# Chapter 1 - Matter: Its Properties and Measurement - Exercises - Significant Figures - Page 27: 20

a) ambiguous b) 3 significant figures c) 2 significant figures d) 5 significant figures e) 4 significant figures f) ambiguous g) 3 significant figures h) ambiguous

#### Work Step by Step

a) 450 There is one terminal zero that precede the decimal point in a quantity bigger than one, so this case is ambiguous. b) 98.6 All the digits are significant, since they are nonzero digits. So this number has 3 significant figures. c) 0.0033 All the zeros preceding the first nonzero digit are not significant. So this number has 2 significant figures. d) 902.10 The zeros between nonzero digits and at the end of the number to the right of the decimal point are significant. So this number has 5 significant figures. e) 0.02173 All the zeros preceding the first nonzero digit are not significant. So this number has 4 significant figures. f) 7000 There is three terminal zeros that precede the decimal point in a quantity bigger than one, so this case is ambiguous. g )7.02 The zero between nonzero digits is significant. So this number has 3 significant figures. h) 67,000,000 There is six terminal zeros that precede the decimal point in a quantity bigger than one, so this case is ambiguous.

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