ENCN281 Exam Questions with 100% Correct Answers 2024/2025
8 views 0 purchase
Course
ENCN281
Institution
ENCN281
ENCN281 Exam Questions with 100% Correct Answers 2024/2025
What is the Slope of a Zeroth-Order Reaction? - ANSWERSLinear with respect to concentration (C).
What is the Slope of a First-Order Reaction? - ANSWERSLinear with respect to natural logarithm of concentration (ln(C)).
What is the...
ENCN281 Exam Questions with 100%
Correct Answers 2024/2025
What is the Slope of a Zeroth-Order Reaction? - ANSWERSLinear with respect to concentration (C).
What is the Slope of a First-Order Reaction? - ANSWERSLinear with respect to natural logarithm of
concentration (ln(C)).
What is the Slope of a Second-Order Reaction? - ANSWERSLinear with respect to 1/concentration (1/C).
Main Principle of Mass Balances - ANSWERSConservation of mass.
Characteristics of a Conservative Substance - ANSWERSDoes not undergo chemical reactions.
Characteristics of a Steady State Substance - ANSWERSNo accumulation over time.
Characteristics of Ideal Reactors - ANSWERSUniform flow, uniform mixing, no rate or spatial variation.
Examples of Spatial Variations in a CMFR - ANSWERSBy-pass, dead-zone, recirculation.
Examples of Spatial Variations in a PFR - ANSWERSAxial dispersion, back-mixing.
Characteristics of Batch Reactors - ANSWERSNo inflow or outflow during reaction.
What is the characteristic of a Plug Flow Reactor (PFR)? - ANSWERSParticles pass through and exit in the
same relative position/sequence.
Provide an example of a PFR. - ANSWERSLong narrow rivers and drinking water pipes.
, What is true for Completely Mixed Flow Reactors (CMFR) and what assumption can be made? -
ANSWERSParticles entering are instantly dispersed with continuous inputs and outputs, hence assume
steady state.
Give an example of a CMFR. - ANSWERSReservoirs and lakes.
What are the differences between a PFR and a CMFR for an identical flow rate k in a first-order process? -
ANSWERSPFR requires a smaller volume to achieve the same conversion rate.
How can a non-steady state CMFR be modeled? - ANSWERSUsing a conservative tracer to track
movement in the reactor.
What are the characteristics of non-ideal reactors? - ANSWERSNon-uniform flow, insufficient mixing,
spatial variations.
What does the Residence Time Distribution (RTD) model and what is its diagnostic use? - ANSWERSIt
measures the time particles/fluid spend in a reactor and is used to diagnose non-ideal reactors.
For which type of reactors is the dispersion model used? - ANSWERSNon-ideal reactors.
In the dispersion model, what does a large D value indicate? - ANSWERSCompletely Mixed Flow Reactor
(CMFR).
What does a small D value indicate in the dispersion model? - ANSWERSPlug Flow Reactor (PFR)
For what type of reactors is the n-tanks in series model used? - ANSWERSNon-ideal reactors
What does a small N value signify in the n-tanks in series model? - ANSWERSComplete Mix Flow Reactor
(CMFR)
What does a large N value indicate in the n-tanks in series model? - ANSWERSPlug Flow Reactor (PFR)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Bensuda. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
