40 points.
9. Key Concept How do measurements relate to
experimental science?
10. Key Concept How are accuracy and precision
evaluated?
11. Key Concept Why must a given measurement
always be reported to the correct number of significant figures?
12. Key Concept How does the precision of a calculated answer compare to the precision of the
measurements used to obtain it?
13. A technician experimentally determined the
boiling point of octane to be 124.1°C. The actual
boiling point of octane is 125.7°C. Calculate the
error and the percent error.
14. Determine the number of significant figures in
each of the following.
a. 11 soccer players
b. 0.070 020 meter
c. 10,800 meters
d. 5.00 cubic meters
15. Solve the following and express each answer in
scientific notation and to the correct number of
significant figures.
a. (5.3 104) (1.3 104)
b. (7.2 104) (1.8 103)
c. 104 103 106
d. (9.12 101) (4.7 102)
e. (5.4 104) (3.5 109)
9. Making correct measurements is fundamental to the experimental sciences.
10. Accuracy is the measured value compared
to the correct values. Precision is comparing more than one measurement.
11. The significant figures in a calculated
answer often depend on the number of
significant figures of the measurements
used in the calculation.
12. A calculated answer cannot be more precise than the least precise measurement
used in the calculation.
13. error = –1.6°C; percent error = 1.3%
14. a. unlimited
b. 5
c. 3
d. 3
15. a. 6.6 × 104
b. 4.0 × 10–7 c. 107
d. 8.65 × 10–1
e. 1.9 × 1014
