b) no. precipitation occurs only through interactions that are irrespective of concentration.
2. Based on its structure, would potassium persulfate be a good initiator for bulk polymerization of styrene?
a)
no. salts do not dissolve in solvents with low dielectric constants
b) yes. styrene is nonpolar and so is KPS
c) no. salts dissolve in any polar solvent. styrene is nonpolar.
d) yes. because of its resonance structures, styrene can dissolve charged molecules
3. Look up the mechanism for radical formation from potassium persulfate (KPS) and benzoyl peroxide. How many radicals does KPS produce?
a) KPS produces 2 radicals
b) KPS produces 1 radical
c) KPS produces 4 radicals
d) KPS produces 3 radicals
4. Based on the possible intermolecular interactions, which bulk polymer would you expect to be a more rigid material, polystyrene or poly(methyl methacrylate)?
a) polystyrene
b) poly(methyl methacrylate)
5. Look up the structure of mequinol and decide why aqueous sodium hydroxide can remove it from styrene.
a) NaOH converts it to a sodium phenoxide salt which is water soluble.
b) NaOH decomposes the molecule into water soluble fragments
c) NaOH removes the methyl ether which causes the charged phenol to become water soluble
d) NaOH causes the mequinol to become mequinone which is water soluble