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1. The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that
(A): a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime
(B): A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate
(C): as the stirrer speed increases, the liquid will continue to circulate and then become turbulent
(D): as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
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