General, Organic, and Biological Chemistry: Structures of Life (5th Edition)

Published by Pearson
ISBN 10: 0321967461
ISBN 13: 978-0-32196-746-6

Chapter 2 - Chemistry and Measurements - 2.2 Measured Numbers and Significant Figures - Questions and Problems - Page 32: 2.8


(a) Exact (b) Measured (c) Measured (d) Measured

Work Step by Step

(a) The number of students in the laboratory has to be exact, since it is impossible to have half a student or any fraction of a person. (b) This number is clearly estimated, and the time between two events is usually measured/estimated. (c) The mass of an object is always measured/estimated. (d) The mass of cholesterol in 1 dL of blood had to be measured. (directly or indirectly).
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