Answer these questions before class on Wednesday, January 26th. Be sure to review these notes before answering.

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First Name: Last Name:

Laboratory Section:

1. How many significant figures in each of the following numbers?

a) The number of significant figures in the number 2001 is .

b) The number of significant figures in the number 1.01 x 10-5 is .

c) The number of significant figures in the number 22.04030 is .

d) The number of significant figures in the number 0.00480 is .

 

2. Determine the result of the following calculation to the correct number of significant figures.

a) 97.381 + 4.2502 =

b) 72.915 – 8.23 =

c) (9.15 + 4.1 + 2.8 + 3.175) / 4 = (assume the number 4 is exact)

d) ((8.925 – 8.904)/8.925) x 1.35 =

e) (6.626 x 10-34 x 2.998 x 108)/2.54 x 10-9 =

 

3. Perform the following conversion and report the answer to the correct number of significant figures.

a) 8.43 cm to mm.

b) 4.48 g to lbs

c) 1 km2 to ft2

d) 2.70 g/mL to lbs/foot3