Mass Transfer
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

Flash
Molecular
Azeotropic
Extractive

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Mass Transfer
Blowdown in a cooling tower

Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
All of these
Is undesirable
Increases the scale forming tendencies of water

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Mass Transfer
Molecular diffusion is caused by the

Potential energy of the molecules
Activation energy of the molecules
Thermal energy of the molecules
Transfer of molecules from low concentration to high concentration region

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