How many atoms of nitrogen (N) would be in a 10.5 g sample of nitrogen (N)?

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

The limiting reactant(s) appeared to be

When casey looks at a cd or dvd she notices that there is a rainbow pattern that is created by the light. she became curious and shone light directly at it and a pattern was created on the wall. what is the cause of this pattern?