Chemistry Practice: Sig Figs



Name__________ Sig Figs, Conversions, Density

1. Determine the number of sig figs in each of the numbers below:

a. 452

b. 2.081

c. 0.000 0247

d. 110.00

e. 3.5 x103

f. 9.010 x10-6

2. Round each number to the number of sig figs indicated (in parenthesis).

a. 0.028107 (1)

b. 0.005 (3)

c. 5 x104 (2)

d. 3.681 076 (3)

3. Perform the following calculations. Report your answers with the correct sig figs and units.

a. 35.6 g + 4.31 g =

b. 340 cm – 0.02 cm =

c. 19.00 s + 1.00 s =

d. 4.681 g / 5.2 cm3 =

e. (3 x103 m) x (6.0 x104 m) =

4. Perform the following conversion. Keep track of sig figs and units. Show all work!! Some calculations may involve more than one conversion.

a) 3.62 cm to m. Final Answer

b) 2.8 km to m. Final Answer

c) 1294 dimes to quarters. Final Answer

d) 0.3 years to min. Final Answer

e) 238415 (L to mL. Final Answer

f) 4.35 min to msec. Final Answer

5. What is the density of a sample of an element if it’s mass is 43.2 g and volume is 96.5 mL?

6. Mercury has a density of 13.6 g/mL. What is the volume of a sample of mercury that has a mass of 224 g?

7. A student determines the mass and volume of three samples of a liquid. Determine if the samples could be the same substance. If not, which ones could be? (Hint: all substances have unique and constant densities.) Don’t forget work!

Sample Volume Mass

A 116 ml 85 g

B 168 ml 101 g

C 158 ml 115 g

Density of A:

Density of B:

Density of C:

Final Answer:

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