×
°C).
How
many
calories
of
heat
are
 required
to
raise
100.0
g
of
ice
from
–20.0
°C
to
–0.5
°C?
 
 
 (a)
 2.52
cal
 
 
 (b)
 10.4
cal
 
 
 (c)
 49.2
cal
 
 
 (d)
 959
cal
 
 
 (e)
 3960
cal

 
 
 
 
 
 
 
 D
 
 24.
 A
250.0
g
sample
of
copper
released
1830
calories
of
heat
when
cooled
from
 100.0
°C
to
20.5
°C.
What
is
the
specific
heat
of
the
metal?
 
 
 
 
 
 
 25.
 
 
 
 
 
 
 26.
 
 
 
 
 
 (a)
 (b)
 (c)
 (d)
 (e)
 0.0732
cal/(g
×
°C)
 0.0921
cal/(g
×
°C)
 0.357
cal/(g
×
°C)
 10.9
cal/(g
×
°C)
 23.0
cal/(g
×
°C)
 
 
 
 
 
 
 B
 What
is
the
term
for
a
direct
change
of
state
from
a
gas
to
a
solid?
 
 (a)
 condensation
 
 (b)
 deposition
 
 (c)
 sublimation
 
 (d)
 vaporization

 
 (e)
 none
of
the
above
 
 
 
 
 
 
 B
 Air
contains
nitrogen,
oxygen,
argon,
and
other
gases.
Which
of
the
following
 describes
air?
 
 (a)
 compound
 
 (b)
 element
 
 (c)
 heterogeneous
mixture
 
 (d)
 homogeneous
mixture
 
 (e)
 none
of
the
above
 
 
 
 
 
 
 D
 
 
 
 
 
 
 27.
 Sterling
silver
is
an
alloy
of
silver
and
7.5%
copper.
Which
of
the
following
 describes
sterling
silver?
 
 
 (a)
 compound
 
 
 (b)
 element
 
 
 (c)
 heterogeneous
mixture
 
 
 (d)
 homogeneous
mixture
 
 
 (e)
 none
of
the
above
 
 
 
 
 
 
 D
 
 28.
 Which
of
the
following
is
a
general
characteristic
of
a
metallic
element?
 
 
 (a)
 shiny
luster
 
 
 (b)
 ductile
 
 
 (c)
 conductor
of
electricity
 
 
 (d)
 high
melting
point
 
 
 (e)
 all
of
the
above
 
 
 
 
 
 
 
 E
 
 29.
 Which
of
the
following
is
a
general
characteristic
of
a
nonmetallic
element?
 
 
 (a)
 shiny
luster
 
 
 (b)
 pliable
 
 
 (c)
 high
melting
point
 
 
 (d)
 reacts
with
nonmetals
 
 
 (e)
 none
of
the
above
 
 
 
 
 
 
 D
 
 30.
 Ammonium
sulfate,
(NH4)2SO4,
is
in
fertilizer
and
replenishes
nitrogen
to
the
 soil.
What
is
the
total
number
of
atoms
in
the
chemical
formula?
 
 
 (a)
 13
 
 
 (b)
 14
 
 
 (c)
 15
 
 
 (d)
 20
 
 
 (e)
 none
of
the
above
 
 
 
 
 
 
 C
 
 31.
 Which
of
the
following
properties
of
kerosene
is
a
chemical
property?
 
 
 (a)
 soluble
in
gasoline
 
 
 (b)
 flammable
with
oxygen
 
 
 (c)
 colorless
liquid
 
 
 (d)
 boiling
point,
174
°C
 
 
 (e)
 density,
0.730
g/mL
 
 
 
 
 
 
 B
 
 32.
If
5.58
g
of
powdered
iron
reacts
with
powdered
sulfur
to
produce
8.79
g
of
 iron(II)
sulfide,
what
is
the
mass
of
reacting
sulfur?
 
 
 (a)
 3.21
g
 
 
 (b)
 5.58
g
 
 
 (c)
 8.79
g
 
 
 (d)
 14.37
g
 
 
 (e)
 impossible
to
predict
from
the
given
information
 
 
 A
 
 33.
 Which
physical
state
demonstrates
very
high
kinetic
energy?
 
 
 (a)
 solid
state
 
 
 (b)
 liquid
state
 
 
 (c)
 gaseous
state
 
 
 (d)
 all
of
the
above
 
 
 (e)
 none
of
the
above
 
 
 
 
 
 
 C
 
 34.
 Which
of
the
following
is
a
form
of
energy?
 
 
 (a)
 heat
 
 
 (b)
 light
 
 
 (c)
 nuclear
 
 
 (d)
 all
of
the
above
 
 
 (e)
 none
of
the
above
 
 
 
 
 
 
 D
 
 35.
 If
a
mineral
water
bottle
contains
375
mL,
what
is
the
volume
in
quarts?
 
 
 (a)
 0.396
qt
 
 
 (b)
 0.826
qt
 
 
 (c)
 1.21
qt
 
 
 (d)
 2.52
qt
 
 
 (e)
 355,000
qt
 
 
 
 
 
 
 
 A
 
 ...
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This note was uploaded on 12/12/2011 for the course CHEM 50 taught by Professor Subramaniam during the Fall '11 term at UCSD.

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