## What is the phenomenon being explained?

Anaïs said farewell to her favorite uncle as he boarded a plane for Paris. That night she dreamed that he was flying in a jetliner that suddenly ran into a powerful thunderstorm and extreme turbulence. The plane rocked from side to side, then descended rapidly into the night. The jetliner crashed into a mountain, killing all onboard. When she awoke the next day, she learned that her uncle’s plane had encountered violent turbulence on the way to Paris and that several passengers, including her uncle, had been injured during the flight. She had just had one of those rare experiences known as a prophetic dream.

1. What is the phenomenon being explained?

2. What theories are given to explain the phenomenon? (Some theories may be unstated.)

3. Which theory seems the most plausible and why? (Use the criteria of adequacy.)

4. Which theory is the least plausible and why?

5. Regarding the most credible theory, what factors would convince you to regard it as even more plausible?

6. Regarding the least credible theory, what factors would convince you to regard it as much more plausible?

### Determine the outlet concentration x1 in the water solution and in the trichloroethane solution using an analytical equation.

Predicting Extraction for an Existing Tower with a Given Number of Steps. An existing tower contains 5.0 theoretical steps. It is desired to predict its performance under the following conditions….

### Calculate the minimum solvent that can be used. [Hint: In this case, the tie line through the feed L0 represents the condition for minimum solvent flow rate.

Minimum Solvent and Countercurrent Extraction of Acetone. An aqueous feed solution of 1000 kg/h containing 23.5 wt % acetone and 76.5 wt % water is being extracted in a countercurrent….

### Determine the break-point time, the fraction of total capacity used up to the break point, the length of the unused bed, and the saturation loading capacity of the solid.

Drying of Nitrogen and Scale-Up of a Column. Using molecular sieves, water vapor was removed from nitrogen gas in a packed bed (C1) at 28.3°C. The column height was 0.268….