PHA 317 Exam 2 Terms UPDATED
ACTUAL Questions and CORRECT
Answers
Rheology - CORRECT ANSWER - The study of the flow of matter (flow of liquids and
deformation of solids)
Viscosity - CORRECT ANSWER - Defined as the resistance to flow (η)
Fluidity - CORRECT ANSWER - Defined as the substance's ease of flow (ɸ)
Newtonian - CORRECT ANSWER - A fluid that when plotting applied pressure (P) vs.
flow rate gives a straight line through the origin
Poise - CORRECT ANSWER - Units of viscosity (CGS units g/cm*sec)
Stoke - CORRECT ANSWER - Units of kinematic viscosity (CGS units cm^2/s)
Non-newtonian - CORRECT ANSWER - These liquids don't follow Newton's equation of
flow and will exhibit one of the following:
-Plastic flow
-Pseudoplastic flow
-Dilatant flow
-Thixotropic flow
Plastic flow - CORRECT ANSWER - A type of Non-newtonian flow in which the liquid
does not flow until the applied shearing stress exceeds the minimum "yield value." Below YV
behaves as an elastic solid, above YV behaves as a Newtonian liquid. Typically exhibited by
concentrated suspensions
, Pseudoplastic flow - CORRECT ANSWER - A type of Non-newtonian flow in which the
liquid flows more readily with increase in shearing pressure (no yield value). Shown by
polymers in solution
Dilatant flow - CORRECT ANSWER - A type of Non-newtonian flow in which the
liquid's resistance to flow increased with application of stress. Shown by suspensions > 50% w/v
Thixotropic flow - CORRECT ANSWER - A type of Non-newtonian flow exhibited by
shear thinning systems when the shear is applied, resistance to flow progressively decreases.
These substances will retain their "thinned" state even once the shear is removed
Normal boiling point - CORRECT ANSWER - The temperature at which the solution's
vapor pressure equals the atmospheric pressure
Raoult's law - CORRECT ANSWER - Law that says relative lowering of vapor pressure is
equal to the mole fraction of solute in solution
Van't Hoff - CORRECT ANSWER - Equation that gives the osmotic pressure caused by
nondissociating solute in solution
Ostwald viscometer - CORRECT ANSWER - A device that measures the viscosity of
Newtonian fluids
Cup-and-bob viscometer - CORRECT ANSWER - A device that measures the viscosity of
non-Newtonian fluids; can operate at multiple rates of shear
Dyne - CORRECT ANSWER - Unit of force defined as g*cm/s^2
Erg - CORRECT ANSWER - Unit of energy defined as g*cm^2/s^2
ACTUAL Questions and CORRECT
Answers
Rheology - CORRECT ANSWER - The study of the flow of matter (flow of liquids and
deformation of solids)
Viscosity - CORRECT ANSWER - Defined as the resistance to flow (η)
Fluidity - CORRECT ANSWER - Defined as the substance's ease of flow (ɸ)
Newtonian - CORRECT ANSWER - A fluid that when plotting applied pressure (P) vs.
flow rate gives a straight line through the origin
Poise - CORRECT ANSWER - Units of viscosity (CGS units g/cm*sec)
Stoke - CORRECT ANSWER - Units of kinematic viscosity (CGS units cm^2/s)
Non-newtonian - CORRECT ANSWER - These liquids don't follow Newton's equation of
flow and will exhibit one of the following:
-Plastic flow
-Pseudoplastic flow
-Dilatant flow
-Thixotropic flow
Plastic flow - CORRECT ANSWER - A type of Non-newtonian flow in which the liquid
does not flow until the applied shearing stress exceeds the minimum "yield value." Below YV
behaves as an elastic solid, above YV behaves as a Newtonian liquid. Typically exhibited by
concentrated suspensions
, Pseudoplastic flow - CORRECT ANSWER - A type of Non-newtonian flow in which the
liquid flows more readily with increase in shearing pressure (no yield value). Shown by
polymers in solution
Dilatant flow - CORRECT ANSWER - A type of Non-newtonian flow in which the
liquid's resistance to flow increased with application of stress. Shown by suspensions > 50% w/v
Thixotropic flow - CORRECT ANSWER - A type of Non-newtonian flow exhibited by
shear thinning systems when the shear is applied, resistance to flow progressively decreases.
These substances will retain their "thinned" state even once the shear is removed
Normal boiling point - CORRECT ANSWER - The temperature at which the solution's
vapor pressure equals the atmospheric pressure
Raoult's law - CORRECT ANSWER - Law that says relative lowering of vapor pressure is
equal to the mole fraction of solute in solution
Van't Hoff - CORRECT ANSWER - Equation that gives the osmotic pressure caused by
nondissociating solute in solution
Ostwald viscometer - CORRECT ANSWER - A device that measures the viscosity of
Newtonian fluids
Cup-and-bob viscometer - CORRECT ANSWER - A device that measures the viscosity of
non-Newtonian fluids; can operate at multiple rates of shear
Dyne - CORRECT ANSWER - Unit of force defined as g*cm/s^2
Erg - CORRECT ANSWER - Unit of energy defined as g*cm^2/s^2
