28 Questions
Which type of reaction model is being discussed in this section?
Shrinking Particle Model
In the Shrinking Particle Model, what happens to the particle size as the reaction proceeds?
The particle size decreases
Which of the following reactions is an example of the Shrinking Particle Model?
Dissolution of metals/metal compounds
According to the text, which of the following is assumed in the Shrinking Core Model?
Isothermal conditions
What controls the rate of reaction in the External Mass Transfer Controls?
External mass transport through the boundary layer
What is the rate of disappearance of B (-dnB) proportional to in the Shrinking Core Model?
The decrease in volume of unreacted core (-dV)
What is the rate of reaction constant in the Diffusion Through Product / Ash Layer Controls?
The rate of diffusion to the reaction surface
According to the text, which factor determines the rate expression of a reaction?
The shape of the particle
In the case where no solid product is formed and diffusion offers no resistance, how is the overall reaction influenced?
Pore diffusion
In the grain model of reaction modeling, which assumption is valid for determining the concentration profile of the fluid reactant within the solid?
The pseudo-steady-state approximation
Which of the following is the correct way to write the equation for a line in slope-intercept form?
$y = mx + b$
What is the solution to the mass balance equation for a single porous particle with no solid product formed?
$\frac{d^2C_b}{dx^2} - k_sSV C_b^n = 0$
Which of the following is the formula for finding the area of a rectangle?
$A = lw$
Which of the following is the formula for finding the circumference of a circle?
$C = 2\pi r$
Which of the following is the formula for finding the area of a triangle?
$A = \frac{1},{2}bh$
Which of the following is the formula for finding the volume of a cylinder?
$V = \pi r^2h$
Which type of reactor is operated continuously and assumes perfect mixing throughout the reactor volume?
CSTR
Which equation represents Fick's 2nd Law?
$𝐷𝑒 ∇2 𝐶𝑏 − 𝜈𝐴 = 0$
Which equation represents the mass balance for solid reactant B within each solid grain?
$−𝜌𝐵 𝑑𝑟𝑐 𝑑𝑡 = 𝑏𝑘𝑠 𝐶𝑏$
Which equation represents the relationship between time and conversion?
$𝑡 ∗ ≃ 𝑔𝐹𝑔 (𝑥) + 𝜎 2 𝑝𝐹𝑝 (𝑥)$
Which equation represents the macro mass balance equation for reaction engineering?
$V \frac{dVC_A},{dt} = FiCA_i - FoCA_o + \int r_A dV$
What is the design equation for a continuously stirred tank reactor (CSTR) at steady-state?
$V = F(CAi - CAo) - rA$
What is the design equation for a plug flow reactor (PFR) at steady-state?
$V \frac{dVC_A},{dt} = 0$
What is the required space time or residence time to reach the same output concentration (CA,o) of a PFR compared to a CSTR for n>0?
Lower
Which of the following is the basic equation for reaction engineering?
$V \frac{dVCA},{dt} = FiCAi - FoCAo + \int rA dV$
Which reactor type has a reaction rate that varies in the axial direction?
Plug flow reactor
What is the design equation for a plug flow reactor?
$V = F(CAi - CAo) - rA$
Which reactor type requires a lower required space time or residence time to reach the same output concentration?
Plug flow reactor
Test your understanding of reaction rates and interfacial chemical reactions with this quiz. Explore how particle shape and external mass transfer influence the rate expression. Challenge yourself with questions on first-order reactions and their rate equations. Get ready to dive into the fascinating world of reaction kinetics!
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