Practice Problems 1 Chapter 1 CHE 151
Graham/08
Exponential Notation, Significant Figures and Rounding
1. Write each number in scientific (exponential) notation and then indicate the number
of significant figures.
Scientific Notation # of Sig.Fig.
a) 9624 __9.624 x 103_________ ____4_______
b) 620.0 __6.200 x 102_________ ____4_______
c) 0.00892 __8.92 x 10-3_________ ____3_______
d) 5.990 x 104 xxxxxxxxxxxx ____4_______
e) 0.82 __8.2 x 10-1_________ ____2_______
f) 500.060 __5.00060 x 102______ ____6_______
g) 4.82 x 10-4 xxxxxxxxxxxx ____3_______
h) 5000.0 __5.0000 x 103______ ____5_______
i) 5000 __5 x 103__________ ____1_______
2. Round each of the following to three significant figures, then rewrite the number in
scientific notation.
a) 25.67 = 25.7 2.57 x 101
b) 694.2 = 694 6.94 x 102
c) 0.056567 = 0.0566 5.66 x 10-2
d) 460500 = 461,000 4.61 x 105
e) 851.5 x 10-4 = 852 x 10-4 8.52 x 10-2
