Significant Figures, Conversions, Density
Chemistry
Name: _________________________
Date:_______________Period:______
Answer all questions, showing work as required.
A. How many significant figures does each of the following numbers contain?
1. 5.432 g
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2. 2500.00 cm
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3. 3.58 x 10-9 nm
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4. 1.00 x 103 lb
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5. 0.00056 ML
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B. Do the appropriate calculations for each of the following:
6. 12 cm + 0.031 cm + 7.969 cm
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7. 2.3 x 102 g + 4.62 x 102 g + 3.852 x 103g
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8. 0.0653 g + 0.08538 g + 0.07654 g + 0.0432 g
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9. 62.47 g – 39.9 g
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10. 40.081 mL – 29.094 mL
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11. 2.89 cm x 4.02 cm
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12. 9.13 x 10-4 cm x1.2 x 10-3 cm
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13. 109.3758 m2 / 5.813 m
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14. 6.023 x 1023 g / 8.513 x 1012 g
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C. Do the following problems (remember D= m/v):
15. What is the density of a wood block that has a volume of 5.0 mL and a mass of 30.5 g?
16. What volume would a rock occupy if it had a mass of 31.2 g and a density of 10.4 g/mL?
17. Calculate the mass of a wooden block that is 4 cm x 2cm x 6 cm, and has a density of 0.5 g/cm3? (V = lxwxh)
D. Solve the following conversions:
18. Two objects are separated by 60 miles. What is this distance in km? ( 1 mile = 1610 meters; 1 m = 1000m)
19. A student has a mass of 300 kg. How much does he weigh in pounds? (1 kg = 1000g ; 454 g = 1 pound)
20. Express the mass of a 1400 mg cockroach in ounces. ( 1000 milligram =1 g; 28.35 grams = 1 ounce)
21. The skyrocket you shot off on the Fourth of July traveled at a speed of 145.6 m/s. What is the rockets speed
in km/hr? (1000 m = 1 km)