1 5 Uncertainty in Measurement by PV96CoQt

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									Name _________________________________________                           Date _________________________ Period ____

                                       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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