Chapter 2 Online HW

If a measured quantity is written correctly, which digits are certain? A) The first digit only. B) All but the very last digit. C) All but last two digits. D) All the digits are certain.

B) All but the very last digit.

Convert to decimal: 1.15 × 10^−3

0.00115

Perform to the correct number of significant figures. 0.005 + 0.09879

0.104

In a certain grocery store, strawberries cost $6.88 per pound ( 6.88 dollars/lb ). What is the cost per ounce? Express your answer numerically to the hundredths place.

0.43 dollars/oz

Evaluate and round the answer appropriately. (16.83/15) − 0.46

0.7

Rank the following quantities in order of decreasing mass. 100 g 1 dg 1 cg 50 million ng 1 kg 1 Gg 50 cg

1 Gg 1 kg 100 g 50 cg 1 dg 50 million ng 1 cg

Convert to scientific notation: 1,232,000

1.232×10^6

Convert a volume of 1250cm^3 to cubic meters. Express your answer numerically in cubic meters.

1.25×10^−3m^3

Round to three significant figures. 1.2576522 × 10^4

1.26 × 10^4

Round to three significant figures. 1.429902×10^6

1.43 × 10^6

A cyclist rides at an average speed of 30mi/h. If she wants to bike 169km , how long (in hours) must she ride? Express your answer using two significant figures.

3.5 hours

Determine the number of significant figures in the measurement 77.09 m.

4

Perform to the correct number of significant figures. 2.5 + 1.777

4.3

Perform to the correct number of significant figures. 432 + 7.3 - 28.523

411

Evaluate and round the answer appropriately. 6 × 0.222 × 7.0

9

Acetone (fingernail-polish remover) has a density of 0.7857 g/cm3. What is the volume in milliliters of 7.38 g of acetone? Express your answer to three significant figures and include the appropriate units.

9.39 mL

How many square centimeters are in an area of 13.9inch^2 ? Express your answer numerically in square centimeters.

89.7 cm^2

How many significant figures are in 560101 kg?

6

How many significant figures are in 563131 kg?

6

Convert a length of 17.0m to inches. Express your answer numerically in inches.

669 inches

If a measured quantity is written correctly, which digits are uncertain? A) The last two digits. B) All the digits except for the first one. C) The last digit only. D) None of the digits are uncertain.

C) The last digit only.

How many significant digits are there in exact numbers? A) Exact numbers have only eight significant figures. B) Exact numbers have only three significant figures. C) All the figures written in the exact number are significant. D) Exact numbers have an unlimited number of significant figures.

D) Exact numbers have an unlimited number of significant figures.

What are the abbreviations for a milliliter, a megameter, and a centigram, respectively?

mL Mm cg

Convert to decimal: 5.37×10^−12

0.00000000000537

The average U. S. farm occupies 435 acres. How many square miles is this? (1 acre = 43,560 ft2; 1 mi=5280ft)

0.680 mi^2

Round to three significant figures. 5.5560000

5.56

What kinds of numbers are exact? Check all that apply. A) Defined quantities (e.g., 1000 mL in 1 liter). B) The readings of the thermometer. C) Integers that are part of a mathematical equation (e.g., 4πr33) D) Measurements that can be counted, such as the number of students in class.

A) Defined quantities (e.g., 1000 mL in 1 liter). C) Integers that are part of a mathematical equation (e.g., 4πr33) D) Measurements that can be counted, such as the number of students in class.

Convert to scientific notation: 167,190,000

1.6719 × 10^8

Evaluate and round the answer appropriately. 0.411 + 9.9 + 0.8

11.1

Acetone (fingernail-polish remover) has a density of 0.7857 g/cm3. What is the mass in grams of 14.16 mL of acetone? Express your answer to four significant figures and include the appropriate units.

11.13 g

Perform to the correct number of significant figures. 1455.7 + 9.77 + 4.32

1469.8

How many significant figures are in 0.00056 kg?

2

Determine the number of significant figures in the measurement 0.000450 s.

3

How many significant figures are in 5.63×10^5 kg?

3

Round the value 44.981 g to three significant figures.

45.0 g

Round to three significant figures. 5.11188 × 10^−5

5.11 × 10^−5