Sig Fig Worksheet - DOC

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					Sig Fig Worksheet
NAHS AP Chemistry

1. Round the following numbers off to the number of digits shown after the number in parenthesis.
          A. 30.48 cm (2)
          B. 746 W (1)
          C. 7.36 x 1022 kg (2)




2. Determine the number of significant digits in each of the following:
         A. 0.0821
         B. 8.31 J/mol K
         C. 299,000,000 seconds
         D. 6.02 x 1023 atoms




3. Write the number with the correct number of significant digits shown in parenthesis after the number
          A. 9.109 x 10-31 kg (3)
          B. 1.99 x 1030 kg (2)
          C. 1.602 177 x 10-19 C (4)
          D. 6.62607 x 10-34 atoms (5)




4. Write the following numbers in scientific notation
          A. 602 200 000 000 000 000 000 000 atoms
          B. 0.000 000 000 06672 seconds
          C. 3600.00 
 L




5. Do the following calculation and write the number with the correct number of significant digits (remember the
label)
          A. (8.31 x 102 m ) ( 360 s)

          B. (0.0821 ) (1.00 atm)

          C. (6.02 x 1023 particles) / ( 1.00 mol )




6. Do the following conversions, use the correct unit labels
          A. 5.00 cm to meters

          B. 500 g to kilograms

          C. 500 g to L

         D. 2.0g of Al to atoms                                           * Adapted from www.hawkeyecollege.edu
7. When sulphur trioxide (SO3), which is present in smoggy air in trace concentrations, reacts with water,
sulphuric acid (H2SO4), a very corrosive acid, forms as the only product. Write a balanced equation for this
reaction.




8. Although bright and shiny, aluminum objects are covered with a tight, invisible coating of aluminum oxide, (Al2O3)
that forms when freshly exposed aluminum (Al) reacts with oxygen. Write the balanced equation for this reaction.




9. How many moles of sodium chlorate are needed to produce 0.33 moles of sodium chloride according to the
following chemical equation?

NaClO3 ---->           NaCl    +       O2




10. How many grams of sodium carbonate and calcium chloride are needed to prepare 15.50 grams of calcium
carbonate?

Na2CO3    +       CaCl2       CaCO3     +     NaCl

				
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