Using Measurements Worksheet

Name Block Date Using Measurements – Ch. 2

PART A – ACCURACY, PRECISION, & PERCENT ERROR 1. Each of five students used the same ruler to measure the length of the same pencil. These data resulted: 15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm. The actual length of the pencil was 15.85 cm. Describe whether accuracy and precision are each good or poor for these measurements.

2. A chemistry student measured the boiling point of naphthalene (C10H8) at 231.0C. What is the percent error for this measurement if the literature value is 217.9C?

PART B – SIGNIFICANT FIGURES 3. ______Using the thermometer on the right, record the temperature in degrees Celsius. Show the correct number of significant figures.

Determine the number of significant figures in each of the following:

4. 3.57 m 6. 0.004 m3

5. 20.040 g 7. 730 000 kg

Perform the following calculations and express your answers in the correct units and number of significant figures.

8. (5.14 cm)(6.742 cm) = 11. 45.68 g 13. 1,423 mL 2.8 g + 3 .2 g - 40 mL 9. - 3 = 6.86 10 L 12.

PART C – SCIENTIFIC NOTATION Convert the following numbers into or out of scientific notation. Remember to keep the same number of significant figures.

14. 0.00003 cm 14. 1.05  105 mm ______

15. 8,600,000 g 15. 1.00  10-3 m ______

Using Measurements – Ch. 2 Using Measurements – Ch. 2 Name ______Block _____ Date ______Units & Unit Conversions – Ch. 2

PART A – SI UNITS What type of measurement is indicated by each of the following units? Choices are in the last column. 1. g/mL density 5. g 9. mg length 2. s 6. cm3 10. L mass 3. km 7. mm 11. g/cm3 time 4. volume 8.

PART B – DENSITY 12. A small gold nugget has volume of 0.87 cm3. What is its mass if the density of gold is 19.3 g/cm3?

13. What volume is occupied by 35.2 g of carbon tetrachloride if its density is 1.60 g/mL?

PART B – UNIT CONVERSIONS Perform the following SI prefix conversions: 14. 25 kg = g 16. 0.36 mm = m 15. 9.3 mL = L 17. 24 cm = km

18. How many kilometers are there in 3.4 miles?

19. If a man’s mass is 180 pounds, find his mass in grams.

20. How many kilograms is a 43.5-in3 sample of silver if the density of silver is 10.5 g/cm3?

21. How many quarts are there in 13 cases of cola if each can is 12 ounces and each case contains 24 cans. (1 quart = 32 ounces)