BEYOND THE TEXTBOOK
A simplified numbering format is used to number and identify the type of question for “Beyond the Textbook” questions.
For example, 1.2-W signifies that chapter 1, question # 2 is a web-based question. The following question types will be
used throughout the various chapters.
Symbol
QUESTION TYPE
W
Web-Based
S
SciLinks Based
C
CD-ROM Based
L
Library or Reference Book Based
G
General Grouping of other types of questions
Since web sites move from time to time and new versions of CD’s are produced, etc., you may not find what you are
looking for at a particular location. If so, do not hesitate to look other places. Be sure to reference your answer if you use a
different reference.
CHAPTER 13
13.1-L Using The Merck Index or Handbook of Chemistry and Physics look up the temperature at which caffeine
sublimes at standard atmospheric pressure.
13.2-W Go to http://webbook.nist.gov/, then “NIST Chemistry WebBook” and then “Formula”:
(a) Enter CO2 and click on Phase Change. In the Phase Change Data, locate the temperature and the pressure at
the triple point. Compare the triple point data with that in Figure 13.17 in the textbook.
(b) Enter H2O and click on Phase Change. In the Phase Change Data, locate the temperature and the pressure at
the triple point. Compare the triple point data with that in Figure 13.17 in the textbook.
13.3-W Go to http://cst-www.nrl.navy.mil/lattice/, then click on “cubic close packed”, then “fcc(A1)” and then “see the
structure from several perspectives”:
(a) Draw the top view; indicate which atoms are in the first layer and which are in the second layer. Why is the
third layer not shown?
(b) Draw the front view; indicate which atoms are in the first layer and which are in the second layer. Does the
front view differ from the top view?
13.4-W Open http://www.lyo-san.ca/english/lyophilisation.html Using information at this site and from reference books,
compare the terms: lyophilization, freeze-drying, and sublimation.
13.5-L Use the Handbook of Chemistry and Physics to find the vapor pressure of ammonia, NH3, at different
temperatures.
(a) What is the boiling point of ammonia at 1 atm (760 torr)?
(b) Plot the vapor pressure of ammonia vs. temperature.
(c) Use your plot to estimate the boiling point of ammonia at 250 torr; at 600 torr.
13.6-L Use the Handbook of Chemistry and Physics to find the vapor pressure of acetone, C3H6O, at different
temperatures.
(a) What is the boiling point of acetone at 1 atm (760 torr)?
(b) Plot the vapor pressure of acetone vs. temperature.
(c) Use your plot to estimate the boiling point of acetone at 250 torr; at 600 torr.
13.7-L Use the Handbook of Chemistry and Physics to find a table of enthalpy of vaporization, ∆Hvap of organic
compounds.
(a) What is the molar enthalpy of vaporization of acetone, C3H6O, at its boiling point?
(b) What is the boiling point of acetone, as given in this table?
(c) Use the data in parts (a) and (b) to calculate the vapor pressure of acetone at 50.0 oC.
(d) Use the data in parts (a) and (b) to calculate the vapor pressure of acetone at 60.0 oC.
(e) Use the data in parts (a) and (b) to calculate the temperature at which acetone would have a vapor pressure of
600 torr.
13.8-L Use the Handbook of Chemistry and Physics to find a table of surface tension of liquids.
(a) What is the surface tension of methyl alcohol (methanol), CH3OH, in contact with air at or near room
temperature?
(b) What is the surface tension of water, H2O, in contact with air at or near room temperature?
(c) Explain this difference, based on the molecular structures of methyl alcohol and water, and the resulting
intermolecular attractions.
13.9-L Use the Handbook of Chemistry and Physics to find a table of viscosity of liquids.
(a) What is the viscosity of ethyl alcohol (ethanol), C2H5OH, at 30 oC?
(b) What is the surface tension of acetone, CH3COCH3, at 30 oC?
(c) Note that ethyl alcohol and acetone have the same molecular formula, C3H6O. Explain the difference in their
observed viscosities.
13.10-L Use the Handbook of Chemistry and Physics to find a table of viscosity of liquids. Plot the viscosity of acetone vs.
Kelvin temperature. Is the viscosity of this liquid directly proportional to Kelvin temperature?