When a chemical change occurs: A) the law of conservation of mass is always obeyed
B) the chemical properties of new substances are different from the ones you started with
C) all of the options are true
D) atoms are rearranged

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

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released

What happens after sound waves create vibrations in the ear?