Dilute Solution Viscometry: Pre-lab Quiz

Name: ________________________________________ Date:_______________

1. Why do polymers make solutions viscous?

Polymers move slowly
Large polymers block the motion of small molecules
Intermolecular attractions can cause the solvent molecules to become bound to the polymer
All of the above
2. What instrument is used in this lab for measuring viscosity?
Brookfield Viscometer
Cannon-Ubbelohde Viscometer
Gardner Viscosity Tubes
Fenske Viscometer
3. Which equation is used to calculate the relative viscosity?
t/to - 1
y = mx + b
efflux time of solution / efflux time of solvent
Mark - Houwink equation
4. Where does the Happy Hattson Family live?
Athens, Alabama
Lecanto, Florida
Forestdale, Wisconsin
In your own back yard
5. Which molecular weight average is calculated in this lab?
number average molecular weight
viscosity average molecular weight
weight average molecular weight
None of the above
6. Through which tube is the solution introduced into the viscometer?
A
B
C
H
7. What value is calculated by dividing the specific viscosity by the concentration of the solution?
reduced viscosity
intrinsic viscosity
inherent viscosity
more specific viscosity
the value of a dollar
8. How is the intrinsic viscosity determined?
by finding the y-intercept of a plot of reduced viscosity vs. concentration
by finding the y-intercept of a plot of inherent viscosity vs. concentration
ln reletive viscosity / concentration
Both A and B
9. How is molecular weight determined from the intrinsic viscosity?
by using the Mark - Houwink equation
by finding the square of the slope of the line
by multiplying the square root of the intrinsic viscosity by 3
None of the above
10. True or false: The K and a values in the Mark - Houwink equation are the same for all polymer - solvent systems.
true
false
neither
you tell me
Correct Quiz