In a chemical reaction, which event ALWAYS occurs as the reaction proceeds?

A. the rearrangement of electrons to break or form chemical bonds
B. the release of energy to the environment
C. the absorption of energy from the environment
D. a change in total mass

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