This project is funded by the National Science Foundation and the Department of Chemical and Biological Engineering at the University of Colorado-Boulder with support from Shell and the Engineering Excellence Fund at CU-Boulder. Its goal is to provide ConcepTests (clicker-based questions) and video ScreenCasts for the following core chemical engineering courses:

(Posted - Highlight top menu bar)
Separations & Mass Transfer
Kinetics/Reactor Design
(In Progress - check menu bar)
Materials & Energy Balances
(In Progress - check menu bar)
Heat Transfer

Students/Visitors: Use the tab above to access the ScreenCasts.

Faculty/Members: Sign up to access the ConcepTests tabs.


ConcepTests challenge students with qualitative questions that are not answered by memorization. Studies (listed on ConcepTests main page) show that ConcepTests and Peer instruction can dramatically improve functional understanding. Furthermore, instructors can gauge students understanding immediately and tailor their instruction accordingly. Three examples of ConcepTests are provided below.


ScreenCasts, which are short screen captures of material with narration by an instructor, typically written on a Tablet PC, are videos that students view outside of class. The videos can detail problem solutions, mini-lectures of material not covered in class, or software tutorials. These videos provide learners with alternatives to lecture notes and textbooks. These can also act to teach students a systematic method for solving engineering problems. Below is an example ScreenCast.

Material & Energy Balances

A perfectly-insulated rigid vessel initially contains two reactive gas-phase components. An explosive reaction consumes all the reactants. The total internal energy of the gas ________.

  1. increases
  2. decreases
  3. stays the same
  4. Not enough information

Example Screencast for Hess's Law
Separations & Mass Transfer

Water is separated from methanol in a flash drum at fixed temperature. At a pressure of 2 atm, the vapor phase contains 65% methanol and the liquid phase 40% methanol. If the pressure is increased (but is still below the bubble pressure), the mole fraction of methanol in the two phases _________.

  1. will increase in the vapor and decrease in the liquid
  2. will decrease in the vapor and increase in the liquid
  3. will decrease in both phases
  4. will increase in both phases

Two different paths can be used for a process that changes the state of a fluid from 300 K and 1 bar to 500 K and 9 bar. Path A is adiabatic and reversible, and Path B is nonadiabatic and irreversible. Which of the following statements is true?

  1. Path A will require less work.
  2. The change in entropy for the fluid will be greater for path A.
  3. The change in entropy for the fluid will be greater for path B.
  4. The change in entropy for the fluid will be equal in both paths and > 0.

A brief overview on what ScreenCasts are, how to access them and how to increase the impact they have on your learning process.

Developed at the University of Colorado-Boulder
Department of Chemical and Biological Engineering:

John Falconer: Mel and Virginia Clark Professor, President's Teaching Scholar
Janet DeGrazia: Senior Instructor and Associate Chair
Will Medlin: Associate Professor and ConocoPhillips Faculty Fellow
Garret Nicodemus: Project Assistant, Web-master

Zachary Gibbs: Project Assistant
Audrey Schaiberger: Project Assistant
Michael Holmberg: Project Assistant

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