wetsel (zpw67) – Postlab 1 Measurement – lyon – (51900)
1
This
printout
should
have
28
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001(part1of4)10.0points
Calculate
720
.
0 + 5
.
4
×
10
2

117

0
.
064
and report the result using the correct number
of significant digits.
Your answer must be within
±
0.0%
002(part2of4)10.0points
Calculate
0
.
834
×
52
.
48
0
.
09
×
2
.
51
and report the result using the correct number
of significant digits.
Your answer must be within
±
0.0%
003(part3of4)10.0points
Calculate
374
.
82

15
.
74
×
3
and report the result using the correct number
of significant digits.
Your answer must be within
±
0.0%
004(part4of4)10.0points
Calculate
2516
.
32
×
1
.
13
×
10
−
4
6
.
00
+ 8
.
7
×
10
−
2

684
.
2
×
0
.
0030
and report the result using the correct number
of significant digits.
Your answer must be within
±
0.0%
005
10.0points
What is a chemical change?
1.
oxygen produced from the breakdown of
nutrients
2.
melted ice cream
3.
erosion of rock by the wind
4.
sugar cube dissolved in water
006
10.0points
Standard deviation is a measure of the scatter
in the data.
Does a small value for stan
dard deviation indicate high precision or low
precision?
1.
high precision
2.
low precision
3.
Cannot determine from the information
given.
4.
Both 1 and 2.
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 Spring '08
 leytner
 Chemistry, Chemical reaction, Accuracy and precision, correct number

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