Name

14. Ethylene glycol, C₂H₆O₂, is the liquid that is the base of the antifreeze you use in the 
      radiator of your car. It has a density of 1.1135 g/ml at 20 ^oC. If you need 500. ml of this 
      liquid, what mass of the compound, in grams, is required?

20. A sample of unknown metal is placed in a graduated cylinder containing water. If the mass 
      of the sample is 37.5 g, and the water levels before and after adding the sample to the 
      cylinder are as shown in the figure, which metal listed below is most likely the sample?

       This may be difficult to read. The actual image is on page 51 in 
                                         your textbook.

      Mg, d = 1.74 g/cm3

      Fe, d = 7.87 g/cm3

      Ag, d = 10.5 g/cm3

      Al, d = 2.70 g/cm3

      Cu, d = 8.96 g/cm3

      Pb, d = 11.3 g/cm3

22. Many laboratories use 25 ^oC as a standard temperature. What is this temperature in 
     Kelvin?

26. Solid gallium has a melting point of 29.8 ^oC. If you hold this metal in your hand, what is 
      its physical state? That is, is it a solid or a liquid? Explain briefly.

28. Give the name of each of the following elements: 

32. The average lead pencil, new and unused, is 19 cm  long. What is its length in 
      millimeters? In meters?

      mm   m

34. A standard US postage stamp is 2.5 cm long and 2.1 cm wide. What is the area of the 
     stamp in square centimeters? In kilometers? In centimeters?

     cm²  km  cm

44. What is the average mass of three objects whose individual masses are 10.3 g, 9.234 g, 
      and 8.35 g?

46. Solve the equation and report the answer in the correct number of significant figures: 
      22.86 cm  x  38.0 cm  x  76 cm

48 solve the equation, and report the answer in the correct number significant figures.

(0.0345)[25.35 - 2.4 / 1.678 x 10³]

56. Molecular distances are usually given in nanometers (1 nm = 1 x 10^-9 m) or in picometers 
     (1 pm = 1 x 10^-12 m). However,  a commonly used unit has been the Angstrom, where 1 A 
     = 1 x 10^-10 m. If the distance  between Pt atom atom and the N atom in the cancer 
     chemotherapy drug cisplatin is 1.97 A, what is the distance in nanometers? In picometers?

     nm  pm

62. A compound contains 65.0% platinum. If you have a 1.53 g sample of the compound, how 
      many grams of Pt can be recovered from the sample?

81. You are given a sample of a silvery metal. What information do you need to prove that the 
      metal is silver?

87. What experiment can you use to Separate salt from water? Separate iron filings from small 
      pieces of lead? Separate elemental sulfur from sugar?