Principal Investigators Susan Ross Lon J. Mathias Sharon Walker

Excellent! Please print out a copy of your quiz with the correct answers and hand it in to your lab instructor.

"; // Message to display if any are wrong. var ifWrong = "

Sorry. You missed the questions listed below. Please review the material and try again. Remember, you cannot perform the lab until you have succesfully completed the quiz.

"; // Create four question objects... quiz = new makeArray(10); quiz[0] = new makeQuestion("What does this computer have in common with a model airplane?", 2, "both are useless hunks of plastic", "you work too hard for the meager satisfaction of putting them together correctly", "both have bodies made of polystyrene", "nothing"); quiz[1] = new makeQuestion("What's so special about syndiotactic polystyrene?", 3, "it has a regular structure", "it can crystallize", "it has a melting temperature of 270^oC", "All of the above"); quiz[2] = new makeQuestion("What does a teenager with acne have in common with a free radical vinyl polymerization?", 2, "raging hormones", "low self-esteem", "both may use benzoyl peroxide", "smelly, toxic chemicals"); quiz[3] = new makeQuestion("What are the three steps of free-radical polymerization?", 1, "propigation disproportionation, coupling", "initiation, propigation, termination", "initiation, propigation, disprportionation", "coupling, chain transfer, branching"); quiz[4] = new makeQuestion("The rate of a free radical vinyl polymerization depends mainly on what two things?", 2, "polymer concentration and the size of the reaction vessel", "initiator concentration and the square root of the monomer concentration", "monomer concentration and the square root of the initiator concentration", "the weather outside and the phase of the moon"); quiz[5] = new makeQuestion("Why should the polymerization in this experiment only be carried out to ~10% conversion?", 3, "to keep the polymer from gelling in the expensive dilatometer", "initiator and monomer concentrations will remain relativly constant", "at higher conversions, the change in volume becomes too small to measure with a dilatometer", "A and B", "All of the above"); quiz[6] = new makeQuestion("When the dilatometer is placed into the constant temperature bath, the initial increse in the volume is due to. . .", 1, "the styrene trying to get out of the hot water", "thermal expansion", "expansion due to polymerization", "a change in the pressure in the dilatometer"); quiz[7] = new makeQuestion("Why is dodecyl mercaptan used in this experiment?", 0, "to examine the effects of a chain transfer agent on polymerization rate", "to initiate polymerization", "it is used as an endcapper", "No reason. Just something else to dump into the reaction"); quiz[8] = new makeQuestion("Dilatometry is not useful in step growth polymerization because. . .", 3, "it was designed for use with free radical polymerization", "high molecular weight polymers are not formed until the reaction reaches high conversion", "Dr. Mathias says so", "a small molecule condenses out of the reaction mixture resulting in little or no volume change"); quiz[9] = new makeQuestion("If the monomer concentration was doubled and the initiator concentration was increased by nine, how much faster would the reaction go?", 2, "2 times", "4 times", "6 times", "10 times"); // --> Free Radical Polymerization Kinetics by Dilatometry: Pre-lab Quiz

Name: ________________________________________ Date: ____________________

Correct Quiz