Part 1: Multiple choice questions, 3 points each (circle one answer) The correct

Question

Part 1: Multiple choice questions, 3 points each (circle one answer) The correct units of reaction coefficient for a first order reaction rate equation are: A. mole1 day B. day C. mole day D, mole/Liter 1. Which pertains to completely mixed conditions? A. Cin Creactor B. Cout -Creactor C. The rate constant for the decomposition of a pollutant is zero 2. 3. The concentration of pollutant subject to first order reaction in a plug flow reactor changes as a function of A. Reaction time B. Reactor length C. Reactor diameter D. Options A and B E. Options A and C rt 2: Fill in the blank, 4 points each 1. In a mass balance problem, the situation where the rate of accumulation (dC/dt) is zero is referred to as 2. For a pollutant that undergoes a first order reaction, a requires a shorter hydraulic residence time thana reactor reactor 3. The is the time it takes for a chemical in a reaction to reach 50% of its initial concentration. Eutrophication of fresh surface water concentration of the water 4. the dissolved oxygen

Explanation / Answer

1.. B... (day)^-1

2... Completely mixed reactor subjects to steady state condition ... so, Its D. Qin = Qout

3.... C reactor diameter.

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