Chapter 3 Review Sheet                                                         Name____________________________________

 

Write the number of significant figures in the blank.

1._____ 2304                          4._____ 0.02340                     7._____ 150010                      10._____ 9.760

2._____ 2340                          5._____ 2.603                         8._____ 1.5 x 106                    11._____ 0.00340

3._____ 2.340                         6._____ 150000                      9._____ 2.40 x10-3                  12._____ 105600

Round the following numbers to 3 significant figures.

13.____________ 1844863                15.____________ 0.0067987             17.____________ 2503

14.____________ 4                            16.____________ 6.8578                   18.____________ 30409

Answer to the following with the correct number of significant figures. Circle your answer

19. 6.35 + 41.487 =                                                     20. 23.339 - 16.1 =

21. 6.8 x 105  + 3.52 x 105 =                                                     22.  3.2 x 10-3  - 7.9 x 10-4 =

23. 593 x 20 =                                                             24. 3210 x 460  =

25.                                                               25.

Using different rulers, Bruce and Pete each measure the length of the same object three times.

26. Bruce’s three measurements are 19 cm, 20 cm, and 22 cm. Calculate the average value of his measurements and express the answer with the correct number of significant figures.

 

27. Pete’s three measurements are 20.9 cm, 21.0 cm, and 21.0 cm. Calculate the average value of his measurements and express the answer with the correct number of significant figures.

 

28. Whose measurements are more precise?

 

29. The actual length of the object is 20.0 cm. Whose measurements are more accurate?

 

30. What is the error of Pete’s average measurement?

 

31. What is the percent error of Pete’s average measurement?

 

Complete the following tables

Quantity measured

Base unit

Symbol

 

Prefix

Abbreviation

Meaning

Length

 

 

 

milli

 

 

Mass

 

 

 

 

k

 

 

 

L

 

centi

 

 

Temperature

 

 

 

 

 

 

degree Celsius

 

 

 

 

1,000,000,000 times smaller

Energy

 

 

 

 

 

 

 

 

cal

 

 

 

 

Problems. Answer the following questions. Show your work, include the units, and use the correct number of significant figures.

 

32. A piece of metal has a mass of 46.7 g and a volume of 3.7 mL. What is its density?

 

 

33. 520 mL of gasoline has a mass of 473 g. What is its density?

 

 

34. What is the density of a block of wood with the following dimensions

            Length             15.24 cm

            Width              6.23 cm

            Height             3.56 cm

            Mass                253 g

 

35. The density of a piece of metal is determined by the water displacement method. The metal had a mass of 23.47 g. A graduated cylinder was filled with 27.3 mL of water and after the metal was added the volume was 33.7 mL. What is the density?

 

 

36. A chemical reaction takes place at 20°C. What is this temperature in Kelvins?

 

 

37. A typical refrigerator keeps food at 277 K. What is this temperature in degrees Celsius?

 

1 L  = 1.057 qt

1 gram = 0.0353 oz

1 kg = 2.20 lbs

1 inch = 2.54 cm

 
 
 


38. How many mL are in 0.037 quarts?

 

 

 

39. How many micrograms are in 6.8 x 10-7 ounces?

 

 

 

40. Calculate the length in km of a sign 25.0 inches long.

 

 

 

41. Find the mass in grams of 327 mL liters of Al. The density of Al is 2.70 g/cm3.

 

 

 

42. Convert the density of Al to pounds/quart. The density of Al is 2.70 g/cm3.

 

 

 

43. A molecule is traveling at a speed of 420 meters per second. What is its speed in miles per hour?