Chemistry Practice: Sig Figs

[Pages:1]Chemistry Practice: Sig Figs

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

a.) ______ 452

g.) ______ 780 000

b.) ______ 2.081

h.) ______ 0.000 0247

c.) ______ 45 000

i.) ______ 110.00

d.) ______ 0.035

j.) ______ 3.5 x103

e.) ______ 1.00

k.) ______ 0.02

f.) ______ 0.0080

l.) ______ 9.010 x10-6

m.) ______ -0.008 n.) ______ 58.04 o.) ______ 800 p.) ______ 0.300 q.) ______ 2.80 x102 r.) ______ 400.

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

a.) ___________________ 254.6381 (3)

k.) ___________________ 5 x104 to (2)

b.) ___________________ 0.028107 (1)

l.) ___________________ 3.681 076 (3)

c.) ___________________ 5 (3)

m.) ___________________ 56.0 (2)

d.) ___________________ 2000 (2)

n.) ___________________ 76.00 (1)

e.) ___________________ 0.00532 007 (4)

o.) ___________________ 0.5 (3)

f.) ___________________ 247 081 352.4 (2)

p.) ___________________ 300 to (2)

g.) ___________________ 0.005 (3)

q.) ___________________ 2.87301 x10-2 (1)

h.) ___________________ 4.24036 x105 (2)

r.) ___________________ 6.02 x10-4 (2)

i.) ___________________ 87 356.092 (4)

j.) ___________________ 22 (1)

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

2.0 km + 3.0 km

4 m x 3 m

36.4 ml - 0. 4 ml

36.1 mg = 0.44 s

6.10 g + 3.0 g

29.7 s + 0.3 s

6525 cm x 3.4 cm

0.08655 kg - 0.033 kg

0.05 s x 3520 s

96.153 g =

19.4 cm 3

1.0x105 m x 2.0x103 m

(29.7 g + 0.3 g) = 0.026 hr

a.) Average of: 132 g/mol, 136 g/mol, 129 g/mol, 134 g/mol:

b.) Convert 482 inches to feet:

e.) 2.50 x105 cm3 = _______________ dm3

c.)

0.500 lbs.

=

(0.030 in. x 0.02in.)

d.) 2.0 g = _______________________ kg

f.) 5.0kg = ______________________ g

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