Why amorphous solids are called super cooled liquids?

How many atoms are there in 5.70 mol of mg

How many moles does 80.0 h2o respresent

Achemist reacted 57.50 grams of sodium metal with an excess amount of chlorine gas. the chemical reaction that occurred is shown. na + cl2 ? nacl if the percentage yield of the reaction is 86%, what is the actual yield? show your work, including the use of stoichiometric calculations and conversion factors.