Reaction Rates and Interfacial Chemical Reactions
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Questions and Answers

Which type of reaction model is being discussed in this section?

  • Shrinking Particle Model (correct)
  • Reaction System Model
  • Multiple Particle Model
  • Diffusional Transport Model

    • In the Shrinking Particle Model, what happens to the particle size as the reaction proceeds?

  • The particle size remains constant
  • The particle size becomes infinite
  • The particle size increases
  • The particle size decreases (correct)

    • Which of the following reactions is an example of the Shrinking Particle Model?

  • Combustion of fuels
  • Oxidation of organic compounds
  • Polymerization reactions
  • Dissolution of metals/metal compounds (correct)

    • According to the text, which of the following is assumed in the Shrinking Core Model?

    <p>Isothermal conditions</p> Signup and view all the answers

    What controls the rate of reaction in the External Mass Transfer Controls?

    <p>External mass transport through the boundary layer</p> Signup and view all the answers

    What is the rate of disappearance of B (-dnB) proportional to in the Shrinking Core Model?

    <p>The decrease in volume of unreacted core (-dV)</p> Signup and view all the answers

    What is the rate of reaction constant in the Diffusion Through Product / Ash Layer Controls?

    <p>The rate of diffusion to the reaction surface</p> Signup and view all the answers

    According to the text, which factor determines the rate expression of a reaction?

    <p>The shape of the particle</p> Signup and view all the answers

    In the case where no solid product is formed and diffusion offers no resistance, how is the overall reaction influenced?

    <p>Pore diffusion</p> Signup and view all the answers

    In the grain model of reaction modeling, which assumption is valid for determining the concentration profile of the fluid reactant within the solid?

    <p>The pseudo-steady-state approximation</p> Signup and view all the answers

    Which of the following is the correct way to write the equation for a line in slope-intercept form?

    <p>$y = mx + b$</p> Signup and view all the answers

    What is the solution to the mass balance equation for a single porous particle with no solid product formed?

    <p>$\frac{d^2C_b}{dx^2} - k_sSV C_b^n = 0$</p> Signup and view all the answers

    Which of the following is the formula for finding the area of a rectangle?

    <p>$A = lw$</p> Signup and view all the answers

    Which of the following is the formula for finding the circumference of a circle?

    <p>$C = 2\pi r$</p> Signup and view all the answers

    Which of the following is the formula for finding the area of a triangle?

    <p>$A = \frac{1},{2}bh$</p> Signup and view all the answers

    Which of the following is the formula for finding the volume of a cylinder?

    <p>$V = \pi r^2h$</p> Signup and view all the answers

    Which type of reactor is operated continuously and assumes perfect mixing throughout the reactor volume?

    <p>CSTR</p> Signup and view all the answers

    Which equation represents Fick's 2nd Law?

    <p>$𝐷𝑒 ∇2 𝐶𝑏 − 𝜈𝐴 = 0$</p> Signup and view all the answers

    Which equation represents the mass balance for solid reactant B within each solid grain?

    <p>$−𝜌𝐵 𝑑𝑟𝑐 𝑑𝑡 = 𝑏𝑘𝑠 𝐶𝑏$</p> Signup and view all the answers

    Which equation represents the relationship between time and conversion?

    <p>$𝑡 ∗ ≃ 𝑔𝐹𝑔 (𝑥) + 𝜎 2 𝑝𝐹𝑝 (𝑥)$</p> Signup and view all the answers

    Which equation represents the macro mass balance equation for reaction engineering?

    <p>$V \frac{dVC_A},{dt} = FiCA_i - FoCA_o + \int r_A dV$</p> Signup and view all the answers

    What is the design equation for a continuously stirred tank reactor (CSTR) at steady-state?

    <p>$V = F(CAi - CAo) - rA$</p> Signup and view all the answers

    What is the design equation for a plug flow reactor (PFR) at steady-state?

    <p>$V \frac{dVC_A},{dt} = 0$</p> Signup and view all the answers

    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?

    <p>Lower</p> Signup and view all the answers

    Which of the following is the basic equation for reaction engineering?

    <p>$V \frac{dVCA},{dt} = FiCAi - FoCAo + \int rA dV$</p> Signup and view all the answers

    Which reactor type has a reaction rate that varies in the axial direction?

    <p>Plug flow reactor</p> Signup and view all the answers

    What is the design equation for a plug flow reactor?

    <p>$V = F(CAi - CAo) - rA$</p> Signup and view all the answers

    Which reactor type requires a lower required space time or residence time to reach the same output concentration?

    <p>Plug flow reactor</p> Signup and view all the answers

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