1 5 Uncertainty in Measurement by PV96CoQt

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Homework
Chapter 1: Introduction: Matter and Measurement
Exercises: Sections 1.5 Uncertainty in Measurement
1. Indicate which of the following numbers are exact numbers by placing a checkmark by those numbers that ARE exact.
_______ (a) the mass of a 32-oz can of coffee

_______ (b) the number of students in your chemistry class

_______ (c) the temperature of the surface of the sun

_______ (d) the mass of a postage stamp

_______ (e) the number of milliliters in a cubic meter of water

_______ (f) the average height of students in your school

2. Indicate the number of significant figures in each of the following measured quantities:
(a) 1.689 x 10 3 km        _______

(b) 0.0234 m2              _______

(c) 7,194,300 cm           _______

(d) 435.983 K              _______

(e) 204.080 g              _______

3. Round each of the following numbers to three significant figures, and express the result in standard exponential notation:
(a) 143, 700 m             ____________________

(b) 0.09750 g              ____________________

(c) 890,000 L              ____________________

(d) 6.764 x 10 4 s         ____________________

(e) 33, 987.22 cm2         ____________________

(f)                        ____________________

4.       (a) The diameter of the Earth at the equator is 7926.381 mi. Round this number to three significant figures, and express it in

standard notation. __________________________

(b) The circumference of Earth through the poles is 40, 008 km. Round this number to four significant figures, and express

it in standard notation. ______________________

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5. Carry out the following operations, and express the answer with the appropriate units and number of significant figures:
(a) 320.55 g/cm3                      3
)                    ____________________

(b) [(285.3 x 10 5 m) – (1.200 x 10 3 m)] x 2.8954 m           ____________________

(c) (0.0045 mm x 20,000.0 mm) + (2813 mm x 12 mm)              ____________________

(d) 863 km x [1255 km2                    108 km)]             ____________________

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