BME 350 QUIZ 3 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. True or false: a solute can diffuse when placed in a liquid
solvent, but a solute cannot diffuse when it is in a solid
solvent.
Answer:
false
Question:
2. What is the key difference between bulk flow of a
material and diffusion flow of a material
Answer:
the cause of matter flow
Question:
3. What causes flow of matter by diffusion
Answer:
concentration gradient
Question:
4. From a thermodynamic perspective, diffusion is driven by
______
Answer:
gibbs free energy gradient
Question:
5. the gibbs free energy gradient is the primary driver of
diffusion, but what is meant by gibbs free energy
gradient?
Answer:
maximum reversible work that can be done by a system at constant T and P
Question:
6. The change in Gibbs Free energy is equal to the:
Answer:
work done by the system to its surrounding minus the work of the pressure forces
, Question:
7. materials engineers consider gibbs free energy to predict
the direction of a reaction if two conditions are specified.
These conditions are:
Answer:
temperature, pressure
Question:
8. If the Gibbs free energy of a process is determined to be
positive, then the reaction will _____
Answer:
not occur spontaneously
Question:
9. Which equation best describes the Arrhenius relationship
Answer:
y=A exp(-B/KT)
Question:
10. How many experimental test are needed to get the first
preliminary estimate for B in the Arrhenius equation?
Answer:
2 (2 points define a line)
Question:
11. 2 experiments can be performed to get info about the
values of B and C in the Arrhenius equation y=C exp(-
B/RT) by____
Answer:
taking logs and plotting the results
Question:
12. What parameters are obtained by taking the logs and
plotting the results of the Arrhenius equation?
Answer:
the value of C(y intercept), Activation energy of the system Q(from slope)
CORRECT ANSWERS
Question:
1. True or false: a solute can diffuse when placed in a liquid
solvent, but a solute cannot diffuse when it is in a solid
solvent.
Answer:
false
Question:
2. What is the key difference between bulk flow of a
material and diffusion flow of a material
Answer:
the cause of matter flow
Question:
3. What causes flow of matter by diffusion
Answer:
concentration gradient
Question:
4. From a thermodynamic perspective, diffusion is driven by
______
Answer:
gibbs free energy gradient
Question:
5. the gibbs free energy gradient is the primary driver of
diffusion, but what is meant by gibbs free energy
gradient?
Answer:
maximum reversible work that can be done by a system at constant T and P
Question:
6. The change in Gibbs Free energy is equal to the:
Answer:
work done by the system to its surrounding minus the work of the pressure forces
, Question:
7. materials engineers consider gibbs free energy to predict
the direction of a reaction if two conditions are specified.
These conditions are:
Answer:
temperature, pressure
Question:
8. If the Gibbs free energy of a process is determined to be
positive, then the reaction will _____
Answer:
not occur spontaneously
Question:
9. Which equation best describes the Arrhenius relationship
Answer:
y=A exp(-B/KT)
Question:
10. How many experimental test are needed to get the first
preliminary estimate for B in the Arrhenius equation?
Answer:
2 (2 points define a line)
Question:
11. 2 experiments can be performed to get info about the
values of B and C in the Arrhenius equation y=C exp(-
B/RT) by____
Answer:
taking logs and plotting the results
Question:
12. What parameters are obtained by taking the logs and
plotting the results of the Arrhenius equation?
Answer:
the value of C(y intercept), Activation energy of the system Q(from slope)
