Most nitrogen leaching to groundwater is in the form of ammonium
Indicate whether the statement is true or false
FALSE
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In warm weather, concrete block should not be laid on the footing until _____ have/has passed.
A. two weeks B. one week C. 3 days D. 48 hours
What is the minimum efficiency of a fossil fuel–burning furnace?
What will be an ideal response?
Which of the following is a correct analysis of the isothermal reactor, compared to the adiabatic reactor?
A feed stream of 50 mol% A and 50 mol% B at 500 K enter an adiabatic steady state reactor. The reaction is A + B ? C and occurs in the liquid phase. The stream leaving the reactor is at 545 K, and is at equilibrium. An engineer proposes adding temperature control to the reactor, so that it is instead an isothermal reactor at 500 K A. The reaction will be slower in the isothermal reactor, but the effect on the extent of reaction at equilibrium cannot be determined. B. The reaction will be slower in the isothermal reactor, and the extent of reaction at equilibrium will be lower than in the adiabatic reactor. C. The reaction will be slower in the isothermal reactor, but if the reaction reaches equilibrium, the extent of reaction will be higher than in the adiabatic reactor. D. It is unrealistic for a reaction to occur in the liquid phase at temperatures of 500 K and above. E. None of the above are accurate.
What may the Prius gas engine do at a stop or very low speeds to conserve fuel?
A. stay at idle B. shut off C. drop off one cylinder D. drop off two cylinders