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CHEMISTRY 120
Name ___KEY___________
Quiz 1
1. Determine the number of significant figures in the following values:
a) 190.802 mL _______6__________
c) 7 whales _______1_______
b) 0.0010120 lb _______5_________
d) 5215 miles _______4_________
Round the following values to 3 significant figures:
a) 3.68801 _____3.69____
c) 0.0421975 ______0.0422_______
b) 8.75430 ____8.75_____
d) 4.0098 x 10–12 __4.01 x 10-12_____
2. Perform the following unitless calculations and round the final answer to the proper number of
significant figures. Assume that all of the numbers came from measurements.
a) 3.41 – 0.086652 = ____3.32____
c) 16 x 841.4 ÷ 16.300 = 8.3 x 102 or 830
b) 21.01 x 2.0 = 4.2 x 101 or 42
d) 14.044 + 8.11 x 3.4 = ___41.6______
3. Convert the following values into scientific notation. Note bar above number denotes the number of
sig figs:
a) 52,000 __5.200 x 104___
c) 250,000,000,000,000,000,000 _2.50 x 1020__
b) 0.0006 ___6 x 10-4___
d) 0.0000009548 _9.548 x 10-7___
4. Perform the following mathematical operations
10 4
= ___1017________
-13
10
5. Perform the following operations and express each answer in scientific notation:
a) (3.5 x 1013) (7.1 x 10-6) = __2.5 x 108____