BME 350 Quiz 3 review 2024| questions and Answers
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. ** Answ** false
What is the key difference between bulk flow of a material and diffusion flow of a
material ** Answ** the cause of matter flow
What causes flow of matter by diffusion ** Answ** concentration gradient
From a thermodynamic perspective, diffusion is driven by ______ ** Answ** gibbs
free energy gradient
the gibbs free energy gradient is the primary driver of diffusion, but what is meant by
gibbs free energy gradient? ** Answ** maximum reversible work that can be done
by a system at constant T and P
The change in Gibbs Free energy is equal to the: ** Answ** work done by the
system to its surrounding minus the work of the pressure forces
materials engineers consider gibbs free energy to predict the direction of a reaction if
two conditions are specified. These conditions are: ** Answ** temperature, pressure
If the Gibbs free energy of a process is determined to be positive, then the reaction will
_____ ** Answ** not occur spontaneously
Which equation best describes the Arrhenius relationship ** Answ** y=A exp(-B/KT)
How many experimental test are needed to get the first preliminary estimate for B in the
Arrhenius equation? ** Answ** 2 (2 points define a line)
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____ ** Answ** taking logs and plotting the results
What parameters are obtained by taking the logs and plotting the results of the
Arrhenius equation? ** Answ** the value of C(y intercept), Activation energy of the
system Q(from slope)
The Maxwell-Boltzmann Distribution specifies the _____ of finding a molecule at an
energy delta-E greater than the average energy of particles at a particular _____ **
Answ** probability, temperature
True or False: The form of the Maxwell-Boltzmann Distribution follows an Arrhenius type
relationship ** Answ** true
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, In the Maxwell-Boltzmann Distribution, what fundamentally occurs as T increases
according to this relationship? ** Answ** a larger number of particles are available to
overcome a given energy barrier q.
When a process can be described by an Arrhenius relationship, if you know the
activation energy, then you can find the ______ ** Answ** process
What conclusion would you draw if you know that multiple processes are occurring
simultaneously, each with its own activation energy, but one of these activation energies
is representative of the observed experimental data. ** Answ** a single process is
dominant
What of the following cause point defects in crystals ** Answ** thermal vibration
When your lab assistant tells you the temperature of a given material is T, what does
this mean? ** Answ** The AVERAGE temperature of the molecules in the material
have temperature T
What do these two curves (one at T1 and one at T2) show? Shown is T1 with higher
peak and lower tail, and T2 with lower and delayed peak with higher curve ** Answ**
Maxwell-Boltzmann distribution
Which of the factors listed is most closely associated with increasing the probability of
generating point defects in a crystal material? ** Answ** Increasing temperature
Compared to liquids, the activation energy required for diffusion in solids is ** Answ**
greater
point defects in crystals are important for diffusion because they enable the mechanism
of _______ ** Answ** vacancy migration
vacancy migration is an important mechanism by which diffusion can occur because
these vacancies _____ ** Answ** reduce the activation energy for diffusion
What is the basis for development of the equations of diffusion ** Answ** law of
conservation of mass
The law of conservation of mass is central to the development of diffusion relationships.
This law states that the total mass of the products must always equal the ____ **
Answ** total mass of the reactants
what is this equation and why is it important: del J= -del rho/del t ** Answ**
continuity equation, basis for diffusion equations
What are the units of flux of matter? ** Answ** moles/cm^2/second
For assistance with assignments contact
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. ** Answ** false
What is the key difference between bulk flow of a material and diffusion flow of a
material ** Answ** the cause of matter flow
What causes flow of matter by diffusion ** Answ** concentration gradient
From a thermodynamic perspective, diffusion is driven by ______ ** Answ** gibbs
free energy gradient
the gibbs free energy gradient is the primary driver of diffusion, but what is meant by
gibbs free energy gradient? ** Answ** maximum reversible work that can be done
by a system at constant T and P
The change in Gibbs Free energy is equal to the: ** Answ** work done by the
system to its surrounding minus the work of the pressure forces
materials engineers consider gibbs free energy to predict the direction of a reaction if
two conditions are specified. These conditions are: ** Answ** temperature, pressure
If the Gibbs free energy of a process is determined to be positive, then the reaction will
_____ ** Answ** not occur spontaneously
Which equation best describes the Arrhenius relationship ** Answ** y=A exp(-B/KT)
How many experimental test are needed to get the first preliminary estimate for B in the
Arrhenius equation? ** Answ** 2 (2 points define a line)
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____ ** Answ** taking logs and plotting the results
What parameters are obtained by taking the logs and plotting the results of the
Arrhenius equation? ** Answ** the value of C(y intercept), Activation energy of the
system Q(from slope)
The Maxwell-Boltzmann Distribution specifies the _____ of finding a molecule at an
energy delta-E greater than the average energy of particles at a particular _____ **
Answ** probability, temperature
True or False: The form of the Maxwell-Boltzmann Distribution follows an Arrhenius type
relationship ** Answ** true
For assistance with assignments contact
, In the Maxwell-Boltzmann Distribution, what fundamentally occurs as T increases
according to this relationship? ** Answ** a larger number of particles are available to
overcome a given energy barrier q.
When a process can be described by an Arrhenius relationship, if you know the
activation energy, then you can find the ______ ** Answ** process
What conclusion would you draw if you know that multiple processes are occurring
simultaneously, each with its own activation energy, but one of these activation energies
is representative of the observed experimental data. ** Answ** a single process is
dominant
What of the following cause point defects in crystals ** Answ** thermal vibration
When your lab assistant tells you the temperature of a given material is T, what does
this mean? ** Answ** The AVERAGE temperature of the molecules in the material
have temperature T
What do these two curves (one at T1 and one at T2) show? Shown is T1 with higher
peak and lower tail, and T2 with lower and delayed peak with higher curve ** Answ**
Maxwell-Boltzmann distribution
Which of the factors listed is most closely associated with increasing the probability of
generating point defects in a crystal material? ** Answ** Increasing temperature
Compared to liquids, the activation energy required for diffusion in solids is ** Answ**
greater
point defects in crystals are important for diffusion because they enable the mechanism
of _______ ** Answ** vacancy migration
vacancy migration is an important mechanism by which diffusion can occur because
these vacancies _____ ** Answ** reduce the activation energy for diffusion
What is the basis for development of the equations of diffusion ** Answ** law of
conservation of mass
The law of conservation of mass is central to the development of diffusion relationships.
This law states that the total mass of the products must always equal the ____ **
Answ** total mass of the reactants
what is this equation and why is it important: del J= -del rho/del t ** Answ**
continuity equation, basis for diffusion equations
What are the units of flux of matter? ** Answ** moles/cm^2/second
For assistance with assignments contact
