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. mole day B. day1 C. mole2 day D. mole/Liter 1. 2. Which pertains to completely mixed conditions? A. Cin Creactor B. Cout Creactor C. The rate constant for the decomposition of a pollutant is zero 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 Part 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 For a pollutant that undergoes a first order reaction, a requires a shorter hydraulic residence time than a 2. reactor reactor. is the time it takes for a chemical in a reaction to reach 50% 3. Th of e its initial concentration. Eutrophication of fresh surface water concentration of the water. 4. the dissolved oxygen

Explanation / Answer

Ans1) b

Ans2) b

Ans3) d (the concentration of pollutant changes with time and length of reactor in ideal plug flow )

Part 2

Ans1) Steady state

Ans2) The plug flow reactor requires shorter hydraulic residence time as compared to continuous flow stirred tank reactor

Ans3)Half life of a reaction

Ans4)EUTROPHICATION REDUCES THE DISSOLVED OXYGEN CONTENT OF WATER.

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