By: aninacs97 • 1 year ago
By: foodtechaspirant • 1 year ago
By: laurensnikolopoulos33 • 1 year ago
By: chenmingzhang • 3 year ago
By: mettehamers • 3 year ago
Some examples from this set of practice questions
1.
n = 1 [n] * c When do you use this formula and what do the parameters mean?
Answer: To determine the viscosity of a highly diluted solution. [n] = intrinsic viscosity of the biopolymer --> determine with K*M^a c = concentration of the biopolymer
2.
[n] = K*M^a When to use this formula?
Answer: To determine the intrinsic viscosity of a biopolymer so you can use this in an equation to determine the viscosity of a solution.
3.
What does Rh ~ M^b mean?
Answer: This equitation means that the hydrodynamic radius (Rh) depends on the molecular weight (M) and shape of the polymer (b)
4.
What does a higher value for a mean?
Answer: A higher hydrodynamic radius/volume of the polymer --> higher viscosity because larger polymers take more space in solution and thus contribute more to viscosity
5.
Why does a polymer with a larger hydrodynamic volume lead to a higher viscosity?
Answer: Because a large polymer takes more space in solution and thus the contribution to the viscosity is higher.
6.
What is the effect of the pH on the hydrodynamic volume?
Answer: A higher pH (further from IEP) leads to a higher charge density on the molecule. This results in more repulsion between different groups and an increase in hydrodynamic volume. As a result the viscosity will be higher.
7.
What is the effect of ionic strenght on the hydrodynamic volume of the molecule?
Answer: A higher ionic strenght means that more charges are screened. This leads to less repulsion between the different groups --> smaller hydrodynamic volume, lower viscosity
8.
n = 1 [n]*c k*[n]*c^2 When do you use this formula?
Answer: When there is interaction between the polymers, so at higher concentrations.
9.
How do you know when to use simple or longer formula for viscosity of solution?
Answer: Make a graph with viscosity as function of concentration for both formulas. Intersection point is from where you should use second formula.
10.
When does steric stabilization occur?
Answer: In solutions with attractive interactions between particles/droplets and polymers
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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!
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
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.
Stuvia is a marketplace, so you are not buying this document from us, but from seller bsc_msc_food_technology. Stuvia facilitates payment to the seller.
No, you only buy these notes for $3.85. You're not tied to anything after your purchase.
4.6 stars on Google & Trustpilot (+1000 reviews)
98390 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
