In the city of the last question, on another day the inversion height is 0.5 km. the other parameters (source rate, residence time) for oxides of nitrogen (nox) do not change, because people drive as much as they usually do and there are no changes to nox chemistry that would change the residence time. if the previous case resulted in a concentration of 48 μg/m3 with an inversion height of 1 km, what is the concentration on this new day?

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices