# Top-rated ScreenCasts

Text Section | Link to original post | Rating (out of 100) | Number of votes | Copy of rated post |
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10.01 - Introduction to Phase Diagrams | Click here. | 84 | 5 |
Bubble, Dew, Flash Concepts and the Lever Rule (4:01) (msu.edu) Understanding what is present (known) and not present (unkown) for a given state of a system will help you decide which routine to use. Notation is introduced for liquids, vapor, and overall compositions. Also, the lever rule concept is used throughout the chemical engineering curriculum, but it is important to see how to use compositions for the lever rule. Comprehension Questions: 1. Which variables are fixed and which do you need to find in each of the following: |

13.05 - UNIFAC | Click here. | 82.8571 | 7 |
Unifac.xls Calculation of Bubble Temperature. (3 min) (LearnChemE.com) |

07.06 Solving The Cubic EOS for Z | Click here. | 82.8571 | 7 |
3. Using Preos.xlsx and Interpreting Output (11:38) (msu.edu) Comprehension Questions: 1. Is it possible to have a 1-root region below the critical temperature? 2. Is it possible to have a 3-root region above the critical temperature? 3. How does fugacity help us to identify the proper root to select? 4. Would argon at 5 MPa be in the 1-root or 3-root region? |

18.09 - Sillen Diagram Solution Method | Click here. | 80 | 1 |
Sillen Diagram for Electrolyte Calculations (10:14) (msu.edu)
Construction of a Sillien diagram involves several steps that are hard to follow from a textbook. This screencast goes through the steps of solving Example 18.5 from the Elliott and Lira textbook using the Sillen diagram. The problem asks for the pH of a solution that is 0.01 M NaOAc. |

11.13 - Osmotic Pressure | Click here. | 80 | 3 |
MW of protein by osmotic pressure - (8:23) (learncheme.com) An application of osmotic pressure measurement to determine MW of a protein. |

09.05 - Fugacity and Fugacity Coefficient | Click here. | 80 | 2 |
What is fugacity? (10min) (learncheme.com) Defines fugacity in terms of Gibbs Energy and describes the need for defining this new property as a generalization of how pressure affects ideal gases. |

12.07 Multicomponent Extensions of van Der Waals' Models | Click here. | 80 | 1 |
M1/MAB Extension of the Multicomponent Flash Spreadsheet (19min, uakron.edu) adapted from Ideal Solutions (cf Section 10.4) Shows how to modify the spreadsheet created for Ideal Solutions (Section 10.4) to apply modified Raoult's law for 5 components using the M1/MAB model. Note: This is a companion file in a series. You may wish to choose your own order for viewing them. For example, you should implement the first three videos before implementing this one. Also, you might like to see how to quickly visualize the Txy analog of the Pxy phase diagram. If you see a phase diagram like the ones in section 11.8, you might want to learn about LLE phase diagrams. The links on the software tutorial present a summary of the techniques to be implemented throughout Unit3 in a quick access format that is more compact than what is presented elsewhere. Some students may find it helpful to refer to this compact list when they find themselves "not being able to find the forest because of all the trees." Comprehension Questions: |

13.03 - NTRL | Click here. | 80 | 1 |
NRTL concepts (2:30) (msu.edu) The concepts on the development of the NRTL activity coefficient model. Comprehension Questions: 1. What value does the NRTL model assume for the coordination number (z)? |

09.05 - Fugacity and Fugacity Coefficient | Click here. | 80 | 2 |
In a contest for "the most hated word in Chemical Engineering," Comprehension Questions: 1.What is the fugacity of a vapor phase component in a mixture according to Raoult's law? |

13.04 - UNIQUAC | Click here. | 80 | 4 |
UNIQUAC concepts (6:44) (msu.edu) Concepts and assumptions used in developing the UNIQUAC activity coefficient method. This method introduced the use of surface area as an important quantity in calculation of activity coefficients. |