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Chemistry, 7/e
Raymond Chang, Williams College
Physical Properties of Solutions

Internet Exercises

http://www.chemie.fu-berlin.de/chemistry/bio/aminoacid/phe_en.html
(http://www.chemie.fu-berlin.de/chemistry/bio/aminoacid/phe_en.html)

  1. Freie University of Berlin's Chemistry department contains an index of amino acids that are linked to a structure and a description of their physical properties. Learn more about phenylalanine at this address: http://www.chemie.fu-berlin.de/chemistry/bio/aminoacid/phe_en.html.
    1. Identify the hydrophilic parts of phenylalanine.
    2. Identify the hydrophobic parts.
    3. Suppose you had a mole of phenylalanine in a liter of water and a mole of NaCl in a liter of water, and the two components were separated by a semi-permeable membrane. At equilibrium, will the water level be greater in the phenylalanine side or the NaCl side? Or will they be equal?
osmosis
(http://members.tripod.com/~urila/)

  1. The ChemTeam offers tutorials on various subjects. Study the material provided on osmosis at the address, http://dbhs.wvusd.k12.ca.us/ColligProp/Osmosis.html, and answer the question below.
    1. If side A initially had a 2 molar concentration of NaOH, what initial concentration of the same compound would be needed to obtain the same result as shown in the diagram at the bottom of the page?
http://www.chem.ualberta.ca/~plambeck/che/p101/p01034.htm
(http://www.chem.ualberta.ca/~plambeck/che/p101/p01034.htm)

  1. Read through the material at http://www.chem.ualberta.ca/~plambeck/che/p101/p01034.htm available on molar stoichiometry at the University of Alberta and answer the following questions.
    1. Can a solution be solid? If so, what would you define as the solvent?
    2. Suppose you went to the dentist to get a tooth filled, and after telling him your interest in the chemical composition of the fillings, he told you it was composed of 0.05 g of silver and 0.1 g of mercury. Find the molality of the solution.
    3. Now, after having your teeth filled, you see an assistant preparing a mouthwash of some sort, pouring 2 moles of the cherry-flavored solute into a 250 mL bottle. Calculate the molarity of the solution.








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