2. Units of Measurement
   
   1. Why are standards needed for measured quantities?
      
   2. Label each of the following measurements by the quantity each represents. For instance, a measurement of 10/6 kg/m3 represents density.
      a) 5.0 g/mL
      b) 37 s
      c) 47 J
      d) 39.56 g
      e) 25.3 cm3
      f) 325 ms
      g) 500 m2
      h) 30.23 mL
      i) 2.7 mg
      j) 0.005 L
      
   3. Convert the following showing all work, conversion factors and cancellation of units:
      a) 10.5 g into kg (0.0105 kg )
      b) 1.57 km into m ( 1570 m )
      c) 3.54 microg into g ( 0.000 003 54 g )
      d) 3.5 mol into micromol ( 3 500 000 micromol )
      e) 1.2 L into mL ( 1200 mL )
      f) 548.6 mL into cm3 ( 548.6 cm3 )
      
   4. Write the conversion factors to represent the following equalities:
      a) 1 in = 2.54 cm
      b) 1 microg = 0.000 001g
      c) 1 Mm = 1 000 000 m
      
   5. For each of the following show given information, conversion factors, set up, unit cancellation and the answer boxed.
      a) What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6 cm3? (1.71 g/cm3)
      b) What volume would be occupies by 7.75 g of this same substance? ( 4.53 cm3)
      
   6. a) Express 16.45 m in cm showing given information, conversion factors, set up, unit cancellation and the answer boxed.
      b) Express 16.45 cm in km given information, conversion factors, set up, unit cancellation and the answer boxed.
      
   7. Express the mass of 0.014 mg in g, showing given information, conversion factors, set up, unit cancellation and the answer boxed.
      
   8. Define conversion factor.
      
   9. A sample of a substance that has a density of 0.824 g/mL has a mass of 0.451 g. Calculate the volume oof the sample, showing given information, conversion factors, set up, unit cancellation and the answer boxed. ( 0.547 mL )
      
   10. Convert 882 microg to g showing given information, conversion factors, set up, unit cancellation and the answer boxed. ( 8.82 x 10-4 g )
       
   11. Convert 92.25 m to km showing given information, conversion factors, set up, unit cancellation and the answer boxed. ( 9.225 x 10-2 km )
       
   12. Convert 9.225 x 10-2 km to cm showing given information, conversion factors, set up, unit cancellation and the answer boxed. ( 9.225 x 103 cm )
       

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