Chapter 3 Scientific Measurement Name______________



Chapter 2 Matter and Energy

2-3 Measurements and Calculations in Chemistry

1. How many significant figures are in each of these measurements?

a. 143 g d. 1.072 km

b. 0.074 cm e. 10,800 m

c. 8.750 x 10-2 ng f. 5.00 dm3

2. Round each of these measurements to three significant figures.

a. 0.0074983 x 104 mm e. .098995 cg

b. 1764.9 mL f. .01552 m

c. 87.073 m g. 9009 m

d. 4.3621 x 108 mm h. 629.55 m

3. Write each measurement in scientific notation and determine the number of significant figures in each.

a. 0.05730 m

b. 8765 dm

c. 0.00073 mm

d. 12 basketball players

e. 0.010 km

f. 507 thumbtacks

4. Express the rounded answer to each problem in scientific notation.

a. 5.3 x104 + 1.3 x 104 =

b. 7.2 x 10-4 =

1.8 x 103

c. 104 x 10-1 x 106 =

d. 9.12 x 10-1 - 4.7 x 10-2 =

e. 4.8 x 10-5 x 6.0 x 103 =

(2.0 x 10-2)

f. (5.4 x 104) x (3.5 x 109) =

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