How is the way water cools different from other liquids ?

Calculate the number of molecules present in 0.750 mol of mgo.

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions