Chemistry
II
(AP)
 
 C1
Practice
 


1. Perform
the
following
using
proper
precision
or
significant
figure
rules:
 a. 362
x
485
=
 b. 5.60
x
103
x
2.2
x
104
=
 c. 3.58
x
103
/1.8
x
106
=
 d. 14.34
+
16.2
+
0.06
=
 e. 1.561
–
1.80
=
 
 2. A
certain
brand
of
coffee
is
offered
for
sale
at
$2.25
for
a
3‐lb
can
or
$1.76
for
a
1‐kg
can.

 Which
is
the
better
buy?
 
 3. A
sprinter
runs
the
100‐yd
dash
in
9.8
s.

What
would
be
his
time
for
a
100‐m
run
if
he
were
 to
run
at
the
same
rate?
 
 4. Convert
296
K
to
˚F.
 
 5. Convert
212˚F
to
K.
 
 6. A
block
of
wood
having
the
dimensions
105
cm
x
5.10
cm
x
6.20
cm
weighs
2.26
kg.

What
is
 the
density
of
the
wood
in
g/cm3?
 
 7. A
glass
container
weighs
25.60
g
empty
and
35.55
g
when
filled
with
water
at
20.0˚C.

The
 density
of
water
at
20˚C
is
0.998
g/cm3.

When
10.20
g
of
lead
shot
are
placed
in
the
empty
 container,
which
is
then
filled
with
water
at
20˚C,
the
total
weight
is
44.83
g.

What
is
the
 density
of
the
lead?
 
 8. The
diameter
of
a
metal
wire
is
often
referred
to
by
its
American
wire
gauge
number.

A
20‐ gauge
wire
has
a
diameter
of
0.03196
in.

How
many
meters
of
wire
are
present
in
a
1‐lb
 spool
of
20‐gauge
copper
wire?

(The
density
of
Cu
is
8.93
g/cm3.)
 
 Answers
 1. a.

176000
or
1.76
x
105
 b.

1.2
x
108
 c.

2.0
x
10‐3
 d.

30.6
 e.

–0.24
 
 2. 3‐lb
can
is
the
better
buy
 
 3. 10.7
s
 
 4. 73.4˚F
 
 5. 373
K
 
 6. 0.681
g/cm3
 
 7. 11.1
g/cm3
 
 8. 98.3
m