2. The product of 2 × 104 cm and 4 × 10–12 cm, expressed in scientific notation is ____.

3. According to rounding rules for addition, the sum of 27. 1, 34
According to rounding rules for addition, the sum of 27.1, , and is ____.

4. The accepted value for the density of iron is 7. 87 g/cm3
The accepted value for the density of iron is 7.87 g/cm3. A student records the mass of a cm3 block of
iron as grams. What is the percent error for the density measurement?

5. How many significant digits are in the value 0.0050340?

6. Which term describes the amount of mass contained per unit volume?
a. mass b. temperature
c. length d. density

7. An object has a mass of 26. 94 grams and a volume of 2
An object has a mass of grams and a volume of cubic centimeters. What material is it likely to be
made of?
Substance
iron
gold
silver
copper
Density (g/cm3)
7.874
19.32
10.49
8.92

8. Three students measured the length of a stamp, which had an accepted value of 2.71 cm. Which student’s
measurements were most precise?

9. Which value has only 4 significant digits?
a b
c d

10. The accepted value is 1.43. Which correctly describes this student’s experimental data?
Trial
Measurement 1
1.29 2
1.93 3
0.88

11. What is the product of these numbers, to the appropriate number of significant digits?
56.2 × =

12. What term is described as the amount of matter in an object?

13. A bottle contains 3. 100 mL of a liquid
A bottle contains mL of a liquid. The total mass of the bottle and the liquid together is g. The mass of the empty bottle is g. What is the density of the liquid?

14. What is the sum of these values, to the appropriate number of significant digits?=

15. The distance from my house to school is 4 miles
The distance from my house to school is 4 miles. Calculate this distance in meters up to three significant digits. 1 mile = 1609 meters

16. A car covers a distance of 235. 3 km in 0. 08 h
A car covers a distance of km in 0.08 h. Calculate its speed in meters per second.

17. A vessel contains 50 mL of water. A sample of 2
A vessel contains 50 mL of water. A sample of 2.0 g of a metal is dropped into this vessel, raising the level of water in it to 90 mL. What is the density of the metal sample?

18. Convert 1000 years into seconds
Convert 1000 years into seconds. Express your answer in scientific notation using the correct number of significant figures.

19. Mrs. Jenkins was pulled over on her way from Beaumont to Orange by an officer claiming she was speeding. The speed limit is 65 mi/hr and Mrs. Jenkins had traveled 135 km in 60 minutes. How fast was Mrs. Jenkins' average
speed? Does she deserve a ticket? 1 km = miles

20. A pencil is 10 cm long. How many pencils would fit in the length of a football field (100 yards)? 1 inch = 2.54 cm; 3 ft = 1 yd; 1 ft = 12 in

21. How many nanoseconds are in 9 years? 1 s = 1 x 109 ns