Which description is an example of gravitational potential energy transforming into kinetic energy? a. water flowing downhill and spinning turbines b. upward currents of wind spinning blades of a windmill c. plants performing photosynthesis d. loudspeakers producing sound from electrical signals

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

How many neutrons does an element have if its atomic number is 50 and its mass number is 166

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