8.
Are the measurements in problem 6 accurate? Are they precise? Explain your answers.
9.
Which of these measurements was made with the most precise measuring device: 8.1956 m, 89.20 m, or
8.196 m? Explain your answer.
Density Data of Sucrose
Student B
Studend C
Trial Density (g/cm
3
)
Density (g/cm
3
)
1
1.40
1.70
2
1.68
1.69
3
1.45
1.71
Avg
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
2
AccuracyPrecision & Significant Figures in Measurements WS
10.
On the rulers below, measure the length of the paper clip, in cm. The measurements will NOT be identical.
You must read to the calibration markings then estimate the next decimal place as the final digit. Cover up
the ruler(s) below the one you are using to prevent being influenced by them.
length:
cm
sig. fig(s).
length:
cm
sig. fig(s).
length:
cm
sig. fig(s).
a.
Why were the measurements different?
b.
Which measurement required the greatest amount of estimation? Which has the most precision? Explain.
c.
How did you indicate the differences in the precision in your measurements?
11.
Measuring Volume:
Determine the volume of H
2
O in the following graduated cylinders, using the correct
sig figs. Remember to read at the bottom of the meniscus.
a.
b.
c.
d.
e.
12.
Identify the number of significant figures (you do not need units on sig figs):
a.
3.0800 kg
b.
0.00418 m
c.
7.09
×
10
–5
L
d.
91,600 miles
e.
0.003005 g
f.
38 books
g.
3.200
×
10
9
s
h.
250 °C
i.
780,000,000 km
j.
20 years in one score
k.
0.0101 mL
l.
0.00800 cm
m.
20,700 inches
n.
5.0002
×
10
8
J
Answers: 5. % Error (B) = 5%; % Error (C) = 6.9%; 7. % Error = 0.01%, 0.03%, 0.13%
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '10
 Casagranda
 Sig Figs

Click to edit the document details