mendoza (cm56967) – Unit 1 HW #1 – schneider – (4184)
1
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printout
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have
40
questions.
Multiplechoice questions may continue on
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before answering.
001
10.0points
What is the proper solution to the following
equation?
(150 + 2
.
5 + 36
.
75)
÷
(6
.
60 + 0
.
173) =
1.
28
correct
2.
30
3.
27.94183
4.
27.94
5.
27.9
6.
27.942
7.
27.9418
Explanation:
The rule of addition gives 2 sig figs on the
top and 3 sig figs on bottom (you can only be
as precise as the least precise number). Then,
by the rule of division (your answer cannot
have more sig figs than the least number of sig
figs used in your calculation), the final answer
27.94 needs to be rounded to 2 sig figs: 28.
002
10.0points
What is the length of the line segment in
dicated on the scale provided using proper
significant figures?
0
1
2
3
1.
3.000 units
2.
3.00 units
correct
3.
3.0 units
4.
3 units
Explanation:
The scale is in units of tenths, so hundreths
is the uncertain digit.
003
10.0points
What is the proper measurement of the vol
ume represented?
1
2
3
4
5
mL
1.
2.500 mL
2.
2.50 mL
3.
2.5 mL
correct
4.
2.0 mL
Explanation:
The scale is in units of 1, so tenths is the
uncertain digit.
004
10.0points
A pipe drips at 155 mL/min.
Express this is units of gallons/day.
1.
377 gal/day
2.
942 gal/day
3.
2.34 gal/day
4.
0.223 gal/day
5.
223 gal/day
6.
58.9 gal/day
correct
7.
15.7 gal/day
Explanation:
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mendoza (cm56967) – Unit 1 HW #1 – schneider – (4184)
2
? gal
day
=
155 mL
min
×
1 L
1000 mL
×
1 gal
3
.
785 L
×
60 min
1 hr
×
24 hr
1 day
=
58
.
9 gal
day
005
10.0points
For the conversion of 0.0003140 kilograms to
ounces, the conversion factors are 10
3
grams
per kilogram, 1 pound per 453.6 grams and
16 ounces per pound.
The correctly expressed answer is
1.
1
.
108
×
10
2
oz
2.
1
.
108
×
10
−
5
oz
3.
1
.
108
×
10
−
2
oz
correct
4.
4
.
329
×
10
−
5
oz
5.
8
.
902
×
10
−
1
oz
Explanation:
? ounces = 0
.
0003140 kg
×
1000 g
kg
×
1 pound
453
.
58 g
×
16 ounces
1 pound
= 1
.
108
×
10
−
2
ounces
Zeroes at the end of numbers containing a dec
imal point are considered to be significant, so
0.0003140 has 4 significant figures. The 1 kg
to 1000 g and 1 pound to 16 ounces conver
sions are exact definitions, so these numbers
do not affect how many significant figures the
answer should have.
006
10.0points
Keeping in mind the rules for significant dig
its, calculate the sum of 5.622 g and 0.3178
g.
1.
5.940 g
correct
2.
5.94 g
3.
5.93980 g
4.
5.9398 g
5.
5.9 g
6.
6 g
Explanation:
sum of given values = ?
5
.
622 g + 0
.
3178 g = 5
.
940 g
007
10.0points
Which is the LEAST precise of these devices
for measuring liquid volumes?
1.
buret
2.
beaker
correct
3.
graduated cylinder
4.
pipet
Explanation:
A beaker is the least precise device to mea
sure liquid volumes.
008
10.0points
What is the formula of ammonium nitrate?
1.
NH
4
NO
3
correct
2.
NH
4
N
3.
NH
4
(NO
3
)
2
4.
(NH
4
)
2
NO
3
Explanation:
The ammonium ion is NH
+
4
; the nitrate
ion is NO
−
3
.
One NO
−
3
is needed to balance
the charge on each NH
+
4
, so the formula for
ammonium nitrate is NH
4
NO
3
.
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 Fall '16
 Mrs. Bickel
 Chemistry, AP Chem

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