CHEE 460 Final - Term Project UPDATED ACTUAL Questions and CORRECT Answers
1 view 0 purchase
Course
CHEE 460
Institution
CHEE 460
CHEE 460 Final - Term Project UPDATED
ACTUAL Questions and CORRECT
Answers
Which are the three main mechanisms of detergency? - CORRECT ANSWER- Roll-up
(complete removal of stains)
Emulsification (necking, incomplete removal)
Stain solubilization (slow and progressive)
What is dry water? ...
CHEE 460 Final - Term Project UPDATED
ACTUAL Questions and CORRECT
Answers
Which are the three main mechanisms of detergency? - CORRECT ANSWER✔✔- Roll-up
(complete removal of stains)
Emulsification (necking, incomplete removal)
Stain solubilization (slow and progressive)
What is dry water? What are the two main ingredients of dry water? - CORRECT
ANSWER✔✔- A water-in-air emulsion of 98% by wt water and remainder silica.
Name three of the main ingredients found in latex paints. Explain in words the mechanism by
which EcoPaint could clean the air from noxious gases. - CORRECT ANSWER✔✔-
Pigment, binders, and solvents.
Addition of photocatalysts (TiO2) which prevents production of NOx.
What are the three components of microfluidic devices? - CORRECT ANSWER✔✔-
Actuators, Sensors, Circuits.
What are the advantages of PDMS in microfluidic channels? - CORRECT ANSWER✔✔-
Biocompatibility, transparency, fabrication, chemically inert.
How do you hydrophilize PDMS? What does this achieve? How do we keep PDMS
hydrophilized? - CORRECT ANSWER✔✔- Oxygen plasma treatment: Temporarily
hydrophilic by exposure to plasma. Keep through HEMA grafting.
Explain hydrophobic recovery of PDMS. What's the driving force behind hydrophobic
recovery of PDMS? - CORRECT ANSWER✔✔- PDMS returns to hydrophobic state after
being hydrophilized. Occurs through thermodynamic favourability.
What is PDMS? What's it used for? - CORRECT ANSWER✔✔- An inert polymer used in
microfluidics.
, What are the four phases of ice cream? - CORRECT ANSWER✔✔- Serum phase, air
bubbles, fat globules, ice crystals.
What are important ingredients in ice cream? - CORRECT ANSWER✔✔- Emulsifiers,
Stabilizers, Milk-Solids-Not-Fat
On a colloidal level, describe ice cream's emsulsification. - CORRECT ANSWER✔✔- Air
and ice crystals dispersed in a serum phase.
What are three key steps in manufacturing ice cream? - CORRECT ANSWER✔✔-
Homogenization, freezing, and aging.
What are the purpose of stabilizers in ice cream? - CORRECT ANSWER✔✔- Keep form of
ice cream by trapping air bubbles into serum. Increase viscosity and help limit ice
recrystallization.
Why is ice cream a foam? Why is it an emulsion? - CORRECT ANSWER✔✔- Emulsion:
contains ice crystals in the dispersed phase
Foam: contains air bubbles dispersed in continuous serum phase.
What are tailing ponds? What are the main components? - CORRECT ANSWER✔✔-
Storage of oil sand tailings: liquid residue containing water, sand, clay, and bitumen.
What are three classes of water-soluble polymers? - CORRECT ANSWER✔✔-
Polyacrylamide Flocculants
Inorganic-Organic Hybrid Flocculants
Temperature-Sensitive Polymer Flocculants
What are the issues with Tailing Ponds? - CORRECT ANSWER✔✔- Takes decades for
sediment to settle, significant environmental and health effects.
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 MGRADES. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
