In liquids and gasses, diffusion arises from molecular interactions.
Answer: True
Transport
- If the Peclet number is greater than 1, convection dominates.
- If the Reynolds number is greater than 1, inertial forces dominate.
- The quasi-steady-state assumption is used when the time for the reactant to undergo reaction is much faster than the time to form a reactant.
- The reaction stoichiometry relates the reaction rates of reactants and products.
- In a diffusion limited reaction, the limiting step for a chemical reaction to occur is the orientation of the molecules when they come in contact.
- In a reversible reaction, the order of the forward reaction and reverse reaction are always of the same order.
- In first order reactions, the concentration disappears exponentially in time.
- The units of the rate coefficient depend on the order of the reaction.
- The rate coefficient depends on the concentration of reactants and products.
- Heterogeneous reactions occur at an interface and the reaction rates appear in the boundary conditions.
- Homogenous reactions occur throughout a single phase and the reaction rates appear in the diffusion equation.
- Reaction rates represent the amount of reactant consumed or product produced per unit area per unit time.
- Random coils can adopt a number of configurations, and the root mean squared end to end distance can be described in terms of a modified random walk.
- Water that is firmly associated with the protein increase the size of the molecules altering the frictional coefficient.
- The frictional coefficient cannot be determined from the particle sedimentation rates.
- For a sphere of radius R, the friction coefficient is proportional to the radius of the sphere.
- For low Reynolds number flow, the drag force on the molecule is proportional to the particle velocity.
- In Brownian motion, the region of space that is sampled by the diffusing molecules grows with time.
- The mean displacement of N particles is proportional to the size of the particles.
- Solute equilibrium at the interface between two immiscible fluids states that the concentration is the same.
- Fick's first law states that the diffusive flux of a dissolved solute equals the negative product of the diffusion coefficient and the concentration gradient.
- When convection is present, the following equation is true. Ni = -Dij(grad)Ci + Ci*vs.
- If a chemical reaction occurs at a surface, then the flux to the surface equals the rate of reaction.
- If your boundary condition is impermeable, there is no flux across it.