assuming the question is 2. you add a prefix to the base unit, it shows it right there. Depending on how much larger or smaller the prefix changes from mega-micro.
False. It is a physical change because the molecules of the bread didn't change only the form of the bread changed.
B. A mole is the molar mass in 1 liter. So 2 m needs 2 moles in 1 liter.